17 datasets found
  1. a

    Delaware Census 2020

    • hub.arcgis.com
    • de-firstmap-delaware.hub.arcgis.com
    Updated Mar 1, 2023
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    State of Delaware (2023). Delaware Census 2020 [Dataset]. https://hub.arcgis.com/maps/58bbc1f460ca4e2ab96d43f9308924ca
    Explore at:
    Dataset updated
    Mar 1, 2023
    Dataset authored and provided by
    State of Delaware
    Area covered
    Description

    Census tracts are small, relatively permanent statistical subdivisions of a county or equivalent entity, and were defined by local participants as part of the 2020 Census Participant Statistical Areas Program. The Census Bureau delineated the census tracts in situations where no local participant existed or where all the potential participants declined to participate. The primary purpose of census tracts is to provide a stable set of geographic units for the presentation of census data and comparison back to previous decennial censuses. Block Groups (BGs) are clusters of blocks within the same census tract. Each census tract contains at least one BG, and BGs are uniquely numbered within census tracts. BGs have a valid code range of 0 through 9. BGs have the same first digit of their 4-digit census block number from the same decennial census. Census blocks are relatively small in area; for example, a block in a city bounded by streets. However, census blocks in remote areas are often large and irregular and may even be many square miles in area. After each decennial census, the Census Bureau delineates urban areas that represent densely developed territory, encompassing residential, commercial, and other nonresidential urban land uses. In general, this territory consists of areas of high population density and urban land use resulting in a representation of the urban footprint.

  2. a

    Delaware Health Care 2.0

    • de-firstmap-delaware.hub.arcgis.com
    • arc-gis-hub-home-arcgishub.hub.arcgis.com
    Updated Sep 16, 2021
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    State of Delaware (2021). Delaware Health Care 2.0 [Dataset]. https://de-firstmap-delaware.hub.arcgis.com/maps/3a70ca809c2942ca97b8219004b68910
    Explore at:
    Dataset updated
    Sep 16, 2021
    Dataset authored and provided by
    State of Delaware
    Area covered
    Description

    Locations for Hospitals, Assisted Living and Nursing Homes.

  3. a

    Delaware 1954 Imagery

    • de-firstmap-delaware.hub.arcgis.com
    Updated Aug 31, 2020
    + more versions
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    State of Delaware (2020). Delaware 1954 Imagery [Dataset]. https://de-firstmap-delaware.hub.arcgis.com/datasets/661bcbe189ea4e1c84542d73bd95a0a4
    Explore at:
    Dataset updated
    Aug 31, 2020
    Dataset authored and provided by
    State of Delaware
    Area covered
    Description

    Resolution: 1.0 Meter Band: 1-band: Panchromatic USDA Agricultural and Commodity Stabilization Service Black and White Scanned and georectified using ERDAS Imagine Flying height 40,000 feet, 6-inch focal length camera SRS: NAD83 HARN Delaware State Plane meters Scale: 1:20,000 These are scanned images from aerial photography flown in 1954 by the Agricultural Stabilization and Conservation Service. The images are presented as a statewide mosaic. This aerial photography was scanned and georectified to provide a historic look at Delaware. Scanning The original, paper format, 9x9" aerial photographs were taken in 1954 as part of an aerial survey program. The photographs were scanned at 300 dpi on an 11x17" EPSON GT-15000 scanner, as multi-band, RGB color images. The output was written to *.JPG files. The eastern half of Sussex County, however, was scanned as single-band, gray scale images, and the output was written to *.TIF files. Correcting for this data mismatch is described in the mosaicking section. Georectifying All georectifying was completed in ERDAS Imagine 8.7. Please see the included tutorial for a more detailed explanation. This document was used for training and reference by staff members completing the processing. 1. Ground control points (GCPs) were created on the 1954 images using the 2002 digital orthophotography of Delaware as a reference, using the Image Geometric Correction Tool. The 2002 data was produced in False Color Infrared at a scale of 1:2,400 with a 1 foot pixel resolution. This data is also available in a single, mosaicked MrSID file and is assigned a State Plane Coordinate System and a North American Datum of 1983. In eastern Sussex County, every attempt was made to create GCPs at a standard scale of 1:3,000, however, due to photo quality this scale was not always possible. For the remainder of the state, the largest scale possible was used while still maintaining a clear, unpixelated image on the screen. 2. The scanned images were then resampled to those points using the Display Resample Image Dialog. 3. The GCPs were stored for each image tile along with the Control Point Error from the registration process. 4. Resampled images (1954 corrected) were subsetted (i.e. cropped) to remove photograph borders, fiducial marks, and distorted edges. Mosaicking The 1954 aerial mosaic was created using ERDAS Imagine 8.7. Before the mosaic could be created, each multi-band image was reduced to a single band gray scale image, because the eastern half of Sussex County was georectified by another processor using images that were scanned as single-band, gray scale images. This was performed using ERDAS Imagine's layer stacking tool to create a new set of images containing only their first band. Once this new set of images was created the mosaic of the entire state could be processed. To complete this task, the mosaic tool from ERDAS Imagine was used and contained a feather technique for blending overlapping images. Holes in the final image of Delaware are due to misplacement of aerial photographs.

  4. 2023 Cartographic Boundary File (KML), Block Group for Delaware, 1:500,000

    • catalog.data.gov
    • s.cnmilf.com
    Updated May 16, 2024
    + more versions
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    2023 Cartographic Boundary File (KML), Block Group for Delaware, 1:500,000 [Dataset]. https://catalog.data.gov/dataset/2023-cartographic-boundary-file-kml-block-group-for-delaware-1-500000
    Explore at:
    Dataset updated
    May 16, 2024
    Dataset provided by
    United States Census Bureauhttp://census.gov/
    Area covered
    Delaware 1
    Description

    The 2023 cartographic boundary KMLs are simplified representations of selected geographic areas from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). These boundary files are specifically designed for small-scale thematic mapping. When possible, generalization is performed with the intent to maintain the hierarchical relationships among geographies and to maintain the alignment of geographies within a file set for a given year. Geographic areas may not align with the same areas from another year. Some geographies are available as nation-based files while others are available only as state-based files. Block Groups (BGs) are clusters of blocks within the same census tract. Each census tract contains at least one BG, and BGs are uniquely numbered within census tracts. BGs have a valid code range of 0 through 9. BGs have the same first digit of their 4-digit census block number from the same decennial census. For example, tabulation blocks numbered 3001, 3002, 3003,.., 3999 within census tract 1210.02 are also within BG 3 within that census tract. BGs coded 0 are intended to only include water area, no land area, and they are generally in territorial seas, coastal water, and Great Lakes water areas. Block groups generally contain between 600 and 3,000 people. A BG usually covers a contiguous area but never crosses county or census tract boundaries. They may, however, cross the boundaries of other geographic entities like county subdivisions, places, urban areas, voting districts, congressional districts, and American Indian / Alaska Native / Native Hawaiian areas. The generalized BG boundaries in this release are based on those that were delineated as part of the Census Bureau's Participant Statistical Areas Program (PSAP) for the 2020 Census.

  5. a

    Delaware Protected Natural Resources 2.0

    • de-firstmap-delaware.hub.arcgis.com
    • hub.arcgis.com
    • +1more
    Updated Sep 23, 2022
    + more versions
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    State of Delaware (2022). Delaware Protected Natural Resources 2.0 [Dataset]. https://de-firstmap-delaware.hub.arcgis.com/maps/93f84280fdb1479eb7a9f1aca94e4ff8
    Explore at:
    Dataset updated
    Sep 23, 2022
    Dataset authored and provided by
    State of Delaware
    Area covered
    Description

    Park Facilities - outdoor recreational facilities throughout DelawareNatural Areas - boundaries for the Natural Areas Inventory statewide for the purpose of achieving voluntary land protection of the most important natural areas in Delaware.Outdoor Recreation, Parks and Trails Program Lands – Lands where Delaware Land & Water Conservation Trust Fund (now the Outdoor Recreation, Parks and Trails Program) monies have been invested.Outdoor Recreation, Parks and Trails Program Open Space - land protected in perpetuity under the Outdoor Recreation, Parks and Trails ProgramLand and Water Conservation Fund – Lands protected under the Land and Water Conservation Fund.Nature Preserves - lands preserved under the Delaware Nature Preserves ProgramOutdoor Recreation Areas - The Outdoor Recreation Inventory (ORI) was originally created to track publicly owned lands within Delaware that are open for public recreation. The database has since been expanded to include all publicly and privately owned protected lands (Federal, State, County, Municipal and private conservation) regardless of whether they are open to the public or not.Public Protected Lands – Outdoor Recreation Areas open to the public.No Build Lines and Points - To ensure that beaches and dunes are able to perform their protective and recreational functions, construction must be kept off them. A Building Line has been established along the coast as part of the Regulations Governing Beach Protection and the Use of Beaches. The Building Line, which parallels the coastline, is designated on DNREC maps. No construction may take place seaward of the Line without a Coastal Construction Permit or Coastal Construction Letter of Approval from the Department of Natural Resources and Environmental Control(DNREC)

  6. d

    DGS Geologic Map No. 8 (Milford-Mispillion River Quadrangles)

    • datadiscoverystudio.org
    Updated Feb 1, 2014
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    K. W. Ramsey (2014). DGS Geologic Map No. 8 (Milford-Mispillion River Quadrangles) [Dataset]. http://datadiscoverystudio.org/geoportal/rest/metadata/item/46c3a2cb7fa3419eb5ca568d77c60ef0/html
    Explore at:
    Dataset updated
    Feb 1, 2014
    Authors
    K. W. Ramsey
    Area covered
    Description

    The vector data set contains the rock unit polygons for the surficial geology for DGS Geologic Map No. 8 (Milford-Mispillion River Quadrangles). The original Geologic Map Description of the published map follows: This map is the first detailed surficial geologic map in southern Kent and northern Sussex counties. Other maps covering the same or adjacent areas have focused on subsurface geology (Benson and Pickett, 1986), hydrogeology (Talley, 1982), or surficial geology on a regional scale (Jordan, 1964; Owens and Denny, 1979; Ramsey and Schenck, (1990). The purpose of this map is to show the distribution of geologic units found at or near the present land surface. These units are composed of the geologic materials that support agriculture and development, are mined for sand and gravel resources, and are the surface-to-subsurface pathway for water. Initial work in the area of Milford assigned surficial deposits to the Pleistocene (Marine and Rasmussen, 1955) without formational designation. Rasmussen et al. (1960) recognized near-surface units just south of Milford to be the Brandywine Formation, the Beaverdam Sand, and the Walston Silt. Jordan (1964, 1974), assigned these units in the map area to the Columbia Formation. Owens and Minard (1979) extended stratigraphic designations recognized in New Jersey into Delaware and mapped the area as Pensauken Formation (roughly equivalent to the Columbia of Jordan, 1964), with a fringe of deposits labeled as Spring Lake and Van Sciver Lake beds adjacent to Delaware Bay. Owens and Denny (1979) presented a different stratigraphy in a regional map showing the Beaverdam Sand as the dominant surficial deposit with a fringe along Delaware Bay of, from west to east, the Omar Formation and the Ironside Formation. Talley (1982) considered the entire area of the Milford Quadrangle to be covered by the Columbia Formation. Ramsey and Schenck (1990) mapped the Columbia Formation as the major surficial deposit with a younger Pleistocene unit along Delaware Bay given the informal designation of Delaware Bay deposits. The suficial units on this map were recognized on their lithologic characteristics and internal stratigraphy from examination of over 600 lithologic logs from water well and test hole borings as well as outcrop information and shallow soil auger borings. The map units were compared to previously named units to determine the stratigraphic nomenclature. The Columbia Formation is retained in the sense of Jordan (1974). Other previously used names were rejected because of lithologic characteristics different from those units found in the map area. This map includes two new lithostratigraphic units, the Lynch Heights Formation and the Scotts Corner Formation. These units are refinements based on additional geologic information about the Delaware Bay deposits of Ramsey and Schenck (1990). Palynological data proved to be useful in support of differentiation of the two units, especially the stratigraphic distribution of Quercus (oak) species (Johan J. Groot, pers. comm.). Interpretations of climate and vegetation based on the palynology are in the adjoining table. The type section for the Scotts is designated as Lf14-p (adjoining figure). Reference sections are designated as Lf23-x, Mf25-a, and MG33-g. The type section for the Lynch Heights Formation is designated as Lf21-19 (adjoining figure). Reference sections are Le14-18, Le25-12, and boring Lf-53-a. Descriptions of reference sections are available from the Delaware Geological Survey (DGS) upon request and will be published along with other data in support of this map as part of a DGS Report of Investigations. Recognition of subsurface units (the Calvert, Choptank and St. Marys formations) is an extension of the work of Benson et al. (1985), Benson and Pickett (1986), Andres (1986), Groot et al. (1990), Benson (1990), and Ramsey and Schenck (1990). Published (Groot, 1992) and unpublished palynostratigraphic data were used as aids in recognition of these units. Distribution of Holocene deposits of swamp, marsh, and beach were mapped on the basis of vegetation observed on aerial photographs and spot checked in the field for accuracy. Mapped areas are not to be used for wetlands designation as they represent distrib ution of lithologies deposited in environments characterized by vegetation rather than the environments themselves. Offshore distribution of bottom sediment type is based on unpublished data from the Delaware Geological Survey as well as data from Marx (1981), Maley (1981), Strom (1972), and Wethe (1984). Historical shoreline positions are based on data from aerial photographs (1954) and topographic maps (1981).

  7. w

    DGS Geologic Map No. 11 (Milton-Ellendale area)

    • data.wu.ac.at
    wfs, wms
    Updated Dec 5, 2017
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    (2017). DGS Geologic Map No. 11 (Milton-Ellendale area) [Dataset]. https://data.wu.ac.at/schema/geothermaldata_org/YzUzZmQ2ODQtNzNiMS00YmRiLTgzMDAtODA3ODYwZWI4Zjg4
    Explore at:
    wfs, wmsAvailable download formats
    Dataset updated
    Dec 5, 2017
    Area covered
    f1110c6dc89d683372ae409c82ed70315b039bf0
    Description

    This data set contains the rock unit polygons for the surficial geology in the Delaware Coastal Plain covered by DGS Geologic Map No. 11 (Milton-Ellendale area) in ESRI shapefile format. The original Geologic Map Description of the published map follows: The surficial geology of the Ellendale and Milton quadrangles reflects the geologic history of the Delaware Bay estuary and successive high and low sea levels during the Quaternary. Ramsey (1992) interpreted the Beaverdam Formation as deposits of a fluvial-estuarine system during the Pliocene. Sediment supply was high, in part due to geomorphic adjustments in the Appalachians related to the first major North Hemisphere glaciations around 2.4 million years ago. The Beaverdam Formation forms the core of the central Delmarva Peninsula around which wrap the Quaternary deposits. The Columbia Formation which is recognized to the north of the map area was deposited as the result of the distal portion of glacial outwash of the Delaware and possibly Susquehanna rivers during the early Pleistocene (Ramsey, 1997). After the deposition of the Columbia, the Delaware River and Bay developed their present geographic positions. In the northwest portion of the map area contiguous with the area mapped by Ramsey (1993) as the Columbia Formation, the surficial unit has many similarities in texture, color, bedding, geophysical log character, and thickness with the Beaverdam Formation to the south and east. No diagnostic pollen-bearing beds or other fossils have been found in the area to aid in identification of the unit. Because of the continuity in thickness and lithic character with the Beaverdam, the area in mapped as Tbd?. Where the Beaverdam is mapped, silty clay to clayey silt beds yielded pollen assemblages characteristic of the unit (Andres and Ramsey, 1995, 1996; Groot and Jordan, 1999). The Lynch Heights and Scotts Corners formations (Ramsey, 1993, 1997) represent shoreline and estuarine deposits associated with high stands of sea level during the middle to late Pleistocene on the margins of Delaware Bay. The western boundary of these units is found at a topographic break (scarp) that marks the ancestral, erosional shoreline of Delaware Bay during the sea-level high stand. Upland dunes (Qd) are extensive linear dunes and large dune fields found along the contact between the Lynch Heights and older deposits to the west. Some of these dunes may be relict coastal dunes associated with the ancestral shoreline of Delaware Bay at the time of Lynch Heights deposition. Dunes to the west may be younger; late Pleistocene or early Holocene in age. Carolina Bay deposits are circular to semi-circular depressions with sand rims found in the northern half of the Milton Quadrangle. They are thought to be cold climate features associated with reduced tree cover and increased winds during the glacial periods of the Pleistocene (Ramsey, 1997). Quaternary upland deposits (Qud) cover much of the southern half of the Ellendale Quadrangle. These deposits represent deposition in swamps associated with poor drainage and eolian deposition during cold climate phase of the late Pleistocene and early Holocene. The eolian sands are found both as small dunes in this area, but more commonly, as sheets of fine to medium sand with no to rare sedimentary structures. Although no radiocarbon dates have been collected from this area, the age of the deposits is considered to be latest Pleistocene to early Holocene on the bases of similarities in stratigraphic position and depositional style with the Cypress Swamp Formation (Andres and Howard, 2000) found to the south of the map area. Quaternary and older deposits are transgressed by Holocene swamp, marsh, shoreline, and estuarine deposits along the stream valleys and shoreline of Delaware Bay. Stratigraphic units found at depth within the map area are shown with the geophysical log of Ng42-17, a deep test well drilled in Milton. Major aquifer units are also shown. Cross section A-A' is a north-south section roughly along Route 113 through the center of the Ellendale Quadrangle. It shows the relationship of the Beaverdam Formation (Tbd?) and the Beaverdam Formation (Tbd). Also shown are the units underlying the surficial units and position of the major aquifers. Cross-section B-B' is a west-east section showing the relationships between the Quaternary-Tertiary deposits undifferentiated, Lynch Heights, and Scotts Corners formations as well as underlying stratigraphic units. Aquifers shown in the cross-sections are water-bearing sand layers that are used for public, domestic, agricultural, and industrial sources of water. Where the surficial or water-table aquifer is in contact with sands of an underlying geologic unit such as the Manokin formation, the entire water-bearing unit is called the Columbia aquifer.

  8. w

    DGS Geologic Map No. 12 (Lewes-Cape Henlopen area)

    • data.wu.ac.at
    wfs, wms
    Updated Dec 4, 2017
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    (2017). DGS Geologic Map No. 12 (Lewes-Cape Henlopen area) [Dataset]. https://data.wu.ac.at/schema/geothermaldata_org/MDVjNWY4ZmMtZmU5ZS00NWRkLTg1YjMtNmQ0OTI0NzM1ZWM1
    Explore at:
    wms, wfsAvailable download formats
    Dataset updated
    Dec 4, 2017
    Area covered
    3a3d6bd9ff58a8c8575e45e29b76b1e7843b79db
    Description

    This data set contains the rock unit polygons for the surficial geology in ESRI shapefile format for the Delaware Coastal Plain covered by DGS Geologic Map No. 12 (Lewes-Cape Henlopen area). The original Geologic Map Description of the published map follows: The surficial geology of the Lewes and Cape Henlopen quadrangles reflects the geologic history of the Delaware Bay estuary and successive high and low stands of sea levels during the Quaternary. The subsurface Beaverdam Formation was deposited as part of a fluvial-estuarine system during the Pliocene, the sediments of which now form the core of the Delmarva Peninsula. Following a period of glacial outwash during the early Pleistocene represented by the Columbia Formation found to the northwest of the map area (Ramsey, 1997), the Delaware River and Estuary developed their current positions. The Lynch Heights and Scotts Corners formations (Ramsey, 1993, 1997, 2001) represent shoreline and estuarine deposits associated with high stands of sea level during the middle to late Pleistocene on the margins of the Delaware Estuary. In the map area, the Lynch Heights Formation includes relict spit and dune deposits at the ancestral intersection of the Atlantic Coast and Delaware Bay systems, similar in geomorphic position to the modern Cape Henlopen. The relationship between the Lynch Heights and Scotts Corners is shown in cross-section A-A'. The Lynch Heights is composed of a fine, well-sorted sand. The break in topography (scarp) between the surface of the Lynch Heights (at approx. 25 ft and higher) and that of the Scotts Corners (at approx. 6 to 15 feet) represents ancestral shorelines of Delaware Bay during a high sea level contemporaneous with the deposition of the Scotts Corners. The cross section also shows two depositional units within the Scotts Corners. A younger shoreline sequence with sand at the land surface has cut into an older unit (marked by silt at the land surface). Gravel beds within both units represent shoreline deposits like those found along the modern Delaware Bay in the area. Two depositional units within the Scotts Corners is consistent with observations of the Scotts Corners by Ramsey (1997) just to the north of the map area. Both of these units were deposited during the last interglacial period. The older unit may be attributed to the high sea stand at 120,000 years B.P. and the younger unit to one at 80,000 years B.P. (Ramsey, 1997). Quaternary deposits were transgressed by Holocene swamp, marsh, shoreline, estuarine and spit deposits. The spit deposits form the modern Cape Henlopen (Ramsey, et al., 2000, Ramsey, 1999). Cross-section B-B' depicts sediment distribution within the Cape Henlopen complex and stratigraphic relationships with units underlying the Holocene spit deposits. Offshore surficial sediment distribution is a compilation of historical offshore core and grab sample textural descriptions and data (Hoyt, 1982, Maley, 1981, Marx, 1981, Oostdam, 1971, Sheridan et al., 1974, Strom, 1972, 1976, Terchunian, 1985, Weil, 1976, Wethe et al., 1982, 1982a, 1983 and unpublished data in DGS files). From core descriptions, the top six inches was used as the surficial sediment type. Sediment textures shown on the map show a general distribution of sediment size over a large area. Site-specific information about bottom sediment textures may require additional sampling. Refer to the adjacent triangular diagram for sediment texture abbreviations. Historical shoreline positions are from historical U.S. Coast&Geodetic Survey T-sheets (1884) and topographic maps (1944, 1977). Stratigraphic units found at depth within the map area are shown with the geophysical log of Ni31-07, a 1035-foot deep geothermal test hole drilled in 1978 for the U.S. Department of Energy. Major aquifer units are also shown (Andres, 1986).

  9. w

    DGS Geologic Map No. 9 (Seaford area)

    • data.wu.ac.at
    wfs, wms
    Updated Dec 5, 2017
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    (2017). DGS Geologic Map No. 9 (Seaford area) [Dataset]. https://data.wu.ac.at/schema/geothermaldata_org/YjZhMmExZTAtNmQxZS00ODkwLWI0NTMtZDNkYTdiODZkODc1
    Explore at:
    wfs, wmsAvailable download formats
    Dataset updated
    Dec 5, 2017
    Area covered
    c7577c9b98aa2ccaa1d476a1cf835be2da39c750
    Description

    This vector dataset contains the rock unit polygons for DGS Geologic Map No. 9 (Seaford area). The original Geologic Map Description of the published map follows: This map shows the distribution of geologic units found at or near land surface. These units support agriculture and development, are mined for sand and gravel resources, and are the surface-to-subsurface pathway for water. Previous maps and reports covering the same or adjacent areas have focused on hydrogeology (Andres, 1994), surficial geology on a regional scale (Jordan, 1964, 1974; Owens and Denny, 1979, 1986; Denny et al., 1979; Ramsey and Schenck, 1990), or subsurface geology (Hansen, 1981, Andres, 1986). Earlier work in the area of Seaford assigned surficial deposits to the Pleistocene without formational designation (Marine and Rasmussen, 1955). Rasmussen et al. (1960) recognized near-surface units as the Parsonsburg Sand, the Pamlico Formation, the Beaverdam Sand, and the Brandywine Formation. Of these units, only the Beaverdam has been retained for usage in Delaware (Jordan, 1974). Jordan (1974) assigned geologic units in the map area to the Columbia Group, which in Southern Delaware consited of the Beaverdam and Omar Formations. Jordan (1964, 1974) also recognized a sand deposit with some silts in the Nanticoke River valley that was associated with a topographic feature called the Nanticoke Ridge and a subsurface deposit that was not assigned to a particular stratigraphic unit but considered to be of Pleistocene age. Owens and Denny (1979, Fig. 5) extended stratigraphic units recognized in Maryland and New Jersey into Delaware; these include the Beaverdam Sand and the Pensauken Formation, the latter in a small band southeast of Bridgeville. Denny et al. (1979, Fig. 1) mapped the Parsonsburg Sand in the southern area of the Seaford East Quadrangle, and the Kent Island Formation in the area of the floodplain of the Nanticoke River. Ramsey and Schenck (1990) mapped the Columbia Formation in the northwestern portion of the map area, the Beaverdam Formation over most of the map area, and an informal unit, the Nanticoke deposits, along the Nanticoke River valley. Andres (1994) used the nomenclature of Ramsey and Schenck (1990), but modified some of the lithologic descriptions. The stratigraphic units on this map were recognized by their lithologic characteristics and internal stratigraphy from examination of more than 620 lithologic logs from water wells test-hole borings, outcrops in pits and ditches, and shallow hand-auger borings. The map units were compared with previously named units to determine the stratigraphic nomenclature. A consensus of those who have worked in the area is that the Beaverdam Formation is present (Rasmussen et al., 1960; Jordan, 1974; Owens and Denny, 1979; Ramsey and Schenck, 1990; Andres, 1994). Other than by Ramsey and Schenck (1990), the Columbia Formation had not been mapped this far south. Our detailed work did not recognize the Columbia in the map area. Largely on the basis of lithologic criteria, Jordan (1974) hypothesized that the Beaverdam and Omar Formations were downdip facies of the Columbia Formation and included the Beaverdam and Omar in the Columbia Group. He acknowledged that a definite Pleistocene age, except for the Omar Formation in southeastern Delaware, could not be proven. From lithologic evidence Jordan (1974) interpreted that the Columbia Formation was of Pleistocene age and, by correlation, the Beaverdam also was of Pleistocene age. No surficial exposures of the Beaverdam were recognized in Delaware at that time. Recent investigations (Ramsey and Schenck, 1990; Groot and others, 1995; DGS unpublished palynologic data) and field work for this map indicate: (1) the Omar Formation is not present in the map area; (2) the Nanticoke deposits, possibly the same age as the Omar, are restricted to the valley and valley margins of the Nanticoke River and do not blanket the entire area; (3) the Beaverdam Formation is found to be a surficial deposit in the map area; (4) the Beaverdam Formation, where palynologic data have been analyzed, within the map area and elsewhere, is of Pliocene age with a flora characteristic of a temperate climate; a nd (5) the Columbia Formation, where palynologic data have been analyzed, is of a middle to early Pleistocene age with a flora indicating a cool climate. Given the differences in age, lithic character, and fossil content, the Beaverdam is no longer considered to be a downdip facies of the Columbia Formation. The contact between the two formations is inferred to be unconformable and lies to the north of the map area. The Nanticoke deposits are retained in the sense of Ramsey and Schenck (1990) and Andres (1994) and, in part, include the deposits Jordan (1974) associated with the Nanticoke Ridge and unassigned deposits of Pleisotcene age in the Nanticoke River valley. Other names previously used for Pleistocene age in the Nanticoke River valley. Other names previously used for Pleistocene units were rejected because lithologic descriptions differ from those of units found in the map area or the named units had been considered and dismissed from being present in Delaware (Jordan 1962, 1964, 1974). Descriptions of Holocene units (marsh and swamp deposits) follow those of Ramsey (1993) with a few slight modifications. Two additional Quaternary units within the map area are introduced: alluvial and upland bog deposits. These units are recognized on the bases of observations in hand-auger boreholes, exposures in drainage ditches, and distinctive appearance on aerial photographs. Because swamp, marsh, bog, and alluvial deposits occur in active depositional settings, their distributions were mapped on the basis of vegetation observed on aerial photographs and were spot-checked in the field for accuracy. The map distributions of these deposits are not to be used for wetlands designations or delineations. Published (Groot et al., 1990) and unpublished (J.J. Groot, written communication) palynological data were useful in assisting interpretations of stratigraphy and paleoenvironments of the deposits. Recognition of subsurface units (Choptank, St. Marys, and Manokin formations) is an extension of the work of Talley (1974), Hansen (1981), Andres (1986), Groot et al. (1990), Benson (1990), and Ramsey and Schenck (1990).

  10. a

    Explore Delaware Geology

    • de-firstmap-delaware.hub.arcgis.com
    Updated May 18, 2023
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    University of Delaware (2023). Explore Delaware Geology [Dataset]. https://de-firstmap-delaware.hub.arcgis.com/datasets/udel::explore-delaware-geology-2
    Explore at:
    Dataset updated
    May 18, 2023
    Dataset authored and provided by
    University of Delaware
    Description

    Although Delaware is the second to smallest state in the U.S. and has mostly flat topography, the state has many geologic features of interest ranging from Piedmont hard rocks to Coastal Plain sand dunes. This story map will take you through these locations in Delaware and highlight a few geologic facts about the First State.

  11. d

    Map of Chronic Wasting Disease in North America

    • dataone.org
    • datadiscoverystudio.org
    • +1more
    Updated Oct 29, 2016
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    U. S. Geological Survey National Wildlife Health Center (NWHC) (2016). Map of Chronic Wasting Disease in North America [Dataset]. https://dataone.org/datasets/85ddc460-041f-42e0-a158-10b9b493a3fc
    Explore at:
    Dataset updated
    Oct 29, 2016
    Dataset provided by
    United States Geological Surveyhttp://www.usgs.gov/
    Authors
    U. S. Geological Survey National Wildlife Health Center (NWHC)
    Time period covered
    Jan 1, 1980
    Area covered
    Variables measured
    NA
    Description

    Chronic Wasting Disease (CWD) is a fatal, contagious, neuro-degenerative disease affecting multiple members of the Family Cervidae. First detected in 1967, the disease has, to-date, been documented in free-ranging and/or captive cervid populations in 24 states, two Canadian provinces, the Republic of South Korea, and Norway. The USGS National Wildlife Health Center (NWHC) tracks changes to the known distribution of CWD in the form of a map (available on the NWHC website).

  12. a

    Wastewater Disposal-Rapid Infiltration - Delaware County

    • gis-odnr.opendata.arcgis.com
    • hub.arcgis.com
    Updated Nov 6, 2024
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    Ohio Department of Natural Resources (2024). Wastewater Disposal-Rapid Infiltration - Delaware County [Dataset]. https://gis-odnr.opendata.arcgis.com/datasets/wastewater-disposal-rapid-infiltration-delaware-county
    Explore at:
    Dataset updated
    Nov 6, 2024
    Dataset authored and provided by
    Ohio Department of Natural Resources
    License

    MIT Licensehttps://opensource.org/licenses/MIT
    License information was derived automatically

    Description

    Download .zip 10 ft Depth to Bedrock 5-10 ft Flooding Frequency None

    Permeability of the first horizon (about 0-15 in) was not included in the analysis because all Delaware County Soils have unsuitable permeability. Suitabilities are given only for land designated as cropland in the Land use/ land cover inventory.

    This analysis is not meant to substitute for an onsite investigation.

    Coverages utilized in this analysis were digitized from a mylar county map with a scale of 1:63360, land use on quadrangle maps at a scale of 1:24000 and soil survey maps with a scale of 1:15840. Digitizing used run length encoding techniques, sampling along horizontal lines which represented the midline of cells with a height of 250 ft. The horizontal measurement increment along these lines was one decafoot (10 feet). Additional details of the digitizing process are available on request. The coverage was subsequently converted to an Arc/Info vector format.

    Original coverage data was converted from the .e00 file to a more standard ESRI shapefile(s) in November 2014.Contact Information:GIS Support, ODNR GIS ServicesOhio Department of Natural ResourcesReal Estate & Land ManagementReal Estate and Lands Management2045 Morse Rd, Bldg I-2Columbus, OH, 43229Telephone: 614-265-6462Email: gis.support@dnr.ohio.gov

  13. a

    Delaware Political Boundaries

    • de-firstmap-delaware.hub.arcgis.com
    • hub.arcgis.com
    Updated Aug 28, 2020
    + more versions
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    State of Delaware (2020). Delaware Political Boundaries [Dataset]. https://de-firstmap-delaware.hub.arcgis.com/maps/f0e34ab7292c4454bdb5efa2598a0689
    Explore at:
    Dataset updated
    Aug 28, 2020
    Dataset authored and provided by
    State of Delaware
    Area covered
    Description

    The Delaware General Assembly consists of 62 legislators in Delaware. The General Assembly is comprised of 21 Senators and 41 Representatives. Senators are elected to 4 years terms and Representatives are elected to 2 years terms. The dataset reflects the current General Assembly.The districts were created after the 2010 decennial census and will be updated again after the 2020 decennial census if necessary. Districts are created based on information from the decennial census.

  14. Delaware Watershed National Fish and Wildlife Foundation Grants, Bipartisan...

    • hub.arcgis.com
    • gis-fws.opendata.arcgis.com
    Updated Aug 23, 2023
    + more versions
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    U.S. Fish & Wildlife Service (2023). Delaware Watershed National Fish and Wildlife Foundation Grants, Bipartisan Infrastructure Law Funded Projects, 2023, FWS Northeast Region [Dataset]. https://hub.arcgis.com/maps/fws::delaware-watershed-national-fish-and-wildlife-foundation-grants-bipartisan-infrastructure-law-funded-projects-2023-fws-northeast-region
    Explore at:
    Dataset updated
    Aug 23, 2023
    Dataset provided by
    U.S. Fish and Wildlife Servicehttp://www.fws.gov/
    Authors
    U.S. Fish & Wildlife Service
    Area covered
    Description

    n 2018, the National Fish and Wildlife Foundation launched the Delaware Watershed Conservation Fund in partnership with the U.S. Fish and Wildlife Service. The fund represents the first step in implementing a strategy developed by partners with guidance from the Service to focus conservation in four key areas: clean water, habitat, recreation, and flow management. This map displays projects that have been awarded funding to date to help conserve and connect lands and waterways that support native fish, wildlife, and plants, and contribute to the vitality of the communities in the watershed.This dataset represents the 6projects, out of the total 36, that were awarded Bipartisan Infrastructure Law (BIL) funds. BIL awarded $4.5 million to fund innovative projects that use nature-based infrastructure to support restoration efforts in the Delaware watershed. All 36 projects funded in 2023 can be found here: https://fws.maps.arcgis.com/home/item.html?id=5be3206e81064ab49a2f08ecbc7adc88

  15. a

    Land Use 2000

    • hub.arcgis.com
    • catalog.dvrpc.org
    • +3more
    Updated Feb 16, 2025
    + more versions
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    DVRPC-GIS (2025). Land Use 2000 [Dataset]. https://hub.arcgis.com/maps/dvrpcgis::land-use-2000
    Explore at:
    Dataset updated
    Feb 16, 2025
    Dataset provided by
    Delaware Valley Regional Planning Commissionhttps://www.dvrpc.org/
    Authors
    DVRPC-GIS
    Area covered
    Description

    Every five years, since 1990, the Delaware Valley Regional Planning Commission has produced a GIS Land Use layer for its 9-county region. In 2000, digital orthophotography was flown by DVRPC. Utilizing this orthophotography, all Land Use annotation and digitizing was performed on-screen, or "heads-up," a first at DVRPC. Digitizing was done using ESRI ArcGIS 8 software at a 1:2400 (1 inch = 200 feet) scale.

  16. a

    Imagery 2020 - DVRPC

    • hub.arcgis.com
    • data-montcopa.opendata.arcgis.com
    Updated Sep 16, 2020
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    Montgomery County (2020). Imagery 2020 - DVRPC [Dataset]. https://hub.arcgis.com/maps/72c68bcb94904a8c85b2095fe0430969
    Explore at:
    Dataset updated
    Sep 16, 2020
    Dataset authored and provided by
    Montgomery County
    Area covered
    Description

    This orthoimagery consists of 1-foot pixel resolution, 3-band, natural color county mosaics in JPEG 2000 format covering the Delaware Valley Regional Planning Commission’s (DVRPC) 9-county region (Bucks, Chester, Delaware, Montgomery, and Philadelphia counties in Pennsylvania; and Burlington, Camden, Gloucester, and Mercer counties in New Jersey). This orthoimagery was acquired in the late winter/early spring of 2020 by NearMap. An orthoimage is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthoimagery combines the image characteristics of a photograph with the geometric qualities of a map.

  17. 14 Digit Hydrologic Unit Code Delineations for New Jersey

    • njogis-newjersey.opendata.arcgis.com
    • share-open-data-njtpa.hub.arcgis.com
    • +2more
    Updated Mar 9, 2016
    Share
    FacebookFacebook
    TwitterTwitter
    Email
    Click to copy link
    Link copied
    Close
    Cite
    NJDEP Bureau of GIS (2016). 14 Digit Hydrologic Unit Code Delineations for New Jersey [Dataset]. https://njogis-newjersey.opendata.arcgis.com/datasets/8de4c55bcf6540bcbe173df2b0552eb2
    Explore at:
    Dataset updated
    Mar 9, 2016
    Dataset provided by
    New Jersey Department of Environmental Protectionhttp://www.nj.gov/dep/
    Authors
    NJDEP Bureau of GIS
    Area covered
    Description

    The 14-digit hydrologic units (HUC14s) in New Jersey is a revision of the 20110225 version of these units. This version corrects 290 overlapping topology errors which were extremely small and visually undetectable. The 14-digit hydrologic units (HUC14s) in New Jersey is a revision of the 2006 version of these units. This version corrects some boundaries to be consistent with a new hydrography coverage based on 1:2,400 aerial photographs (NJDEP, 2008). It also makes some changes to be more consistent with a new 12-digit hydrologic unit coverage (EPA, 2009). This editing process created 42 new HUC14s, deleted one inland HUC14 and five coastal HUC14s in the Delaware Bay, and changed over 100 boundaries. A report detailing these changes (Hoffman and Pallis, 2009) is available online . For programmatic reasons the 14-digit units are clipped to New Jersey's political boundary. HUC14 hydrologic units were first published by Ellis and Price (1995) and made available as a shape file by the New Jersey Department of Environmental Protection soon afterword. Watershed boundaries were based on elevations and water courses from 1:24,000-scale (7.5-minute) USGS quadrangles. These were revised (NJDEP, 2006) by clipping the unit boundaries to the official NJ state boundary and addition of some additional identification information. Some boundaries were changed at that time to reflect errors found in the original coverage. This product is an interim product and will be replaced once better elevational data are available. It is based on elevational data from quadrangle maps at a scale of 1:24,000. The hydrography is at 1:2,400. Once high-resolution LiDAR data (at 1:2,400 or better) become available for New Jersey the 14-digit hydrologic units will be redrawn and this interim coverage will be replaced. EPA's 12-digit hydrologic system (USEPA, 2009) uses a numbering convention that is not entirely consistent with the 14-digit numbering system. For some HUC14s, the first 12 digits do not match the identification number of the 12-digit hydrologic unit it lies within. These discrepancies will be corrected when the HUC14s are next revised.

  18. Not seeing a result you expected?
    Learn how you can add new datasets to our index.

Share
FacebookFacebook
TwitterTwitter
Email
Click to copy link
Link copied
Close
Cite
State of Delaware (2023). Delaware Census 2020 [Dataset]. https://hub.arcgis.com/maps/58bbc1f460ca4e2ab96d43f9308924ca

Delaware Census 2020

Explore at:
Dataset updated
Mar 1, 2023
Dataset authored and provided by
State of Delaware
Area covered
Description

Census tracts are small, relatively permanent statistical subdivisions of a county or equivalent entity, and were defined by local participants as part of the 2020 Census Participant Statistical Areas Program. The Census Bureau delineated the census tracts in situations where no local participant existed or where all the potential participants declined to participate. The primary purpose of census tracts is to provide a stable set of geographic units for the presentation of census data and comparison back to previous decennial censuses. Block Groups (BGs) are clusters of blocks within the same census tract. Each census tract contains at least one BG, and BGs are uniquely numbered within census tracts. BGs have a valid code range of 0 through 9. BGs have the same first digit of their 4-digit census block number from the same decennial census. Census blocks are relatively small in area; for example, a block in a city bounded by streets. However, census blocks in remote areas are often large and irregular and may even be many square miles in area. After each decennial census, the Census Bureau delineates urban areas that represent densely developed territory, encompassing residential, commercial, and other nonresidential urban land uses. In general, this territory consists of areas of high population density and urban land use resulting in a representation of the urban footprint.

Search
Clear search
Close search
Google apps
Main menu