100+ datasets found
  1. d

    Database for the geologic map of the South Boston 30' x 60' Quadrangle,...

    • catalog.data.gov
    • data.usgs.gov
    • +2more
    Updated Jul 6, 2024
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    U.S. Geological Survey (2024). Database for the geologic map of the South Boston 30' x 60' Quadrangle, Virginia and North Carolina [Dataset]. https://catalog.data.gov/dataset/database-for-the-geologic-map-of-the-south-boston-30-x-60-quadrangle-virginia-and-north-ca
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    Dataset updated
    Jul 6, 2024
    Dataset provided by
    United States Geological Surveyhttp://www.usgs.gov/
    Area covered
    Virginia, North Carolina, South Boston
    Description

    The 1:100,000-scale geologic map of the South Boston 30' x 60' quadrangle, Virginia and North Carolina, provides geologic information for the Piedmont along the I-85 and U.S. Route 58 corridors and in the Roanoke River watershed, which includes the John H. Kerr Reservoir and Lake Gaston. The Raleigh terrane (located on the eastern side of the map) contains Neoproterozoic to early Paleozoic(?) polydeformed, amphibolite-facies gneisses and schists. The Carolina slate belt of the Carolina terrane (located in the central part of the map) contains Neoproterozoic metavolcanic and metasedimentary rocks at greenschist facies. Although locally complicated, the slate-belt structure mapped across the South Boston map area is generally a broad, complex anticlinorium of the Hyco Formation (here called the Chase City anticlinorium) and is flanked to the west and east by synclinoria, which are cored by the overlying Aaron and Virgilina Formations. The western flank of the Carolina terrane (located in the western-central part of the map) contains similar rocks at higher metamorphic grade. This terrane includes epidote-amphibolite-facies to amphibolite-facies gneisses of the Neoproterozoic Country Line complex, which extends north-northeastward across the map. The Milton terrane (located on the western side of the map) contains Ordovician amphibolite-facies metavolcanic and metasedimentary gneisses of the Cunningham complex. Crosscutting relations and fabrics in mafic to felsic plutonic rocks constrain the timing of Neoproterozoic to late Paleozoic deformations across the Piedmont. In the eastern part of the map, a 5- to 9-kilometer-wide band of tectonic elements that contains two late Paleozoic mylonite zones (Nutbush Creek and Lake Gordon) and syntectonic granite (Buggs Island pluton) separates the Raleigh and Carolina terranes. Amphibolite-facies, infrastructural metaigneous and metasedimentary rocks east of the Lake Gordon mylonite zone are generally assigned to the Raleigh terrane. In the western part of the map area, a 5- to 8-kilometer-wide band of late Paleozoic tectonic elements includes the Hyco and Clover shear zones, syntectonic granitic sheets, and amphibolite-facies gneisses along the western margin of the Carolina terrane at its boundary with the Milton terrane. This band of tectonic elements is also the locus for early Mesozoic extensional faults associated with the early Mesozoic Scottsburg, Randolph, and Roanoke Creek rift basins. The map shows fluvial terrace deposits of sand and gravel on hills and slopes near the Roanoke and Dan Rivers. The terrace deposits that are highest in altitude are the oldest. Saprolite regolith is spatially associated with geologic source units and is not shown separately on the map. Mineral resources in the area include gneiss and granite quarried for crushed stone, tungsten-bearing vein deposits of the Hamme district, and copper and gold deposits of the Virgilina district. Surface-water resources are abundant and include rivers, tributaries, the John H. Kerr Reservoir, and Lake Gaston. Groundwater flow is concentrated in saprolite regolith, along fractures in the crystalline bedrock, and along fractures and bedding-plane partings in the Mesozoic rift basins.

  2. A

    Boston Neighborhood Boundaries Approximated by 2020 Census Tracts

    • data.boston.gov
    • bostonopendata-boston.opendata.arcgis.com
    Updated Nov 15, 2024
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    Boston Neighborhood Boundaries Approximated by 2020 Census Tracts [Dataset]. https://data.boston.gov/dataset/boston-neighborhood-boundaries-approximated-by-2020-census-tracts
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    geojson, kml, csv, html, arcgis geoservices rest api, shpAvailable download formats
    Dataset updated
    Nov 15, 2024
    Dataset authored and provided by
    Boston Maps
    License

    ODC Public Domain Dedication and Licence (PDDL) v1.0http://www.opendatacommons.org/licenses/pddl/1.0/
    License information was derived automatically

    Area covered
    Boston
    Description

    The Census Bureau does not recognize or release data for Boston neighborhoods. However, Census tracts can be aggregated to approximate Boston neighborhood boundaries to allow for reporting and visualization of Census data at the neighborhood level. Census tracts are created by the U.S. Census Bureau as statistical geographic subdivisions of a county defined for the tabulation and presentation of data from the decennial census and the American Community Survey. The 2020 Census tract boundary files for Boston can be found here. These tract-approximated neighborhood boundaries are used for work with Census data. Work that does not rely on Census data generally uses the Boston neighborhood boundaries found here.

  3. Boston Harbor Islands National Recreation Area Tract and Boundary Data

    • catalog.data.gov
    Updated Jun 4, 2024
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    National Park Service (2024). Boston Harbor Islands National Recreation Area Tract and Boundary Data [Dataset]. https://catalog.data.gov/dataset/boston-harbor-islands-national-recreation-area-tract-and-boundary-data
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    Dataset updated
    Jun 4, 2024
    Dataset provided by
    National Park Servicehttp://www.nps.gov/
    Area covered
    Harbor Islands- Long Island, Boston
    Description

    These ESRI shape files are of National Park Service tract and boundary data that was created by the Land Resources Division. Bounds of the tracts and islands are photo interpreted from 1996 ortho photo mosaics created by the University of Rhode Island for the park. Tracts and islands are consistent with the legislated boundaries defined by PL 104-333 which also references map number BOHA 80,002. Tracts are numbered and created by the regional cartographic staff at the Land Resources Program Centers and are associated to the Land Status Maps. This data should be used to display properties that NPS owns and properties that NPS may have some type of interest such as scenic easements or right of ways.

  4. a

    Boston - Highway Access

    • hub.arcgis.com
    Updated Jun 8, 2016
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    Civic Analytics Network (2016). Boston - Highway Access [Dataset]. https://hub.arcgis.com/maps/2086eef8953e4ce190ab41a6a0dd0665
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    Dataset updated
    Jun 8, 2016
    Dataset authored and provided by
    Civic Analytics Network
    Area covered
    Description

    Areas that are within 10 minutes of an exit are emphasized on this map, to give an indication of how accessible neighborhoods are by highway. The colors represent 1, 3, 5 and 10 minute increments from the exits, based on posted exit speeds and local road speeds in ideal conditions. The areas were calculated using ready to use services hosted in ArcGIS which feature a road network from HERE. A simple geoprocessing tool sent 40,000+ exit locations to the service, which returned the 160,000+ polygons. ---------------------The Civic Analytics Network collaborates on shared projects that advance the use of data visualization and predictive analytics in solving important urban problems related to economic opportunity, poverty reduction, and addressing the root causes of social problems of equity and opportunity. For more information see About the Civil Analytics Network.

  5. South Boston Dorchester Avenue Proposed Zone Change

    • hub.arcgis.com
    Updated Jun 8, 2020
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    Esri Tutorials (2020). South Boston Dorchester Avenue Proposed Zone Change [Dataset]. https://hub.arcgis.com/maps/670e6df747524102b4cd9f7ca8627642
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    Dataset updated
    Jun 8, 2020
    Dataset provided by
    Esrihttp://esri.com/
    Authors
    Esri Tutorials
    Area covered
    Description

    This map displays data from chapters 1 through 4 of the PLAN South Boston Dorchester Avenue report, which contains the history, current conditions, outreach initiatives, goals, and objectives of a proposed plan to create a new mixed-use urban district in Boston, Massachusetts. The map contains four layers:Study AreaFuture DevelopmentsParcelsZoningThis map is intended for use in the Storify a planning report tutorial, which details the process of creating a story in ArcGIS StoryMaps for the plan. The story includes maps and a scene that showcase the proposed district. The plan itself was created by the Boston Planning & Development Agency (BPDA).

  6. d

    Sea floor maps showing topography, sun-illuminated topographic imagery, and...

    • catalog.data.gov
    • datadiscoverystudio.org
    • +3more
    Updated Jul 6, 2024
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    U.S. Geological Survey (2024). Sea floor maps showing topography, sun-illuminated topographic imagery, and backscatter intensity of the Stellwagen Bank National Marine Sanctuary Region off Boston, Massachusetts [Dataset]. https://catalog.data.gov/dataset/sea-floor-maps-showing-topography-sun-illuminated-topographic-imagery-and-backscatter-inte
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    Dataset updated
    Jul 6, 2024
    Dataset provided by
    United States Geological Surveyhttp://www.usgs.gov/
    Area covered
    Boston, Gerry E. Studds/Stellwagen Bank National Marine Sanctuary, Massachusetts
    Description

    This data set contains the sea floor topographic contours, sun-illuminated topographic imagery, and backscatter intensity generated from a multibeam sonar survey of the Stellwagen Bank National Marine Sanctuary region off Boston, Massachusetts, an area of approximately 1100 square nautical miles. The Stellwagen Bank NMS Mapping Project is designed to provide detailed maps of the Stellwagen Bank region's environments and habitats and the first complete multibeam topographic and sea floor characterization maps of a significant region of the shallow EEZ. Data were collected on four cruises over a two year period from the fall of 1994 to the fall of 1996. The surveys were conducted aboard the Candian Hydrographic Service vessel Frederick G. Creed, a SWATH (Small Waterplane Twin Hull) ship that surveys at speeds of 16 knots. The multibeam data were collected utilizing a Simrad Subsea EM 1000 Multibeam Echo Sounder (95 kHz) that is permanently installed in the hull of the Creed.

  7. w

    Public Works Districts

    • data.wu.ac.at
    • data.boston.gov
    • +3more
    Updated Aug 26, 2015
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    BostonMaps (2015). Public Works Districts [Dataset]. https://data.wu.ac.at/schema/data_opendatasoft_com/cHVibGljLXdvcmtzLWRpc3RyaWN0c0BtYXBhdGhvbi1wdWJsaWM=
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    json, kml, xls, csv, application/vnd.geo+jsonAvailable download formats
    Dataset updated
    Aug 26, 2015
    Dataset provided by
    BostonMaps
    Description

    City of Boston Public Works Department (PWD) districts as of August 2015.

  8. Imagery data for the Vegetation Mapping Inventory Project of Boston Harbor...

    • s.cnmilf.com
    • catalog.data.gov
    Updated Jun 5, 2024
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    National Park Service (2024). Imagery data for the Vegetation Mapping Inventory Project of Boston Harbor Islands National Recreation Area [Dataset]. https://s.cnmilf.com/user74170196/https/catalog.data.gov/dataset/imagery-data-for-the-vegetation-mapping-inventory-project-of-boston-harbor-islands-nationa
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    Dataset updated
    Jun 5, 2024
    Dataset provided by
    National Park Servicehttp://www.nps.gov/
    Area covered
    Harbor Islands- Long Island, Boston
    Description

    This reference contains the imagery data used in the completion of the baseline vegetation inventory project for the NPS park unit. Orthophotos, raw imagery, and scanned aerial photos are common files held here. High-quality existing photography housed by the Commonwealth of Massachusetts Office of Geographic and Environmental Information (MassGIS) was used as the base for the BOHA vegetation map. A true color orthophotomosaic was developed from a set of digital 1:5,000 scale medium resolution true color aerial images that are considered the new "basemap" for the Commonwealth of Massachusetts by MassGIS and the Executive Office of Environmental Affairs (EOEA) until 2005 DOQs became available in 2006 (MassGIS 2007). The photography for the entire commonwealth was captured in April 2005 when deciduous trees were mostly bare and the ground was generally free of snow. The image type is 4-band (RGBN) natural color (Red, Green, Blue) and Near infrared in 8 bits (values ranging 0-255) per band format.

  9. m

    Police Districts

    • gis.data.mass.gov
    • data.boston.gov
    • +2more
    Updated Apr 9, 2015
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    BostonMaps (2015). Police Districts [Dataset]. https://gis.data.mass.gov/datasets/boston::police-districts
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    Dataset updated
    Apr 9, 2015
    Dataset authored and provided by
    BostonMaps
    License

    ODC Public Domain Dedication and Licence (PDDL) v1.0http://www.opendatacommons.org/licenses/pddl/1.0/
    License information was derived automatically

    Area covered
    Description

    Authoritative police districts dataset for the City of Boston.

  10. K

    Boston, Massachusetts Neighborhoods

    • koordinates.com
    csv, dwg, geodatabase +6
    Updated Sep 6, 2018
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    City of Boston, Massachusetts (2018). Boston, Massachusetts Neighborhoods [Dataset]. https://koordinates.com/layer/96127-boston-massachusetts-neighborhoods/
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    geopackage / sqlite, shapefile, mapinfo tab, pdf, csv, geodatabase, mapinfo mif, dwg, kmlAvailable download formats
    Dataset updated
    Sep 6, 2018
    Dataset authored and provided by
    City of Boston, Massachusetts
    Area covered
    Description

    Geospatial data about Boston, Massachusetts Neighborhoods. Export to CAD, GIS, PDF, CSV and access via API.

  11. A

    DAS/Small Cell Approved Locations

    • data.boston.gov
    • gis.data.mass.gov
    • +3more
    Updated Nov 15, 2024
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    DAS/Small Cell Approved Locations [Dataset]. https://data.boston.gov/dataset/das-small-cell-approved-locations
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    csv, kml, zip, html, shp, geojson, arcgis geoservices rest apiAvailable download formats
    Dataset updated
    Nov 15, 2024
    Dataset authored and provided by
    Boston Maps
    License

    ODC Public Domain Dedication and Licence (PDDL) v1.0http://www.opendatacommons.org/licenses/pddl/1.0/
    License information was derived automatically

    Description

    Locations within the City of Boston of all small cell antenna/DAS approved by the City prior to 01/01/2017

  12. A

    BPDA Neighborhood Boundaries

    • data.boston.gov
    • gis.data.mass.gov
    Updated Nov 12, 2024
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    BPDA Neighborhood Boundaries [Dataset]. https://data.boston.gov/dataset/bpda-neighborhood-boundaries
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    arcgis geoservices rest api, kml, shp, csv, html, geojsonAvailable download formats
    Dataset updated
    Nov 12, 2024
    Dataset authored and provided by
    Boston Maps
    License

    ODC Public Domain Dedication and Licence (PDDL) v1.0http://www.opendatacommons.org/licenses/pddl/1.0/
    License information was derived automatically

    Description

    BPDA Neighborhoods are a combination of zoning neighborhood boundaries, zip code boundaries and 2010 census tract boundaries. These boundaries are used in the broad sense for visualization purposes, research analysis and planning studies. However these boundaries are not official neighborhood boundaries for the City of Boston. The BPDA is not responsible for any districts or boundaries within the City of Boston except for the districts we use for planning purposes.

  13. d

    Data from: Defined Map Units of the seafloor of Boston Harbor and Approaches...

    • catalog.data.gov
    • data.usgs.gov
    • +4more
    Updated Jul 6, 2024
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    U.S. Geological Survey (2024). Defined Map Units of the seafloor of Boston Harbor and Approaches (BOTTOMTYPE, UTM 19, WGS84) [Dataset]. https://catalog.data.gov/dataset/defined-map-units-of-the-seafloor-of-boston-harbor-and-approaches-bottomtype-utm-19-wgs84
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    Dataset updated
    Jul 6, 2024
    Dataset provided by
    United States Geological Surveyhttp://www.usgs.gov/
    Area covered
    Boston Harbor, Boston
    Description

    This data is a qualitatively-derived interpretative polygon shapefile defining the bottom types of the seafloor from Boston Harbor and the harbor approaches, Massachusetts. Approximately 170 km square of sidescan sonar and bathymetric data were collected by the National Oceanic and Atmospheric Administration (NOAA) Ship Whiting in 2000 and 2001 and reprocessed and gridded by the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey (USGS).

  14. a

    Zoning Groundwater Conservation Overlay District (GCOD)

    • arc-gis-hub-home-arcgishub.hub.arcgis.com
    • data.boston.gov
    • +3more
    Updated Aug 28, 2022
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    BostonMaps (2022). Zoning Groundwater Conservation Overlay District (GCOD) [Dataset]. https://arc-gis-hub-home-arcgishub.hub.arcgis.com/maps/boston::zoning-groundwater-conservation-overlay-district-gcod
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    Dataset updated
    Aug 28, 2022
    Dataset authored and provided by
    BostonMaps
    License

    ODC Public Domain Dedication and Licence (PDDL) v1.0http://www.opendatacommons.org/licenses/pddl/1.0/
    License information was derived automatically

    Area covered
    Description

    The City of Boston adopted a Groundwater Conservation Overlay District (GCOD), zoning Article 32, in sections of the City to protect wood pile foundations of buildings from being damaged by lowered groundwater levels. For more information, visit Zoning Code Article 32 | Boston Groundwater Trust | Boston Water and Sewer Commission

  15. A

    Boston Zoning Districts

    • data.boston.gov
    • bostonopendata-boston.opendata.arcgis.com
    • +1more
    Updated Nov 12, 2024
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    Boston Zoning Districts [Dataset]. https://data.boston.gov/dataset/boston-zoning-districts
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    arcgis geoservices rest api, csv, geojson, html, kml, shpAvailable download formats
    Dataset updated
    Nov 12, 2024
    Dataset authored and provided by
    Boston Maps
    License

    ODC Public Domain Dedication and Licence (PDDL) v1.0http://www.opendatacommons.org/licenses/pddl/1.0/
    License information was derived automatically

    Area covered
    Boston
    Description

    This layer represents Zoning District boundaries indicating geographic areas subject to specific zoning guidelines. Developed and maintained by the Planning Department GIS in accordance with the Boston Zoning Code.

  16. m

    School District

    • gis.data.mass.gov
    • hub.arcgis.com
    Updated Apr 27, 2012
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    Town of Brookline, Massachusetts (2012). School District [Dataset]. https://gis.data.mass.gov/maps/a092fa959a714695a9d9f6bc8d681eea
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    Dataset updated
    Apr 27, 2012
    Dataset authored and provided by
    Town of Brookline, Massachusetts
    Area covered
    Description

    View and Download PDF Maps from Map Library School Districts and Buffer Zones (11 X 17)School Districts and Buffer Zones (8.5 X 11)Individual School MapBaker School District and Buffer Zones (22 X 34)Baker School District and Buffer Zones (8.5X 11)Devotion School District and Buffer Zones (22 X 34)Devotion School District and Buffer Zones (8.5 X 11)Driscoll School District and Buffer Zones (22 X 34)Driscoll School District and Buffer Zones (8.5 X 11)Health School District and Buffer Zones (22 X 34)Health School District and Buffer Zones (8.5 X 11)Lawrence School District and Buffer Zones (22 X 34)Lawrence School District and Buffer Zones (8.5 X 11)Lincoln School District and Buffer Zones (22 X 34)Lincoln School District and Buffer Zones (8.5 X 11)Pierce School District and Buffer Zones (22 X 34)Pierce School District and Buffer Zones (8.5 X 11)Runkle School District and Buffer Zones (22 X 34)Runkle School District and Buffer Zones (8.5 X 11)SCHOOL DISTRICTS: This data layer is created by Brookline GIS based upon the street centerline layer developed by Boston Edison and the hard copy school district map provided by the school department.SCHOOL BUFFER ZONES: This data layer is created by Brookline GIS based upon the parcel boundaries and the address list from the school department. Updated on 06/14/2001, 08/27/2002 and 06/16/2004 according to changes made by the School Committee

  17. Boston Feature Layer

    • boston-harbor-resources-bsumaps.hub.arcgis.com
    Updated Apr 9, 2021
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    Ball State University ArcGIS Online (2021). Boston Feature Layer [Dataset]. https://boston-harbor-resources-bsumaps.hub.arcgis.com/maps/795ab250c8b24dd0a17b35b1ce6d659f
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    Dataset updated
    Apr 9, 2021
    Dataset provided by
    Authors
    Ball State University ArcGIS Online
    Area covered
    Description

    This is a base map with multiple feature layers and simple symbology. We created this map to garner the attention of students that are unfamiliar with GIS. We want to highlight the abilities of GIS and it's use in risk analysis.The data shown on this map is meant to service teachers in the EMHS department as a way to engage students in finding areas of interest. There are many simple layers with distinct colors and symbols to make it simple for students to understand. The map shows more layers of detail the more you zoom in.

  18. A

    City Council Districts - 2023-2032

    • data.boston.gov
    • gis.data.mass.gov
    • +1more
    Updated Nov 14, 2024
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    Boston Maps (2024). City Council Districts - 2023-2032 [Dataset]. https://data.boston.gov/dataset/city-council-districts-2023-2032
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    html, kml, csv, arcgis geoservices rest api, zip, geojson, shpAvailable download formats
    Dataset updated
    Nov 14, 2024
    Dataset authored and provided by
    Boston Maps
    License

    ODC Public Domain Dedication and Licence (PDDL) v1.0http://www.opendatacommons.org/licenses/pddl/1.0/
    License information was derived automatically

    Description
    New Boston City Council districts for 2023-2031 municipal elections. Passed by the City Council on May 24th, 2023.
    The City Council Districts data layer reflects Chapter 9 of the Ordinances of 2022.
  19. m

    Massachusetts Shoreline Change Project Map

    • mapthatcapecod.com
    • hub.arcgis.com
    Updated Nov 28, 2022
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    Center for Coastal Studies (2022). Massachusetts Shoreline Change Project Map [Dataset]. https://www.mapthatcapecod.com/maps/24670bfaa3b04632a90122b251c0e365
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    Dataset updated
    Nov 28, 2022
    Dataset authored and provided by
    Center for Coastal Studies
    Area covered
    Description

    This map includes shoreline change data for the state of Massachusetts hosted by the Massachusetts Office of Coastal Zone Management.The active data layer in this map is Massachusetts Shoreline Change Transect (1970-2014) with short-term shoreline change rates. To view long-term rates, open map in Map Viewer to turn on layer.The Massachusetts Office of Coastal Zone Management launched the Shoreline Change Project in 1989 to identify erosion-prone areas of the coast. The shoreline position and change rate are used to inform management decisions regarding the erosion of coastal resources. In 2001, a shoreline from 1994 was added to calculate both long- and short-term shoreline change rates along ocean-facing sections of the Massachusetts coast. In 2013, two oceanfront shorelines for Massachusetts were added using 2008-9 color aerial orthoimagery and 2007 topographic lidar datasets obtained from the National Oceanic and Atmospheric Administration's Ocean Service, Coastal Services Center. In 2018 two new mean high water (MHW) shorelines for Massachusetts were extracted from lidar collected between 2010 and 2014 (described below). 2018 addition shoreline 1The North Shore and South Coast uses 2010 lidar data collected by the U.S. Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise. The South Shore and Outer Cape uses 2011 lidar data collected by the U.S. Geological Survey's (USGS) National Geospatial Program Office. Nantucket and Martha’s Vineyard uses 2012 lidar data collected by the USACE (post Sandy)from a 2012 USACE Post Sandy Topographic lidar survey. 2018 addition shoreline 2The North Shore, Boston, South Shore, Cape Cod Bay, Outer Cape, South Cape, Nantucket, Martha’s Vineyard, and the South Coast (around Buzzards Bay to the Rhode Island Border) is from 2013-14 lidar data collected by the (USGS) Coastal and Marine Geology Program. This 2018 update of the rate of shoreline change in Massachusetts includes two types of rates. Some of the rates include a proxy-datum bias correction, this is indicated in the filename with “PDB”. The rates that do not account for this correction have “NB” in their file names. The proxy-datum bias is applied because in some areas a proxy shoreline (like a High Water Line shoreline) has a bias when compared to a datum shoreline (like a Mean High Water shoreline). In areas where it exists, this bias should be accounted for when calculating rates using a mix of proxy and datum shorelines. This issue is explained further in Ruggiero and List (2009) and in the process steps of the metadata associated with the rates. This release includes both long-term (~150 years) and short term (~30 years) rates. Files associated with the long-term rates have “LT” in their names, files associated with short-term rates have “ST” in their names.

  20. d

    Foreign-born Population in Boston Area Communities, 1870–2010

    • search.dataone.org
    • dataverse.harvard.edu
    Updated Nov 22, 2023
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    Johnson, Marilynn S. (2023). Foreign-born Population in Boston Area Communities, 1870–2010 [Dataset]. http://doi.org/10.7910/DVN/IC42Z8
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    Dataset updated
    Nov 22, 2023
    Dataset provided by
    Harvard Dataverse
    Authors
    Johnson, Marilynn S.
    Time period covered
    Jan 1, 1870 - Jan 1, 2010
    Description

    This dataset underlies a choropleth map of Boston area communities in which areas are shaded according to the percentage of the population that was foreign-born during each decade. The data was drawn from the US Census of Population, as well as the American Community Survey.

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U.S. Geological Survey (2024). Database for the geologic map of the South Boston 30' x 60' Quadrangle, Virginia and North Carolina [Dataset]. https://catalog.data.gov/dataset/database-for-the-geologic-map-of-the-south-boston-30-x-60-quadrangle-virginia-and-north-ca

Database for the geologic map of the South Boston 30' x 60' Quadrangle, Virginia and North Carolina

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Dataset updated
Jul 6, 2024
Dataset provided by
United States Geological Surveyhttp://www.usgs.gov/
Area covered
Virginia, North Carolina, South Boston
Description

The 1:100,000-scale geologic map of the South Boston 30' x 60' quadrangle, Virginia and North Carolina, provides geologic information for the Piedmont along the I-85 and U.S. Route 58 corridors and in the Roanoke River watershed, which includes the John H. Kerr Reservoir and Lake Gaston. The Raleigh terrane (located on the eastern side of the map) contains Neoproterozoic to early Paleozoic(?) polydeformed, amphibolite-facies gneisses and schists. The Carolina slate belt of the Carolina terrane (located in the central part of the map) contains Neoproterozoic metavolcanic and metasedimentary rocks at greenschist facies. Although locally complicated, the slate-belt structure mapped across the South Boston map area is generally a broad, complex anticlinorium of the Hyco Formation (here called the Chase City anticlinorium) and is flanked to the west and east by synclinoria, which are cored by the overlying Aaron and Virgilina Formations. The western flank of the Carolina terrane (located in the western-central part of the map) contains similar rocks at higher metamorphic grade. This terrane includes epidote-amphibolite-facies to amphibolite-facies gneisses of the Neoproterozoic Country Line complex, which extends north-northeastward across the map. The Milton terrane (located on the western side of the map) contains Ordovician amphibolite-facies metavolcanic and metasedimentary gneisses of the Cunningham complex. Crosscutting relations and fabrics in mafic to felsic plutonic rocks constrain the timing of Neoproterozoic to late Paleozoic deformations across the Piedmont. In the eastern part of the map, a 5- to 9-kilometer-wide band of tectonic elements that contains two late Paleozoic mylonite zones (Nutbush Creek and Lake Gordon) and syntectonic granite (Buggs Island pluton) separates the Raleigh and Carolina terranes. Amphibolite-facies, infrastructural metaigneous and metasedimentary rocks east of the Lake Gordon mylonite zone are generally assigned to the Raleigh terrane. In the western part of the map area, a 5- to 8-kilometer-wide band of late Paleozoic tectonic elements includes the Hyco and Clover shear zones, syntectonic granitic sheets, and amphibolite-facies gneisses along the western margin of the Carolina terrane at its boundary with the Milton terrane. This band of tectonic elements is also the locus for early Mesozoic extensional faults associated with the early Mesozoic Scottsburg, Randolph, and Roanoke Creek rift basins. The map shows fluvial terrace deposits of sand and gravel on hills and slopes near the Roanoke and Dan Rivers. The terrace deposits that are highest in altitude are the oldest. Saprolite regolith is spatially associated with geologic source units and is not shown separately on the map. Mineral resources in the area include gneiss and granite quarried for crushed stone, tungsten-bearing vein deposits of the Hamme district, and copper and gold deposits of the Virgilina district. Surface-water resources are abundant and include rivers, tributaries, the John H. Kerr Reservoir, and Lake Gaston. Groundwater flow is concentrated in saprolite regolith, along fractures in the crystalline bedrock, and along fractures and bedding-plane partings in the Mesozoic rift basins.

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