Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and other selected map features. This map depicts geographic features on the surface of the earth. One intended purpose is to support emergency response at all levels of government. The geospatial data in this map are from selected National Map data holdings and other government sources.This is a MD iMAP hosted service layer. Find more information at https://imap.maryland.gov.Feature Service Layer Link:https://mdgeodata.md.gov/imap/rest/services/Elevation/MD_USGSTopoQuads/MapServer/0

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This dataset contains digitized land use/land cover (LULC) for the years 2011, 2015, and 2017. The dataset contains 1-meter resolution raster maps for each year covering the geographic area for six watersheds within and near the Clarksburg Special Protection Area located in Montgomery County, Maryland, USA. The area includes LULC within 500-foot buffered watersheds. Watershed boundaries for Cabin Branch (CB), Crystal Rock (CR), Soper Branch (SB), Tributary 104 (T104), and Tributary 109 (T109) were derived using USGS topographic maps (1:24,000-scale) while Ten Mile Creek (TMC) was derived using Montgomery County, Maryland LiDAR data (1-meter resolution). LULC classes include a water class (10), impervious surface class (20), barren class (30), forest class (40), grass class (70), and agriculture class (80).

This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. This data layer contains the Province-level physiographic subdivisions of Maryland in ArcGIS format. The file was developed from components of a detailed digital physiographic map of Maryland by James P. Reger and Emery T. Cleaves - currently in progress. Physiography is the study and classification of the natural landscape of the earth and the landforms that comprise it. The approach for the detailed physiographic map of Maryland is hierarchical and descriptive. Subdivisions are based on similarities (within) and differences (among) geologic structure - rock type - geomorphic history - and topographic characteristics. Data and subdivisions were compiled at a 1:100 - 000 scale for the detailed state-wide map. The hierarchical classification of the detailed physiographic map (in progress) includes subdivisions as follows - in descending order (and generally decreasing size): Province - Section - Region - District - Area. In Maryland there are portions of five physiographic Provinces. In this file - the polygons reflect Province level subdivision. The polygon feature attribute table has been developed to pertain only to the Provinces level. The table includes information on dominant rock types - geologic structure - topographic relief - and drainage pattern.Physiography is the study and classification of the natural landscape of the earth and the landforms that comprise it. The approach for the detailed physiographic map of Maryland is hierarchical and descriptive. Subdivisions are based on similarities (within) and differences (among) geologic structure - rock type - geomorphic history - and topographic characteristics. Data and subdivisions were compiled at a 1:100 - 000 scale for the detailed state-wide map. The hierarchical classification of the detailed physiographic map (in progress) includes subdivisions as follows - in descending order (and generally decreasing size): Province - Section - Region - District - Area. In Maryland there are portions of five physiographic Provinces. In this file - the polygons reflect Province level subdivision. The polygon feature attribute table has been developed to pertain only to the Provinces level. The table includes information on dominant rock types - geologic structure - topographic relief - and drainage pattern. Last Updated: Feature Service Layer Link: https://mdgeodata.md.gov/imap/rest/services/Geoscientific/MD_Geology/MapServer ADDITIONAL LICENSE TERMS: The Spatial Data and the information therein (collectively "the Data") is provided "as is" without warranty of any kind either expressed implied or statutory. The user assumes the entire risk as to quality and performance of the Data. No guarantee of accuracy is granted nor is any responsibility for reliance thereon assumed. In no event shall the State of Maryland be liable for direct indirect incidental consequential or special damages of any kind. The State of Maryland does not accept liability for any damages or misrepresentation caused by inaccuracies in the Data or as a result to changes to the Data nor is there responsibility assumed to maintain the Data in any manner or form. The Data can be freely distributed as long as the metadata entry is not modified or deleted. Any data derived from the Data must acknowledge the State of Maryland in the metadata.

Maryland geology maps for educational use. Includes geology mapped by formation, by rock class, and by era. Also includes topographic maps, map of major mountains in Maryland, to see how rock units affect topography, physiographic provinces for MD and the US, state and local park boundaries, and watersheds at 3 levels (6-digit, 8-digit, and 12-digit).

The data contained in these files are hydrographic and topographic data collected by the SHOALS-1000T system along the Delaware, Maryland, New Jersey, New York, North Carolina and Virginia coastline as part of the National Coastal Mapping Program. The lidar data for DE, MD, NJ and VA was collected from 20050824-20050908. The lidar data for NY and NC was collected from 20051001-20051126.

Origin...

This dataset represents computer generated intermediate contours at an interval of 2'. Feature capture rules: Intermediate Contours- Contour lines at the 2-foot interval. Intermediate Depression- Depression contour lines at the 2-foot interval Intermediate Indefinite - Intermediate contours obscured by vegetation, shadows or tall structures. Also includes contours in areas under disturbance Intermediate Depression Indefinite- Depression intermediate contours obscured by vegetation, shadows or tall structures Intermediate Hidden Contour lines behind index labels or inside buildings or bridges. Intermediate Hidden Depression - Contour Depression lines behind index labels or inside buildings or bridges. Intermediate Hidden Indefinite - Contour lines behind index labels or inside buildings or bridges and obscured by vegetation, shadows or tall structures. Intermediate Hidden Depression - Indefinite Contour depression lines behind index labels or inside buildings or bridges and obscured by vegetation, shadows or tall structures. Intermediate Non-Contour - Intermediate contours that fall in building structures and are estimated by the surrounding dtm. Intermediate Depression - Non-Contour Intermediate depression contours that fall in building structures and are estimated by the surrounding dtm. To leave feedback or ask a question about this dataset, please fill out the following form: Contours 2ft feedback form.

Layered GeoPDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and other selected map features.

This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. This file (SWSUB8) is a statewide digital watershed file. It depicts the State with 138 separate watersheds each with an 8-digit numeric code. The file was created primarily for State and Federal agency use. The creation of this file goes back many years and involved several State and Federal agencies. This file was derived from a more detailed watershed file (Maryland's Third-Order Watershed). The process used to create this file is consistent with the elevation contour information found on the US Geological Survey's 7.5 minute topographic quadrangle maps and the Maryland Department of the Environment's watershed location and naming conventions. This file is similar - but not identical - to the US Natural Resources Conservation Service's (NRCS) Hydrologic Unit Code (HUC11) watershed file. The watersheds define Strahler (Strahler 1952 p.1120) third order stream drainage by contours on U.S. Geological Survey (USGS) 7.5 minute quadrangle map sheets. Some watershed drainage areas were defined for streams less than third order and some large area Watersheds were split to maintain a maximum size of 15 - 000 acres. Feature Service Layer Link: https://mdgeodata.md.gov/imap/rest/services/Hydrology/MD_Watersheds/FeatureServer ADDITIONAL LICENSE TERMS: The Spatial Data and the information therein (collectively "the Data") is provided "as is" without warranty of any kind either expressed implied or statutory. The user assumes the entire risk as to quality and performance of the Data. No guarantee of accuracy is granted nor is any responsibility for reliance thereon assumed. In no event shall the State of Maryland be liable for direct indirect incidental consequential or special damages of any kind. The State of Maryland does not accept liability for any damages or misrepresentation caused by inaccuracies in the Data or as a result to changes to the Data nor is there responsibility assumed to maintain the Data in any manner or form. The Data can be freely distributed as long as the metadata entry is not modified or deleted. Any data derived from the Data must acknowledge the State of Maryland in the metadata.

Layered GeoPDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and other selected map features.

Layered GeoPDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and other selected map features.

description: This is statewide digital watershed data. This file depicts the State with 138 separate watersheds each with an 8-digit numeric code. This file was created primarily for State and Federal agency use. The creation of this file goes back many years and involved several State and Federal agencies. This file was derived from a more detailed watershed file (Maryland's Third-Order Watershed). The U.S. Natural Resources Conservation Service (NRCS) redefined the third order watersheds creating the HUA14 file. The process used to create this file is consistent with the elevation contour information found on the US Geological Survey's 7.5 minute topographic quadrangle maps and the Maryland Department of the Environment's watershed location and naming conventions. This file is similar, but not identical, to the US Natural Resources Conservation Service's (NRCS) Hydrologic Unit Code (HUC11) watershed file. The watersheds define Strahler (Strahler 1952 p.1120) third order stream drainage by contours on U.S. Geological Survey (USGS) 7.5 minute quadrangle map sheets. Some watershed drainage areas were defined for streams less than third order and some large area Watersheds were split to maintain a maximum size of 15,000 acres. This watershed data is used by many state and local government agencies to accurately locate and report many landscape activities by watershed in Maryland.; abstract: This is statewide digital watershed data. This file depicts the State with 138 separate watersheds each with an 8-digit numeric code. This file was created primarily for State and Federal agency use. The creation of this file goes back many years and involved several State and Federal agencies. This file was derived from a more detailed watershed file (Maryland's Third-Order Watershed). The U.S. Natural Resources Conservation Service (NRCS) redefined the third order watersheds creating the HUA14 file. The process used to create this file is consistent with the elevation contour information found on the US Geological Survey's 7.5 minute topographic quadrangle maps and the Maryland Department of the Environment's watershed location and naming conventions. This file is similar, but not identical, to the US Natural Resources Conservation Service's (NRCS) Hydrologic Unit Code (HUC11) watershed file. The watersheds define Strahler (Strahler 1952 p.1120) third order stream drainage by contours on U.S. Geological Survey (USGS) 7.5 minute quadrangle map sheets. Some watershed drainage areas were defined for streams less than third order and some large area Watersheds were split to maintain a maximum size of 15,000 acres. This watershed data is used by many state and local government agencies to accurately locate and report many landscape activities by watershed in Maryland.

Layered GeoPDF 7.5 Minute Quadrangle Map. Layers of geospatial data include orthoimagery, roads, grids, geographic names, elevation contours, hydrography, and other selected map features.

The watershed data set contains areas of land that contribute runoff and groundwater into a specific stream system. This data set shows the Baltimore County portion of the State-defined Maryland "8-digit" watersheds*. There are 14 major watersheds in Baltimore County. The data was interpreted from Baltimore County's 1953 topographic maps and was delineated at 1:2400 scale.

*These features are not identical to the State-defined Maryland "8-digit" watersheds. The features were refined using 1953 topographic data and a larger delineation scale.

Version 10.0 of these data are part of a larger U.S. Geological Survey (USGS) project to develop an updated geospatial database of mines, mineral deposits, and mineral regions in the United States. Mine and prospect-related symbols, such as those used to represent prospect pits, mines, adits, dumps, tailings, etc., hereafter referred to as “mine” symbols or features, have been digitized from the 7.5-minute (1:24,000, 1:25,000-scale; and 1:10,000, 1:20,000 and 1:30,000-scale in Puerto Rico only) and the 15-minute (1:48,000 and 1:62,500-scale; 1:63,360-scale in Alaska only) archive of the USGS Historical Topographic Map Collection (HTMC), or acquired from available databases (California and Nevada, 1:24,000-scale only). Compilation of these features is the first phase in capturing accurate locations and general information about features related to mineral resource exploration and extraction across the U.S. The compilation of 725,690 point and polygon mine symbols from approximately 106,350 maps across 50 states, the Commonwealth of Puerto Rico (PR) and the District of Columbia (DC) has been completed: Alabama (AL), Alaska (AK), Arizona (AZ), Arkansas (AR), California (CA), Colorado (CO), Connecticut (CT), Delaware (DE), Florida (FL), Georgia (GA), Hawaii (HI), Idaho (ID), Illinois (IL), Indiana (IN), Iowa (IA), Kansas (KS), Kentucky (KY), Louisiana (LA), Maine (ME), Maryland (MD), Massachusetts (MA), Michigan (MI), Minnesota (MN), Mississippi (MS), Missouri (MO), Montana (MT), Nebraska (NE), Nevada (NV), New Hampshire (NH), New Jersey (NJ), New Mexico (NM), New York (NY), North Carolina (NC), North Dakota (ND), Ohio (OH), Oklahoma (OK), Oregon (OR), Pennsylvania (PA), Rhode Island (RI), South Carolina (SC), South Dakota (SD), Tennessee (TN), Texas (TX), Utah (UT), Vermont (VT), Virginia (VA), Washington (WA), West Virginia (WV), Wisconsin (WI), and Wyoming (WY). The process renders not only a more complete picture of exploration and mining in the U.S., but an approximate timeline of when these activities occurred. These data may be used for land use planning, assessing abandoned mine lands and mine-related environmental impacts, assessing the value of mineral resources from Federal, State and private lands, and mapping mineralized areas and systems for input into the land management process. These data are presented as three groups of layers based on the scale of the source maps. No reconciliation between the data groups was done.

ESRI shape file for Maryland physiographic provinces. This file is projected in the Maryland State Plane Coordinate System (Lambert conformal conic projection, NAD83, meters). Data in this file were compiled at a 1:100,000 scale as part of a digital map (to be available in print/PDF version at 1:250,000).

This dataset contains digitized land use/land cover (LULC) polygons for years between 1998 and 2013 for six watersheds within and near the Clarksburg Special Protection Area located in Montgomery County, Maryland, USA. Each polygon is representative of the LULC for a specific year within 500-foot buffered watersheds. Watershed boundaries for Cabin Branch (CB), Crystal Rock (CR), Soper Branch (SB), Tributary 104 (T104), and Tributary 109 (T109) were derived using USGS topographic maps while Ten Mile Creek (TMC) was derived using Montgomery County, Maryland LiDAR data. The Habitat Digitizer Extension add-in from NOAA for ArcMap was used to customize a hierarchical classification scheme to attribute polygons delineated by visually interpreting aerial imagery and orthoimagery taken during tree leaf-off season.

The Maryland county boundaries were built using the USGS Topo Quads, county boundaries from the county governments, monument points, and historic records from the Maryland Archive. This layer has been dissolved from the County Boundaries layer.This is a MD iMAP hosted service. Find more information at https://imap.maryland.gov.Feature Service Link:https://mdgeodata.md.gov/imap/rest/services/Boundaries/MD_PoliticalBoundaries/FeatureServer/0

Land use for long-term Rhode River study watersheds. Used ARC/INFO to trace land use patches from 1984 1:2400 b/w aerial photos. The resulting coverage was geographically referenced using control points from 1:2400 topographic maps. The photos and maps were both obtained from the Anne Arundel County Office of Planning and Zoning. Updated the coverage from 1991 ARCINFO land use coverage and 1993 color slides. Verified land use in all patches observable on the ground.

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