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3.0 TNM Base Maps

The National Map maintains a series of composite base maps which combine thematic data layers into tile cache services to offer the simplicity of single service base maps with the richness of multiple data sources. TNM base maps are visible from world scale up to 1:18,000. Viewing at scales larger than 1:18,000 is also available when these "Primary Tile Cache" base maps are used with their accompanying "Below 18K Scale Dynamic" services. Both sets of base map URLs (or service endpoints) can be found in our Services List. The National Map strives to update content of these tile cache and dynamic base maps on an annual basis.

USGS Topo

USGS Topo Base Map

USGS Topo is a topographic tile cache base map that combines the most current data (Boundaries, Names, Transportation, Elevation, Hydrography, Land Cover, and other themes) that make up The National Map. Contours generated for US Topo products are visible at larger scales. This product is designed to provide a seamless view of the data, closely resembling The National Map's US Topo (GeoPDF) products at large scales, in a GIS accessible format.

Service URL: http://basemap.nationalmap.gov/arcgis/rest/services/USGSTopo/MapServer

USGS ImageryOnly

USGS ImageryOnly Base Map

USGS Imagery Only is a tile cache base map of orthoimagery in The National Map. Orthoimagery data typically are high resolution aerial images that combine the visual attributes of an aerial photograph with the spatial accuracy and reliability of a planimetric map. USGS digital orthoimage resolution may vary from 6 inches to 1 meter. In the former resolution, every pixel in an orthoimage covers a six inch square of the earth's surface, while in the latter resolution, one meter square is represented by each pixel. Blue Marble: Next Generation and Landsat imagery data sources are displayed at small to medium scales, however, the majority of imagery service source is from the National Agriculture Imagery Program (NAIP) for the conterminous United States. The data is 1-meter pixel resolution with "leaf-on". Collection of NAIP imagery is administered by the U.S. Department of Agriculture's Farm Service Agency (FSA). In areas where NAIP data is not available, other imagery may be acquired through partnerships by the USGS. The National Map Program is working on acquisition of high resolution imagery for the States of Alaska and Hawaii. However, for the most part, any new Alaska orthoimagery data will not be available in this service due to license restrictions.

Service URL: http://basemap.nationalmap.gov/arcgis/rest/services/USGSImageryOnly/MapServer

USGS ImageryTopo

USGS ImageryTopo Base Map

USGS Imagery Topo is a topographic tile cache base map with orthoimagery as a backdrop, and combines the most current data (Boundaries, Names, Transportation, Elevation, Hydrography, and other themes) that make up The National Map. Contours generated for US Topo products are visible at larger scales. This product is designed to provide a seamless view of the data, closely resembling The National Map's US Topo (GeoPDF) products at large scales, in a GIS accessible format. Orthoimagery data are typically high resolution aerial images that combine the visual attributes of an aerial photograph with the spatial accuracy and reliability of a map. USGS digital orthoimage resolution may vary from 6 inches to 1 meter. In the former resolution, every pixel in an orthoimage covers a six inch square of the earth's surface, while in the latter resolution, one meter square is represented by each pixel. Blue Marble: Next Generation and Landsat imagery data sources are displayed at small to medium scales, however, the majority of the imagery service source is from the National Agriculture Imagery Program (NAIP) for the conterminous United States. The data is 1-meter pixel resolution with "leaf-on". Collection of NAIP imagery is administered by the U.S. Department of Agriculture's Farm Service Agency (FSA). In areas where NAIP data is not available other imagery may be acquired through partnerships by the USGS. The National Map Program is working on acquisition of large scale imagery for Alaska and Hawaii. However, for the most part, any new Alaska orthoimagery data will not be available in this service due to license restrictions.

Service URL: http://basemap.nationalmap.gov/arcgis/rest/services/USGSImageryTopo/MapServer

Hydro-NHD

USGS ImageryOnly Base Map

USGS Hydro-NHD is a tile cache base map that combines hydrography data in The National Map from the National Hydrography Dataset (NHD) along with the Watershed Boundary Dataset (WBD). The NHD is a comprehensive set of digital spatial data that encodes information about naturally occurring and constructed bodies of surface water (lakes, ponds, and reservoirs), paths through which water flows (canals, ditches, streams, and rivers), and related entities such as point features (springs, wells, stream gages, and dams). The information encoded about these features includes classification and other characteristics, delineation, geographic name, position and related measures, a "reach code" through which other information can be related to the NHD, and the direction of water flow. The network of reach codes delineating water and transported material flow allows users to trace movement in upstream and downstream directions. In addition to this geographic information, the dataset contains metadata that supports the exchange of future updates and improvements to the data. The NHD supports many applications, such as making maps, geocoding observations, flow modeling, data maintenance, and stewardship. For additional information on NHD, go to http://nhd.usgs.gov/. The Watershed Boundary Dataset (WBD) is a companion dataset to the NHD. It defines the perimeter of drainage areas formed by the terrain and other landscape characteristics. Drainage areas are nested within each other so that a large drainage area, such as the Upper Mississippi River, will be composed of multiple smaller drainage areas, such as the Wisconsin River. Each of these smaller areas can be further subdivided into smaller and smaller drainage areas. The WBD uses six different levels in this hierarchy, with the smallest averaging about 30,000 acres. The WBD is made up of polygons nested into six levels of data, respectively defined by Regions, Subregions, Basins, Subbasins, Watersheds, and Subwatersheds. For additional information on WBD, go to http://nhd.usgs.gov/wbd.html.

Service URL: http://services.nationalmap.gov/arcgis/rest/services/USGSHydroNHDLarge/MapServer

Hill Shade

Hill Shade Base Map

USGS Hill Shade (or Shaded Relief) is a tile cache base map created from the National Elevation Dataset (NED), a seamless dataset of best available raster elevation data for the conterminous United States, Alaska, Hawaii, and Territorial Islands. Derived from the NED using a hill shade technique, this base map represents a continental view showing shaded relief from USGS NED layers at resolutions of 1/3-, 1-, and 2-arc-second (in Alaska only). Shaded relief (or hill shade) function parameters are: point illumination is from the NW (azimuth = 315 degrees), and altitude of the light source is 45 degrees. Color characteristics are the result of applying a color ramp in which RGB values range from white (RGB: 255, 255, 255) to brown (RGB: 166, 150, 109). The color ramp was applied with a Stretch Type of None. Contrast and Brightness values range from 4-14%, depending on scale, for cartographic purposes. For additional information on NED, go to http://ned.usgs.gov.

Service URL: http://basemap.nationalmap.gov/arcgis/rest/services/USGSShadedReliefOnly/MapServer

Blank

Blank Base Map

This service consists of ocean tints to give the outline of the US as an empty base map for addition of other services.

Service URL: http://services.nationalmap.gov/arcgis/rest/services/TNM_Blank_US/MapServer

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