Description

The USGS Shaded Relief Large service from The National Map (TNM) was 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 of the US. 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). This hillshade is actually five separate shaded relief datasets created from the original terrain data. Each shaded relief has different azimuths and altitude values as follows: 0 45, 135 60, 270 45, 315 45, 45 45. These five datasets are then combined into one feature class using map algebra to compute the raster layers using the following equation (shadedrelief1 + shadedrelief2 + shadedrelief3 + (shadedrelief4 x 2) + shaded relief5 / 6). This equation gives double importance to the 315 degrees azimuth and 45 degrees altitude. Color characteristics are the result of applying a color ramp in which RGB values range from near-white (RGB: 255, 255, 252) to brown (RGB: 156, 142, 107). The color ramp was applied with a stretch type of 4.3 standard deviations, since the scale of brightness values range from 130 to 1240. Contrast (24 percent) and brightness (3 percent) enhancements were applied for cartographic purposes. For additional information on the NED, go to http://ned.usgs.gov.

General Information

• This data is described at

  http://catalog.data.gov/dataset/usgs-shaded-relief-large-scale-base-map-service-from-the-national-map Do you think this data is incorrect? Let us know

• This data is published by

  U.S. Geological Survey, Department of the Interior Do you think this data is incorrect? Let us know

Legal Information

• The rights statement is at

  http://catalog.data.gov/dataset/usgs-shaded-relief-large-scale-base-map-service-from-the-national-map Do you think this data is incorrect? Let us know

• Outside the US, this data is available under

  Creative Commons CCZero Do you think this data is incorrect? Let us know

• There are

  yes, and the rights are all held by the same person or organisation Do you think this data is incorrect? Let us know

• The content is available under

  Creative Commons CCZero Do you think this data is incorrect? Let us know

• This data contains

  no data about individuals Do you think this data is incorrect? Let us know

Practical Information

• The data appears in this collection

  http://catalog.data.gov/organization/usgs-gov Do you think this data is incorrect? Let us know

• This data changes

  no Do you think this data is incorrect? Let us know

• The data is

  backed up offsite Do you think this data is incorrect? Let us know

Technical Information

• Releases of this data are listed at

  http://catalog.data.gov/api/rest/package/usgs-shaded-relief-large-scale-base-map-service-from-the-national-map Do you think this data is incorrect? Let us know

• This data is

  machine-readable Do you think this data is incorrect? Let us know

• The format of this data is

  a standard open format Do you think this data is incorrect? Let us know

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• Find out how to contact someone about this data at

  http://catalog.data.gov/dataset/usgs-shaded-relief-large-scale-base-map-service-from-the-national-map Do you think this data is incorrect? Let us know

• Find out how to suggest improvements to publication at

  http://www.data.gov/issue/?media_url=http://catalog.data.gov/dataset/usgs-shaded-relief-large-scale-base-map-service-from-the-national-map Do you think this data is incorrect? Let us know