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Posts Tagged ‘Topographic’

Washington DC Historic Maps

January 11th, 2010 No comments

This is a collection of historic maps and birds eye images of Washington DC during the late 1800s and early 1900s.  The collection includes 58 highly-detailed topographic maps that appear to have been completed in the 1870s and 1880s of the outlying areas of Washington DC.  These were a bit tricky to georeference, but they turned out to be amazingly accurate given the time period in which they were originally surveyed.  The topographic maps show the locations of buildings, military installations, horse race tracks, etc, as well as general land use.

The birds eye images have been placed in the approximate location of the original artist’s perspective.  These are very high resolution images so go ahead and zoom in to see all the detail.

All of the maps and images are about 3-5 megabytes and may take a minute or two to load.  The following maps/images are included.

  • 58 topographic maps from the 1870s/1880s (from NOAA Historic Maps)
  • 1792 plan of Washington DC (from NOAA Historic Maps)
  • 1851 map of Washington DC (from David Rumsey Historic Maps)
  • 1861 map of Washington DC (from David Rumsey Historic Maps)
  • 1871, 1883, 1888, 1916, and 1923 Birds Eye images from various locations around Washington DC (from Library of Congress)

Washington DC Maps

Washington DC Maps

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Credits

Google Earth Library

David Rumsey Map Collection

NOAA Historic Maps

Library of Congress American Memory Collection

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National Elevation Dataset

December 19th, 2009 No comments

The National Elevation Dataset (NED) contains detailed elevation data for the United States and Territories. The NED comes in three different versions.

1 and 2 Arc-Second – This version has a resolution of approximately 30 meters (60 meters for Alaska) and covers all of the United States and Territories.

1/3 Arc-Second – This version has a resolution of approximately 10 meters and covers a large portion of the Continental US only. This is more detailed than the 1 and 2 Arc-Second version.

1/9 Arc-Second – This version has a resolution of approximately 3 meters and covers only a small area of the Continental US. This is the most detailed data and is obtained from laser radar (LIDAR). This elevation data is accurate enough to make out structures and road footprints.

More information regarding the three versions can be found here.

To access the NED data, simply open the file beneath the screenshots. Then select the version you want to view. You will need to manually navigate to the area of interest or you might get a red X on the screen. Also, some of the layers will not be visible if you are not zoomed in close enough to the Earth’s surface.

National Elevation Dataset

National Elevation Dataset

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Credits

Google Earth Library

USGS

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