Color Shaded Relief Map of the Conterminous United States
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https://cmr.earthdata.nasa.gov/search/concepts/C2231549569-CEOS_EXTRA.html
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资源简介：
The color shaded relief map of the conterminous U.S. was created from 15
arc-second digital elevation model (DEM) data. The data set traces its origins
back to the early 1960's when .01 inch scans of 1:250,000 USGS topographic
sheets were produced by the Defense Mapping Agency and converted to 3 second
data by the USGS National Cartographic Information Center. The 15 second grid
cell data (Michael Webring, written communication) used in this report dates
from the mid-1980's with occasional local and regional updates. The 3 second
grid nodes were averaged with a 6x6 operator and decimated to 15 second grid
cells which is about the resolution of the original .01 inch data set. The 3
second data is available as 950 separate 1x1 degree quadrangles from the USGS
EROS Data Center.
Additional information available at
"http://pubs.usgs.gov/of/of99-011/1readme.html"
[Summary provided by the USGS.]
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提供机构：
CEOS_EXTRA
