Alaska Geodetic Control Files; USGS
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下载链接：
https://cmr.earthdata.nasa.gov/search/concepts/C2231552547-CEOS_EXTRA.html
下载链接
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资源简介：
Positional (horizontal) central data and elevational
(vertical) control data for the state of Alaska. Data may
include description of control points and 'to-reach' information.
It is issued in 1/2 ' or 15 ' quads, states, and the 1:250,000 topographic
series. These maps are not yet available in digital form.
提供机构：
CEOS_EXTRA
