USGS 3DEP Elevation - 30 m
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https://wri-data-catalogue-worldresources.hub.arcgis.com/maps/0383ba18906149e3bd2a0975a0afdb8e
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资源简介：
This dynamic elevation layer provide access to USGS 30 m elevation data to use in analysis and visualizations. It is compiled from USGS 3DEP seamless 1 arc-second data and covers U.S., Canada and Mexico. It is typically updated annually.
创建时间：
2013-07-05
