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Products
eTOPO
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eTOPO
Digital
topographic raster maps add a crucial layer of information to any application.
City names, political boundaries, highways and hydrographic features are
all clearly annotated, giving a cultural context to your GIS data. i-cubed's eTOPO product are derived from Digital Raster Graphics (DRGs) that are scanned images of USGS paper topographic maps. The maps were scanned at 250 dpi, the collars were then clipped off creating a seamless mosaic of the conterminous United States. They have been reprojected to NAD83 (although are available in the projection of your choice). Three scales of eTOPO USA are available; 1;24,000, 1:100,000 and 1:250,000. Similar to eSAT15, i-cubed also offers a 3D hill-shaded version of this product, created by fusing the DRG with a shaded relief DEM.
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