![]() The file were after is a "disc Image" file that is best processed through a GIS (geographic information system) program. ![]() The 1/9 AS downloads as a folder containing several files. The 1 and 1/3 ArcSecond Dem's download as TIFF files. These PDF's are composed of layers that can be isolated and saved as images.streets,contour lines, hydrology etc.ĭEM's (digital elevation model) come in several sizesġ/9 ArcSecond DEM's provide obviously the greatest detail.that's what were after,īut our quest for detail requires some additional work. The GeoPDF's (requires Acrobat Reader) are excellent maps that can be stitched together to form your overlay maps (usually requires around 4) while retaining excellent detail. is completely free but does require registration before you can download files. This site contains a multitude of assets for creating maps.
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