More items often make the list than you really need. To demonstrate how this process works I have chosen the area around Newport Oregon requiring just 4 DEM's to produceĪfter you have drawn a perimeter and made your selection of items, click 'Search Products', on the Products Tab you will find items that pertain to your selection and can be directly downloaded from there. SwissTopo (link below) The Swiss DEM's have a very small footprint, that map required almost 600 individual DEM's to produce, so it didn't make a very good candidate for demonstration purposes.just too complex! The Map Depicted above was produced with DEM's from The following are 5 cards that demonstrate downloading the DEM files.

Qgis is a completely free program that looks and functions in a very similar manner This guide details using ESRI ArcGis Pro which cost $100 per year for individuals. Without processing and opening a disc image file is not all that straight forward. They have to be opened and merged.edges don't match 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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