QGIS is open source GIS at it's most user friendly state. GRASS is a more powerful open source GIS suite that's been in development since 1982, but it's lacking in the user interface department. Luckily the two programs work together nicely so you can use QGIS as a frontend to GRASS.
Using QGIS with GRASS to prepare a single Digital Elevation Model(DEM) from the National Elevation Database(NED) downloaded from the Texas Natural Resources Information System(TNRIS).... whew there are so many acronyms.
Preparing this DEM to learn how to use nviz(open source 3d visualization tool)
(to be continued)
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