Terrain Analyses

From terrain analyses, I learned basic terrain analysis functions, including watershed, viewshed, and profile processing.

Elevation data, also known as terrain data, are import for many kinds of analysis, and are available in many forms, from many sources and resolutions.

Although the most common use of DEMs is as shaded relief background for maps, I often are interested in working with terrain data – calculating slopes, aspects, steepness or slope along profiles, viewsheds, as well as watershed and other hydrologic functions. The readings and lectures describe some of these applications, and this set of exercises introduces them.

I completed two projects here, using the same basic data. The first project has two parts, first comparing DEM raster data sets from 2 time periods; a 30 meter data set from the USGS and produced in the late 1980s, and a 3 meter data set from LiDAR data collected about 2006. Then I used the LiDAR DEM to explore profile and viewshed tools. My second project focused on watershed processing, using the ArcGIS Hydrology tools.


Driftlessarea



Watershed




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