GRASS Vectors

SSURGO cutaway

Slope class cutaway

Topomap

Panchromatic

Near infrared

Geomorphic features.

View of Mt. Defiance from Bear Valley, Pinnacles National Monument. Pan Chromatic 2m res.

Thanks to Markus Neteler for initial insight on how to build an appropriate POVRAY script file.

Initial Landform

10 Iterations

100 iterations of mass removal based on preferential flow of water as calculated by r.topidx in GRASS. Notice how landform is cutdown most in stream channels, least at the ridges. The basins between ridges appear to "fill" with sediment near the 50th iteration as the entire landform is lowered to sea level (0m). Absolute change in elevation is visble in the elevation profiles below. Example GRASS commands below. Here is a link to a movie, containing all 100 iterations.

Figure 1

The California Department of Water Resources provides public access to their groundwater level and quality databases here. Point data (well locations) associated with groundwater levels can be downloaded in the form of a text file, which can then be input into the GIS/mapping application of choice. Simple UNIX text programs were used to extract geographic coordinates and groundwater level, and imported into GRASS GIS with the command v.in.ascii. Pre-computer groundwater contours can also me downloaded from the Water Resources webpage.

Insolation duration on solar day 100, near Machete Ridge, Pinnacles National Monument.
Note the occurance of regions of less than 7 hours of sunlight on day 100.

Less than 7 hours	Less than 8 hours