Subdivides the sites of a basin in 11 topographic classes, nine of which are defined according to the program TC.
Such classes are the nine classes based obtained with
[Tc] ; the points belonging to the channel networks constitute a tenth class (derived from the use of
ExtractNetwork), the points with high slope (higher than a critical angle) the eleventh class.
Inputs
- The !GridCoverage containing the slopes, obtained with [Slope] or [Gradient];
- The !GridCoverage containing the channel network, obtained with [ExtractNetwork];
- The !GridCoverage containing the subdivisions in curvature classes, obtained with [Tc];
Outputs
- The !GridCoverage containing the subdivision in the 11 predefined classes;
- The !GridCoverage of the aggregated classes (hillslope, valleys and net);
Notes
Differently from the program TC, the program GC considers also the existence of the channel net,
which is extracted from the DEM. The channel net is thought as a topologically connected network,
even though it is known that this cannot be the real case.
The cases are identified as in TC plus:
- 100 → channel sites (individuated by extract network)
- 110 → unconditionally unstable sites (slope > critic value)
The second output file contains an aggregation of these classes in the four fundamentals, indexed as
follows:
- 15 → non-channeled valley sites (classi 70, 90, 30 )
- 25 → planar sites (classi 10)
- 35 → channel sites (classe 100)
- 45 → hillslope sites (classi 20, 40, 50, 60, 80)
References
- [Bibliography#17, 17] A. Parsons, 1988
- [Bibliography#18, 18] R. Suzuki, 1977