Geomorphometry Analysis

New DEM must be open and associated with the map. (requires geomorphometry menu choices be set)

Options; the parameters available for each vary slightly.

Create derivative grid. This includes point transformations, computations for the point and its eight neighbors (slope, curvature, and so on), and computations that require a region about it point (moments, openness). This will be done for every point in the DEM.
Create database on a grid. You will pick the size of the region for the computations (as this goes up, the values do not change much over small distance), and the spacing for the center points at which the computations are done. This could be turned into a grid, with the resolution center point spacing. This could be faster than creating a derivative grid.
Create database for area shapefiles. The sampling size will be the size of each record, and thus vary from record to record.
Create database for point shapefiles. You pick a region sampling size

Open

Basic
- Elevation-slope-aspect plot: calculates statistics and a number of graphs.
- Elevation histograms: provide a series of graphs with each DEM done separately.
- Quick Elev histogram: each DEM done separately
- Aspect distribution by slope.
- Moment Report--can also can histograms, with all DEMs on the same graph
SSO
- SSO (Statistical Slope Orientation) Diagram: slope and aspect should be interpreted together using three dimensional vector statistics.
  - Plot poles (normals): slope and aspect should be interpreted together using three dimensional vector statistics.
  - Plot downhill directions: Jordan (2003) suggested this modification. This plot clearly shows the overabundance of aspect at 45° intervals for shallow slopes.
- Fabric wavelength/height
Advanced
- Geomorphometrics by block
- Graph parameter by region size
- Point classification
- TRI/TPI: if you have the other programs (GDAL, WhiteBox, SAGA, GRASS) set up where MICRODEM can find them, creates a dozen maps.
- Compare SSO by region
- Compare openness by region
Fractal
Surfaces
- Trend surface
- Compare trend surfaces: creates trend surface of orders 1 to 8, and summary table
Algorithm
- Compare slope algorithms
- Slope region size
- Compare all slope algorithms
- Compare Aspect Algorithm: show aspect distribution with multiple algorithms
- Compare sampling for moments
Defaults
- Slope algorithm
- Slope categories
- Reset defaults

Bottom panel
- Pick either the entire DEM, or the area of the current map, for the analysis.
- Do the analysis for Selected open DEMs, or just a single one
- Close this form after performing an operation
- Stat sampling increment

Location of other geomorphometric analysis

Database operations

Plot: plot selected records on the map
Stats: perform statistical operations (not map based) on the database.
Edit: you must enable this option in the program defaults, and with the checkbox, because any changes you make are permanent.

Last revision 2/5/2023