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The panels shown will depend on which options you have checked at the top of the
form.
- Elevations: Select the minimum and maximum
elevations in meters, with indication below of the
equivalent values in feet, and the percentiles within the DEM.
- Slopes: Select slopes in percentages, and the
program will display the corresponding slope angle in
degrees to assist in your selection.
- Relief: relief is the difference in elevation
between the highest and lowest point within a specified
radius of the point. The radius actually defines a square
centered on the point.
- Aspect: aspect is the downhill direction. You can
select any combination of aspects. (aspect
maps)
- Color: Select colors for the
categories that contrast with the map display. This will
probably show up best on reflectance contour maps, or
single band imagery.
- IHS color merge: to let the terrain peek through. Pick a
pastel color for this. This selection affects basin flooding.
- PLOT button draws the map.
- Add category
- Export grid: in the new grid, all points that in the category will have
a single value. This is designed to only work with a single category.
- Export DB: for elevation maps only, every point in the category will be
a record in the DB. This is designed to only work with a single category,
and the resulting database could be very large.
- Masking by category. This allows edits of the DEM
based on category membership. This will be in memory; to save, you must save
the DEM. Reload the DEM to undo the mask.
- Mask cat in: in the DEM, all points that meet the
single category will be retained, and all others removed.
- Mask cat out: in the DEM, all points that meet the
single category will be removed.
- OK: exit the form, and save the category to be redrawn when the map
redraws.
- Cancel: exit the form, and discard the category.
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