This is invoked from the "Calculate" menu of a map window with a
- Slope: calculates average
slope between two selected points picked on the map. It figures
this average slope by the total change in
elevation between the two points and the distance
between them. It does not account for intervening
rises and drops; thus you should select two end
points of a relatively uniform slope. You select the two
points graphically on the map.
- Excessive slopes: finds and
labels all slopes greater than a specified value
with a large point symbol. This is useful
for finding errors and blunders in a DEM, and
will show every such point. A terrain
category might miss some points if the DEM must
be subsampled to display, and individual points
may be hard to locate.
slope (algorithms): calculates the slope
at a point with all the supported
slope algorithms. Since the slope algorithm does not
generally make much difference, you should be sure you want to
perform this analysis.
- Steepest slope: finds the steepest
slope on the map. This is likely to be the
result of one or more bad elevation values in the
DEM, and provides a good assessment of DEM
- Directional: shows the elevations of the point and its eight
neighbors, and the slope in each of the eight directions.
Last revision 1/16/2013