Some options (relief, openness) require that
a region size be selected. The size is in meters, and converted into the
number of grid points needed. The computations will use a
square centered on the point.
Some options (e.g. slope, reflectance, aspect) can be
selected from the display option of the DEM display, but
have limited modification capability since they are just
display modes of the DEM.
 Multiple parametersThis allows creation of
multiple grids while you do something else. Parameters within
each grouping are computed together, and doing more than adds little
time, but will increase memory usage.
 Slopeuses current
slope algorithm
 All slope/aspect
 Slope (%) (100 * tan)
 Slope (%) and components (x and y)
 Degrees
 m/m
 Sin
 log10 tangent
 ln tangent
 sqrt sin
 slope and roughness
 Roughness (std of slope)
 Roughness (from SSO)
 Slope error estimator
 Aspectuses current
slope algorithm
 Aspect 360
 NS component: sin(aspect), 1 is east, 1 is west
 EW component: cos(aspect), 1 is north, 1 is south
 Curvature: They will be
drawn with a percentile color stretch. The five at once will be
threaded and probably execute faster than a single layer.
 All 5 curvatures, Evans algorithm
 Profile/slope convexity
 Plan convexity
 Cross sectional curvature
 Minimum curvature
 Maximum curvature
 5 algorithms, 2 curvatures
 Relief
 Relief, average elevation, elevation standard deviation, REL
(percentage of area that is lower), and TPI: all for a specified region
size
 Relief, Summit levels, Base Level,
Geophysical Relief
 Immediate neighborhood drop: drop off is the distance from the point to the
lowest point in the box with the selected size.
 Rugosity
 Convergence index
 Topographic ruggedness index
and topographic position index (TPI amd TRI)
 Openness
 Reflectance
 Terrain category: pick a terrain category,
and the points meeting the criteria will have a single value in the
resulting grid.
 Transform elevations
 Terrain classificationuses current classification algorithm
 Ridgesall peaks and ridges will have the
elevation; other points will be missing
 Valleysall streams will have the elevation;
other points will be missing
 All terrain categorieswill have an integer
code for the category
 Iwashashi and Pike Classification
 Terrain organization maps: Organization (s2/s3), Flatness (s1s2,
inverse slope), Fabric
direction, Roughness
factor (slope)
 Moments for region (elevation, slope, two curvatures, the
moments for a selected region size)
 Point density: divides value at each grid point by size
of the grid; the result will in count/m².
 Optimal viewshed location
