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• GRID_FLATTEN_AREAS - specifies that area features with elevation values should be flattened to
the elevation of the area features. Use GRID_FLATTEN_AREAS=NO to disable this.
• GRID_HEIGHTS_RELATIVE - specifies that the elevation values for the input vector features
should be treated as relative to any loaded terrain data rather than as absolute elevation values. This
useful for things like trees or buildings where you have a height above the ground rather than an
absolute height. Use GRID_HEIGHTS_RELATIVE=YES to enable this.
• GRID_SAVE_TIN - specifies that the triangulated irregular network (TIN) for the grid operation
should be saved as a new separate vector layer consisting of triangular 3D area features. Use
GRID_SAVE_TIN=YES to enable this.
• GRID_USE_CONSTRAINTS - specifies that 3D line and area features should be treated as
constraints (breaklines) during the gridding process. Use GRID_USE_CONSTRAINTS to enable this.
• GRID_IGNORE_ZERO - specifies that features with an elevation of 0.0 will not be used during the
gridding process.
GENERATE_EQUAL_VAL_AREAS
Global Mapper User's Manual
The GENERATE_EQUAL_VAL_AREAS command allows for the generation of areas for regions of the
same (or similar) color or elevation values fro a loaded raster or elevation layer.
• FILENAME - specifies the filename of the already loaded layer from which to generate the
equal-value areas.
• LAYER_DESC - specifies the description to use for the layer
• ATTR_NAME - specifies the name to use for the attribute holding the color or elevation that a
particular area represents. If you leave this attribute off then no value attribute will be saved with each
area.
• AREA_TYPE - specifies the name of the area type to assign to the area features. See the Area Styles
tab of the Configuration dialog for a list of available type names.
• COLOR_DIST - specifies how far from an exact match each color channel of a color value must be to
be considered the same. By default a value of 0 is used which means exact matches only. If you want
to break the entire color range into say 4 ranges for each color channel, use something like
COLOR_DIST=32 as that would allow colors up to 32 away from each color channel value to match
to a color.
• ELEV_DIST - specifies how far from an exact match (in meters) each value must be to be considered
the same. By default a value of 0 is used which means exact matches only. If you want to say split
into area groups 10 meters in size, use ELEV_DIST=5. This would give you areas with values
between -5 and 5 meters, 5 and 15 meters, etc.
• GLOBAL_BOUNDS - specifies the bounds in units of the current global projection. There should be
4 values in a comma-delimited list following the parameter name. The values should be in order of
minimum x, minimum y, maximum x, maximum y.
• GLOBAL_BOUNDS_SIZE - specifies the bounds in units of the current global projection. There
should be 4 values in a comma-delimited list following the parameter name. The values should be in
order of minimum x, minimum y, width in x, width in y.
• LAT_LON_BOUNDS - specifies the bounds in latitude/longitude degrees. There should be 4 values
in a comma-delimited list following the parameter name. The values should be in order of westmost
longitude, southernmost latitude, easternmost longitude, northernmost latitude.
• LAYER_BOUNDS - specifies that the area generation should use the bounds of the loaded layer(s)
with the given filename. For example, to generate contours to the bounds of the file "c:\test.tif", you
would use LAYER_BOUNDS="c:\test.tif". Keep in mind that the file must be currently loaded.
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