Open Printable/Searchable Copy - Global Mapper

GENERATE_EQUAL_VAL_AREAS
The GENERATE_EQUAL_VAL_AREAS command allows for the generation of areas for regions of the
same (or similar) color, elevation, or slope values from a loaded raster or elevation layer.
SAMPLE:
Global Mapper User's Manual
• 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, elevation, or slope 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.
• SLOPE_DIST - specifies how far from an exact match (in degrees) 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 degrees in size, use SLOPE_DIST=5. This would give you areas with
values between 0 and 10 degrees, 10 and 20 degrees, etc.
• FORCE_RGB - specifies that the attribute value for a color-based area will always be the full RGB
color and not a palette index/name if available. Use FORCE_RGB=YES to enable.
• 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.
• LAYER_BOUNDS_EXPAND - specifies that the operation should expand the used
LAYER_BOUNDS bounding box by some amount. The amount to expand the bounding rectangle by
should be specified in the current global projection. For example, if you have a UTM/meters
projection active and want to expand the bounds retrieved from the LAYER_BOUNDS parameter by
100 meters on the left and right, and 50 meters on the top and bottom, you could use
LAYER_BOUNDS_EXPAND="100.0,50.0". You can also specify a single value to apply to all 4
sides, or supply 4 separate values in the order left,top,right,bottom.
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