Open Printable/Searchable Copy - Global Mapper

• COMPARE_STR - specifies a comparison operation to perform to see if a line feature is one that
needs to be considered. The format is attr_name=attr_value or attr_name!=attr_value (for equals and
not equals comparisons respectively). For example if you have an attribute named CFCC and you
want to match when the value of that attribute starts with an 'A', you can use
COMPARE_STR="CFCC=A*" as your parameter. You can add multiple COMPARE_STR
parameters to a single command to combine multiple criteria for your search. If you would like to
compare against a feature label rather than an attribute, use for your attribute name.
To compare against a feature type name rather than an attribute, use for your attribute
name. To compare against the feature description, use for your attribute name. If you
just want all lines features from the specified layer(s), just don't specify a COMPARE_STR value.
You can also use to specify a match against a layer name that will support
wildcards.
• CASE_SENSITIVE - specifies whether or not text comparisons are case sensitive or not. Use
CASE_SENSITIVE=YES to enable, by default comparisons are not case sensitive.
• LAYER_DESC - specifies the name to assign to the newly generated layer containing the connected
line features. If no layer description is provided, the default name of "Combined Lines" will be used.
• COMPATIBLE_ONLY - specifies whether or not any connecting lines should be combined (the
default) or just those which have compatible types and attributes. Use COMPATIBLE_ONLY=YES
to enable combining only compatible lines.
• CLOSED_LINES_ONLY - specifies whether or not any connected lines have to form a closed shape
in order to create an area when generating area features. Use CLOSED_LINES_ONLY=YES to
enable requiring closed paths.
• CREATE_MULTIPLE_AREAS - specifies whether multiple area features can be created if the lines
don't all connect to each other. This is enabled by default, use CREATE_MULTIPLE_AREAS=NO
to disable this and require all matching lines to connect in a single path before creating an area.
COMBINE_TERRAIN
Global Mapper User's Manual
The COMBINE_TERRAIN command generates a new terrain (gridded elevation) layer by combining two
loaded terrain layers through some operation, like addition, subtraction (difference), average, min/max, etc.
The new terrain layer can then be operated on just like any other terrain layer.
The following parameters are used by the COMBINE_TERRAIN command:
• LAYER1_FILENAME - full path and filename of the first loaded terrain layer to use. You can also
pass in the full description of the loaded layer to use in case you want to use a layer not loaded from a
file.
• LAYER2_FILENAME - full path and filename of the second loaded terrain layer to use. You can also
pass in the full description of the loaded layer to use in case you want to use a layer not loaded from a
file.
• COMBINE_OP - defines the operation to perform when combining the layers. The following
operations are supported:
♦ ADD - adds the values from the first layer to the second
♦ SUBTRACT_SIGNED - subtracts the values of the second layer from the first and saves the
signed result.
♦ SUBTRACT_UNSIGNED - subtracts the values of the second layer from the first and saves
the magnitude of the result.
♦ AVERAGE - saves the average of the values from the first and second layers.
♦ MINIMUM - saves the smaller of the values from the first and second layers.
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