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GENERATE_ELEV_GRID
Global Mapper User's Manual
The GENERATE_ELEV_GRID command allows for the generation of a gridded elevation layer using loaded
3D vector data. The following parameters are supported by the command as well as the display option
paramters supported by the IMPORT command.
• ELEV_UNITS - specify elevation units to use for new grid
♦ FEET - US feet
♦ DECIFEET - 10ths of US feet
♦ METERS - meters
♦ DECIMETERS - 10ths of meters
♦ CENTIMETERS - centimeters
• SPATIAL_RES - specifies spacing of grid points to use in generated grid. A smaller grid spacing
results in higher fidelity, but larger, elevation grids. Should be formatted as x_resolution,y_resolution.
The units are the units of the current global projection. For example, if UTM was the current global
projection and you wanted to use a grid with a 30 meter spacing, the parameter/value pair would look
like SPATIAL_RES=30.0,30.0. If you do not provide a SPATIAL_RES value, a good default for the
input data will be chosen, so in most cases it is best just to leave this off.
• SPATIAL_RES_METERS - specifies spatial resolution to use in meters. The value in meters will
automatically be converted to the curent view/export projection units. For example, to do an export at
2.0 meter spacing (or as close as you can get to that in the current units), use
SPATIAL_RES_METERS=2.0, or to do an export at 1.0 meters in X by 1.5 meters in Y, use
SPATIAL_RES_METERS="1.0,1.5".
• GLOBAL_BOUNDS - specifies the grid 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 grid 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 grid 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 grid 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.
• LAYER_DESC - specifies the name to assign to this layer. If no layer description is provided, a
default name will be assigned.
• NO_DATA_DIST_MULT - specifies how far from an actual data point a grid cell has to be before it
is treated as a no data value. This number is given as a multiple of the diagonal size of a single grid
cell as nominally determined by the gridding algorithm or specified with the SPATIAL_RES
parameter. A value of 0 (the default) means that all points should be considered as valid.
• GRID_FILL_TO_BOUNDS - specifies that the grid values should be filled out to the entire bounds of
the gridded data rather than just to the convex hull of the data being gridded. Use
GRID_FILL_TO_BOUNDS=YES to enable this.
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