Dissolving areas to detect voids in rasters

markm0311
markm0311
in User Scripts
We currently use a combination of GM and ArcMap to detect voids (pixel size and greater) in raster files. I am attempting to use GM scripting to eliminate the need to use ArcMap and conduct all of our process in GM. I have a script written here that will:

1. Load in a directory of raster (.tif) files
2. Generate equal area values for all (.tif) files loaded (with specified parameters)
3. Export those equal areas as a shapefile
4. Unload all rasters and equal area features.
5. Load in the equal areas shapefile that was generated above
6. ...

In step 6 I would like to be able to "dissolve" the loaded shapefile (like in ArcMap) into one area leaving behind my "void" areas, but I am having trouble understanding how I might go about this (*see last line of script provided).

DIR_LOOP_START DIRECTORY="Z:\Edit\miscellaneous\test\Global_Mapper_Scripting\be_rasters" FILENAME_MASKS="*.tif"

IMPORT FILENAME="%FNAME_W_DIR%"

GENERATE_EQUAL_VAL_AREAS FILENAME="%FNAME_W_DIR%" LAYER_DESC="Voids" ATTR_NAME="ELEVATION" ELEV_DIST=4000

UNLOAD_LAYER FILENAME="%FNAME_W_DIR%"

DIR_LOOP_END

EXPORT_VECTOR FILENAME="Z:\Edit\miscellaneous\test\Global_Mapper_Scripting\test_output\voids.shp" TYPE="SHAPEFILE" GEN_PRJ_FILE=YES

UNLOAD_LAYER FILENAME="Voids"

IMPORT FILENAME="Z:\Edit\miscellaneous\test\Global_Mapper_Scripting\test_output\voids.shp"

COMBINE_LINES FILENAME="voids.shp" MAX_DIST=0.1

Thank you for any help!

Mark
Tagged:

Categories