Exporting the image file
Go to the Overlay Control Center and select your image file/files for export.
Make the following selections in Global Mapper:
"Export Elevation Raste/Image Format ...."
"GeoTIFF" file format
"Tip Window" click OK
This brings you to the "GeoTIFF Export Option" window.
In the "GeoTIFF Options" window
Check "8-bit Palette Image"
Select Palette as Grayscale - Min is Black
Check "Export at fixed Scale 1:" _______ <--- enter your scale (this is the same scale as the SHAPE file)
In "TIFF Format Options" enter a DPI value of 500 <---- the laser marks at 500 DPI
Check "Interpolate to fill small gaps in data"
At the top of the "GeoTIFF Export Option" window select "Export Bounds". This brings up the "Export Bounds" window.
In the "Export Bounds" window
Hit the "Draw Box" button, draw the bounding box.
Check "Scaled Corner w/Size"
Enter the Width _____ and Height _____ <---- in inches, use only whole numbers
(use the same size as for the SHAPE file)
Your model image overlay is ready for export. Click OK. The Save as window displays.
Name the TIFF file and append the word IMAGE to the name to identify it as an IMAGE grid file.
Click OK to save the file.