The Cropping tab (pictured below) allows you to crop the selected overlay(s) to a particular boundary, including support for automatically removing the collars from USGS DRG topographic maps.
This option is used to automatically remove the collar from loaded raster data if the collar is in a recognized format. Most frequently it is used to removes the white border around a DRG, the small black collar around a 3.75 minute DOQQ, or the map collar around a BSB marine chart. This allows seamlessly viewing a collection of adjacent BSB, DRG, or DOQQ files.
This option allows specifying
a lat/lon boundary (in the native datum of the selected overlay) to crop
the overlay to. When selected, this option will display the Customize
Collar Bounds dialog (pictured below) to allow specifying the bounds
to crop to.
The option allows specifying a crop boundary in the native units of the selected overlay. When selected, this option will display the Customize Collar Bounds dialog (pictured above) to allow specifying the bounds to crop to.
This option allows specifying a number of pixels to crop of each edge of the selected overlay(s).
This option allows specifying that the collar for the selected overlay will be on some degree boundary, like an even degree, of 0.5 degrees, etc. Allowing the user to setup cropping for a collection of maps that are all similarly aligned.
The option allows cropping to the defined crop polygon(s) (area) previously applied to the selected layer(s) by using the Crop to Currently Selected Polygon option.
This option allows specifying the area to crop by cropping the selected layer(s) to any area feature(s) currently selected with either the Feature Info or Digitizer Tools.
This option allows cropping out the currently selected polygons from the raster layer. This will create holes in the raster layer where the polygons are.