Table of Contents
Raster Algebra
The Raster Algebra Utility allows you to calculate new rasters by combining a number of source bands. These bands are combined using a user-specified formula.
ORA Files
Expressions can be saved as ORA (Orbit Raster Algebra) files.
These files contain the following information :
- The location of the datasets involed in the formula
- The location of the last output file
- The formula itself
When you open an ORA file, the datasets involved will be automatically opened in Orbit GIS.
Set-up a Project
To setup a project, you must first open some image datasets in Orbit GIS. Those (and only those) datasets will be made selectable in the image calculator.