Selection in Images

How to select data in images

The following pages describe how to select data stored in images. The most useful methods include: 

  • Selecting data by n-dimensional pixel parameters, including spatial coordinates (e.g. RA/DEC), spectral (image planes, frequencies, velocities), and Stokes. 
  • Image Region files 
  • Image Masks
  • Mathematical Expressions (Lattice Expression Language, LEL)