The first step is to register the image using a Master file that has an equal area projection such as the lambert_azim projection. The image needs to be subsetted so that it mostly contains volcanic cloud pixels. Using "xvu" (the terascan point-and-click interface), use the menu "Select" and select "Point Locations". Create a pointfile by outlinng the Volcanic pixels with "Outlines" or "Boxes". Make sure the Coordiantes type is "Lat/Lon". The easiest way to determine what are volcanic cloud pixels is by displaying Band 4 or by displaying Band 4 - Band 5. The pointfile can be displayed on an image by using xvu, use the menu "Overlay" and select "Points" and entering the pointfile name.
The next step is to create a subset outputfile. Using xvu, use the menu "Select" and select "Point List". For the file list, enter the registered image filename. Selected Band 4 and Band 5 variables. The pointfile is the filename of pointfile created in the previous step. Make sure that Save Corrds is "Yes".
The final step is to output the file in ASCII format. Using xvu, use the menu "Utils" and select "Export ASCII". The File list is the filename from the previous step. Selected all variables. Sort By "All Dims". Set List Dims to "NO"
A Radiannet input file can be created using an editor or image processing tools. A