Radiannet Input File Format

Radiannet input files must be in one of two ascii formats. All fields seperated by spaces. Lat/Long values are in decimal degress, and brightness temperatures are in degrees celsius.
  1. Band 4 Brightness Temperature, Band 5 Brightness Temperature
    For example:
    -29.39 -19.27
    -11.63 -8.71
    etc...
    With a file such as this, it is not possible to produce maps of the results.
  2. Latitude, Longitude, Band 4 Brightness Temperature, Band 5 Brightness Temperature
    For example:
    55.1169 162.862 -29.39 -19.27
    55.1176 162.940 -11.63 -8.70
    etc...
    In this case, the lat/long values are "carried along" during the calculations, and the output file includes lat/long as well as the retrieved values. This makes it possible to produce maps of the results.
Note: Due to FORTRAN limitations, the input filename must start with a letter, and not a number. The only other information you need to know to input the data is is the array size, or number of points in the file. Note that the array size is the number of lines in the input file, not the number of values in the file. A 100x100 array would have 10,000 points, whether or not the lat/long values are included in the file. Irregular shaped arrays are supported.

How to Create a Radiannet Input File Using Terascan

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"

How to Create a Radiannet Input File Without Using Terascan

A Radiannet input file can be created using an editor or image processing tools. A