Importing calibration coefficients from a file

If the input file does not contain the appropriate metadata, you must either manually enter the required information, or import the data from a text file.

Note: If you skip this step, and this information is not available through metadata, the calibration offset and gain are assumed to be 0 and 1 respectively. These values are acceptable for haze removal, but will produce incorrect results for the TOA, cloud masking, ground reflectance, and surface temperature calculations.

To import calibration information from a text file:

From the Radiometric Information section’s Calibration coefficients source drop-down list, select Import from Text File.
Click the down arrow beside the Text file (multispectral) field to display the calibration files available in the open Focus data set. Alternatively, click Browse to select a file.
The atcor\cal\ folder in the CATALYST Professional installation directory contains sample calibration files for each supported sensor.

If you provide a different calibration file, ensure that it has the same format and units as the sample files provided for the specified sensor. For more information, see Editing an existing calibration file to create a new file.
The application reads the calibration coefficients from the specified text file and populates the offset and gain in the Band Setup window.
If you specified a panchromatic input image file, click the down arrow beside the Text file (panchromatic) field to specify a calibration coefficients text file.
Click Band Setup. The Band Setup window is automatically populated with the information from the input text file.
Verify the Offset, Gain, Channel, and Background Value for each band, making any necessary changes.
Click OK to close the Band Setup window and return to the atmospheric correction workflow.