Isis 2 Documentation
impcal - Radiometric correction of Pathfinder IMP camera images INTRODUCTION ------------ "impcal" performs radiometric corrections to images acquired by the Pathfinder IMP camera. "impcal" performs dark subtraction, readout correction and flat field corrections. "impcal" gives the user the option of writing the output image values as counts/ms or as intensity units. See the user parmeter, ABSOL. The default is units of intensity (W/m^2/um/ster). Programmer: Tracie Sucharski, U.S.G.S., Flagstaff, AZ
Parm | Description | Default |
---|---|---|
FROM | Input file name | NONE |
TO | Output file name | NONE |
RESPONSE | Responsivity value | -- |
OTYPE | Output pixel type | 3 |
ORANGE | Output pixel data range | -- |
USERNOTE | User comment |
ADDITIONAL NOTES:
Parm | Description |
---|---|
FROM | Specify the input file to be corrected. |
TO | Specify the output file. The result will be the radiometrically corrected image. The output values can either be output as counts/ms or absolute radiance. The ouput file can be 8, 16, or 32 bit which is defined by the OTYPE parameter shown below. |
RESPONSE | This is used to convert the data into units of intensity (W/m^2/um/ster). This values should be in units of (DN/s)/(W/m^2/um/sr). If you wish to leave the results in counts/ms, enter a value of 1.0 in this parameter. |
OTYPE | Output pixel data type. Permitted values are: 0 - output type is same as input file pixel type 1 - 8-bit (integer with type conversion parameters) 2 - 16-bit (integer with type conversion parameters) 3 - 32-bit (floating point) |
ORANGE | Output pixel data range. If the output pixel type is 1 (8-bit integer with type conversion parameters) or 2 (16-bit integer with type conversion parameters), then the type conversion parameters in the output file will be set to values that allow representing the specified range of output values. Output values outside this range will be stored as the special "representation saturation" value. The ORANGE parameter is ignored if the output pixel type is 3 (32-bit floating point) since type conversion parameters are not applicable to floating point pixel values. If both ORANGE(1) and ORANGE(2) are 0.0, then the type conversion parameters in the output file will automatically be set to allow representing the same range of values as can be represented in the input file. (The user will be required to supply a specific range for ORANGE if the input pixel type is 3 (32-bit floating point) and the output pixel type is 1 (8-bit with type conversion parameters) or 2 (16-bit with type conversion parameters)). |
USERNOTE | Comment from the user. This will be recorded in the ISIS session log file and also in the History entry that is put into the History object of the output file. |
Contact us online at the Isis Support Center: http://isisdist.wr.usgs.gov