| Environments | PYTHON :: EASI :: MODELER |
| Batch Mode | Yes |
| Quick links | Description :: Parameters :: Parameter descriptions :: Details :: Related |
| Back to top |
| Back to top |
| Name | Type | Length | Value range |
|---|---|---|---|
| Output: Output radiance LUT file name * | BIN port | 1 - | |
| Tape7 MONDTRA4 File * | String | 1 - | |
| Vertical Water Vapor Column Interval | Float | 0 - 3 | |
| Vertical Water Vapor Column Samples | Float | 0 - 3 | |
| Aerosol Optical Depth Range Interval | Float | 0 - 3 | |
| Aerosol Optical Depth Range Samples | Float | 0 - 3 | |
| Surface Meteorological Range Interval | Float | 0 - 3 | |
| Surface Meteorological Range Samples | Float | 0 - 3 | |
| Reflectance Interval * | Float | 3 - 3 | |
| Reflectance Samples * | Float | 3 - 3 | |
| Relative View-Solar Azimuth Interval * | Float | 3 - 3 | |
| Relative View-Solar Azimuth Samples * | Float | 3 - 3 | |
| View Zenith Angle Interval * | Float | 3 - 3 | |
| View Zenith Angle Samples * | Float | 3 - 3 | |
| Solar Zenith Angle Interval * | Float | 3 - 3 | |
| Solar Zenith Angle Samples * | Float | 3 - 3 | |
| Scene Elevation Interval * | Float | 3 - 3 | |
| Scene Elevation Samples * | Float | 3 - 3 | |
| Sensor Altitude Interval * | Float | 3 - 3 | |
| Sensor Altitude Samples * | Float | 3 - 3 |
| Back to top |
Output: Output radiance LUT file name
Specifies the output segment to receive the output radiance LUT.
If no leading path is specified, the file is assumed to be located in the current working directory.
Tape7 MONDTRA4 File
Specifies the name of the "tape7" MODTRAN4 file that contains the results from the MODTRAN4 execution.
Vertical Water Vapor Column Interval
Specifies the vertical water vapor column interval endpoints (in g.cm^2).
This setting must match the Vertical Water Vapor Column Interval setting that was used for the related GENTP5 run.
Vertical Water Vapor Column Samples
Specifies the number of vertical water vapor column samples.
This setting must match the Vertical Water Vapor Column Samples setting that was used for the related GENTP5 run. In particular, if no value was specified for GENTP5, one must not be specified here.
Aerosol Optical Depth Range Interval
Specifies the aerosol optical depth range interval endpoints (at 550 nm).
This setting must match the Aerosol Optical Depth Range Interval setting that was used for the related GENTP5 run. In particular, if no value was specified for GENTP5, one must not be specified here.
Aerosol Optical Depth Range Samples
Specifies the number of aerosol optical depth range samples.
This setting must match the Aerosol Optical Depth Range Samples setting that was used for the related GENTP5 run. In particular, if no value was specified for GENTP5, one must not be specified here.
Surface Meteorological Range Interval
Specifies the surface meteorological range interval endpoints (in km).
This setting must match the Surface Meteorological Range Interval setting that was used for the related GENTP5 run. In particular, if no value was specified for GENTP5, one must not be specified here.
Surface Meteorological Range Samples
Specifies the number of surface meteorological range samples.
This setting must match the Surface Meteorological Range Samples setting that was used for the related GENTP5 run. In particular, if no value was specified for GENTP5, one must not be specified here.
Reflectance Interval
Specifies the reflectance interval endpoints (in percentage).
This setting must match the Reflectance Interval setting that was used for the related GENTP5 run.
Reflectance Samples
Specifies the number of reflectance samples.
This setting must match the Reflectance Samples setting that was used for the related GENTP5 run.
Relative View-Solar Azimuth Interval
Specifies the relative view-solar azimuth (solar azimuth minus view azimuth) interval endpoints (in degrees).
This setting must match the Relative View-Solar Azimuth Interval setting that was used for the related GENTP5 run.
Relative View-Solar Azimuth Samples
Specifies the number of relative view-solar azimuth samples.
This setting must match the Relative View-Solar Azimuth Samples setting that was used for the related GENTP5 run.
View Zenith Angle Interval
Specifies the view zenith angle interval endpoints (in degrees).
This setting must match the View Zenith Angle Interval setting that was used for the related GENTP5 run.
View Zenith Angle Samples
Specifies the number of view zenith angle interval samples.
This setting must match the View Zenith Angle Samples setting that was used for the related GENTP5 run.
Solar Zenith Angle Interval
Specifies the solar zenith angle interval endpoints (in degrees).
This setting must match the Solar Zenith Angle Interval setting that was used for the related GENTP5 run.
Solar Zenith Angle Samples
Specifies the number of solar zenith angle interval samples.
This setting must match the Solar Zenith Angle Samples setting that was used for the related GENTP5 run.
Scene Elevation Interval
Specifies the scene elevation interval endpoints (in meters with respect to the WGS84 vertical datum).
This setting must match the Scene Elevation Interval setting that was used for the related GENTP5 run.
Scene Elevation Samples
Specifies the number of scene elevation samples.
This setting must match the Scene Elevation Samples setting that was used for the related GENTP5 run.
Sensor Altitude Interval
Specifies the sensor altitude interval endpoints (in meters with respect to the WGS84 vertical datum).
This setting must match the Sensor Altitude Interval setting that was used for the related GENTP5 run.
Sensor Altitude Samples
Specifies the number of sensor altitude samples.
This setting must match the Sensor Altitude Interval setting that was used for the related GENTP5 run.
| Back to top |
GENRLUT is designed to be used in combination with GENTP5 and the MODTRAN4 program from Ontar Corporation to produce a radiance lookup table (RLUT) for the atmospheric transformation of remotely sensed images. GENRLUT has been tested with Version 2, Revision 1 of the MODTRAN4 program.
The radiance units used in the generated RLUT are microwatts/cm^2/nm/sr.
The "tape7" file generated by the MODTRAN4 program contains the results of one or more MODTRAN4 runs. GENRLUT transforms this file into an RLUT.
RLUT format
The radiance lookup table (RLUT) is a 9-dimensional array. An RLUT table entry is a pair of real values: Lg, the at-sensor radiance reflected by the target, and Lo, the at-sensor radiance due to all other sources including atmospheric scattering, adjacency effects, and thermally generated radiation.
One or more samples are identified on each dimension. The number of samples along a given dimension and the coordinates of those values correspond to the "interval and number of samples" parameter values used for the matching physical quantity in the GENTP5 and GENRLUT runs.
An RLUT is stored exclusively in a PCIDSK binary segment. One RLUT can be stored per segment. All RLUT attributes are saved as metadata for that binary segment.
Upon saving the RLUT to disk, the RLUT entries are serialized into a system-independent byte stream and written to the binary segment.
Getting MODTRAN4
The MODTRAN4 CDROM and single-user license are available from Ontar Corporation (http://www.ontar.com/Software/pricing.aspx). PCI Geomatics has tested GENTP5 and GENRLUT with Version 2, Revision 1 of the MODTRAN4 software.
© PCI Geomatics Enterprises, Inc.®, 2026. All rights reserved.