SNAP Data Processors - Radiance-to-Reflectance Processor

Command Line Description

Since the Radiance-to-Reflectance processor makes use of the SNAP graph processing framework, it can be used also as a command line tool. The graph processing is invoked by the command

${S3TBX-INSTALL-DIR}/bin/gpt

To obtain general help on the graph processing, use the command

${S3TBX-INSTALL-DIR}/bin/gpt -h

Specific help on the Radiance-to-Reflectance processor can be obtained with

${S3TBX-INSTALL-DIR}/bin/gpt -h Rad2Refl

In this case, information on the usage and a list of all available parameters are given.

The Radiance-to-Reflectance processor parameters can also be specified via a graph xml file. A possible graph xml file could look like the following. (Note that in principle it is not necessary to explicitly set parameters if default values shall be used).


    <graph id="RadianceToReflectanceOlciTest">
        <version>1.0</version>
        <node id="rad2refl">
            <operator>Rad2Refl</operator>
            <sources>
                <source>${olciProduct}</source>
            </sources>
            <parameters>
                <sensor>OLCI</sensor>
            </parameters>
            <parameters>
                <conversionMode>RAD_TO_REFL</conversionMode>
            </parameters>
            <parameters>
                <copyFlagBandsAndMasks>true</copyFlagBandsAndMasks>
            </parameters>
            <parameters>
                <copyNonSpectralBands>true</copyNonSpectralBands>
            </parameters>
            <parameters>
                <copyTiePointGrids>true</copyTiePointGrids>
            </parameters>
        </node>
    </graph>

This graph can be invoked by the following call on the command line:

  gpt <graph-file.xml> -SolciProduct=<path-to-source-file>