SNAP Data Processors - Idepix Processor - Command Line Description

Command Line Description

Since the Idepix 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 Idepix processor can be obtained for the supported instruments with

${S3TBX-INSTALL-DIR}/bin/gpt -h Idepix.Landsat8
${S3TBX-INSTALL-DIR}/bin/gpt -h Idepix.Modis

In this case, information on the usage and a list of all available parameters are given. E.g., for MODIS this looks like in the figure below.

The Idepix processor parameters can also be specified via a graph xml file. E.g., a possible graph xml file for MODIS 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="IdepixModisTest">
        <version>1.0</version>
        <node id="idepix">
            <operator>Idepix.Modis</operator>
            <sources>
                <source>${modisProduct}</source>
            </sources>
            <parameters>
                <cloudFlaggingStrength>CLOUD_CONSERVATIVE</cloudFlaggingStrength>
            </parameters>
            <parameters>
                <cloudBufferWidth>2</cloudBufferWidth>
            </parameters>
            <parameters>
                <waterMaskResolution>300</waterMaskResolution>
            </parameters>
            <parameters>
                <outputRad2Refl>false</outputRad2Refl>
            </parameters>
            <parameters>
                <outputEmissive>true</outputEmissive>
            </parameters>
        </node>
    </graph>

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

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