MERIS Level 1 Radiometric Processor - Command Line Description

Processor Description

Since the MERIS Radiometric Correction 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 To obtain general help on the graph processing, use the command Specific help on the MERIS Radiometry Correction processor, can be obtained with In this case, information on the usage and a list of all available parameters are given.

If MERIS N1 products shall be written as output result a graph xml file has to be created. This xml file should concatenate the Meris.CorrectRadiometry operator and the Meris.N1Patcher operator. A possible graph xml file would look like the following. For demonstration purpose only the necessary parameter have been set.

    <graph id="RadiometryCorrectionN1">
        <version>1.0</version>
        <node id="radiometry">
            <operator>Meris.CorrectRadiometry</operator>
            <sources>
                <source>${n1Product}</source>
            </sources>

        </node>
        <node id="n1Writer">
            <operator>Meris.N1Patcher</operator>
            <sources>
                <n1>${n1Product}</n1>
                <input>radiometry</input>
            </sources>
            <parameters>
                <patchedFile>${n1TargetFile}</patchedFile>
            </parameters>
        </node>
    </graph>

This graph can be invoked by the following call on the command line:
  gpt <graph-file.xml> -Pn1TargetFile=<path-to-target-file> -Sn1Product=<path-to-source-file>