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CoastColour on-demand processing Help pages


L2W Processing
The L2W product provides information about water properties such as IOPs, concentrations and other variables. It also contains an ortho-corrected geo-coding and different flags characterizing pixels.

Processor input: The processor takes L1 and L2R data as input:

  1. this can be MERIS L1b in N1 format or
  2. CoastColour L1P from L1P processing,
  3. CoastColour L2R from L2R processing.

<Input from processings comes here>

Processor output: CoastColour L2W products in the selected format (NetCDF, GeoTIFF, or BEAM-DIMAP).

There is an important switch in the processor parameters: the type of the output reflectances. You can select if water leaving reflectances shall be written as radiances Rw or irradiances RLw. The irradiances ( = radiances multiplied by PI) are compatible with the standard MERIS product.
Pictured below are the three different input types and reflectances:


Selection of the L2W processor

In order to use the L2W processor for production, it must be selected from the Level-2 processors list. Make sure that the checkbox   is checked:

Parameters of the L2W processor

Below the processor selection area, there is a desription block which describes the processor and its parameters.
Unfold the text block for the contents to be displayed:

Please note that the processing steps of the L1P processor are implicitly included if the processing starts from a MERIS L1b product.
That's why they appear here as well. If you need to change the default values of the processor, you have two possibilities.
In the "Level-2 Parameters" section:

  1. Upload a file containing the parameters in an XML structure.
    Pictured below, we have uploaded a file "L2W_params.xml". Or
  2. Click on "Edit Parameters". This brings up the parameter editor.

Either way, after uploading or editing of the parameters, they are displayed in the text box in an XML structure:

Choose file Edit parameters


You can copy the contents of the text box as a parameter file template for the upload.