4.3. Processing Parameters

From the Processing Parameters tab pane, the parameters to apply and tune the cloud and snow masks can be specified.

4.3.1. Processing Parameters Tab Pane

Snow Radiance processor: Processing Parameters Tab Pane

Figure 4.6. Snow Radiance processor: Processing Parameters Tab Pane


This tab pane consists of the following components:
  • Checkbox 'Apply cloud mask': If this checkbox is selected, a cloud mask (as specified below) will be applied, which means that pixels classified as cloudy will not be considered for snow properties retrieval.
  • Radio button 'Cloud probability (MERIS O2 Project)': If this radio button is selected, the cloud mask will be computed with the algorithms developed within the MERIS O2 Project, which are based on a cloud probability approach (see [4]). This radio button is enabled only if the 'Apply cloud mask' checkbox is selected.
  • Radio button 'Feature classification (MERIS/AATSR Synergy Project)': If this radio button is selected, the cloud mask will be computed with the algorithms developed within the MERIS/AATSR Synergy Project, which are based on a feature classification approach (see [5]). This radio button is enabled only if the 'Apply cloud mask' checkbox is selected.
  • Text field 'Cloud probability threshold': In this text field, a cloud probability threshold can be set if the cloud mask shall be computed with the cloud probability approach. Range is [0,1], default value is 0.4. This text field is enabled only if the 'Apply cloud mask' checkbox and the Radio button 'Cloud probability (MERIS O2 Project) are selected.
  • Text fields 'Thresholds for snow/ice flags': In these text fields, NDSI lower and upper thresholds for the snow and ice flag computation can be set. Lower default value is 0.75, upper default value is 0.9.
  • Checkbox 'Mask 100% snow': If this checkbox is selected, a '100% snow' mask will be applied as specified in ATBDs ([2], [3]).
  • Text fields '100% snow thresholds' for AATSR 1610nm: In these text fields, lower and upper thresholds for AATSR reflectance at 1610nm for the usage in the '100% snow' mask algorithm can be set. Lower default value is 1.0, upper default value is 10.0. These text fields are enabled only if the 'Mask 100% snow' checkbox is selected.
  • Text fields '100% snow thresholds' for AATSR 670nm: In these text fields, lower and upper thresholds for AATSR reflectance at 670nm for the usage in the '100% snow' mask algorithm can be set. Lower default value is 60.0, upper default value is 100.0. These text fields are enabled only if the 'Mask 100% snow' checkbox is selected.
  • Text field 'Assumed emissivity at 11 microns': In this text field, a value for the assumed emissivity at 11 microns can be set. Range is [0,1], default value is 0.99. This text field is enabled only if the 'Apply cloud mask' checkbox and the Radio button 'Cloud probability (MERIS O2 Project) are selected.