3.4.3.5. Sentinel-1¶

Sentinel-1

This tab allows for the conversion of Sentine-1 images, in particular Sentinel-1 Satellites images (GRD) VV and VH polarizations. For the processing method please read Sentinel-1 preprocessing.

The path to the SNAP gpt executable must be entered in settings Processing.

3.4.3.5.1. Sentinel-1 conversion¶

• Sentinel-1 file : open a Sentinel-1 file (.zip);
• Select SNAP xml graph (optional) : select a custom graph file (.xml) to be used for preprocessing; predefined variables for the xml graph can be: $input for the input file, $polarization for VV or VH polarization if only one polarization is checked, $output for the output file ($outputVV and \$outputVH if both polarizations are checked);
• Polarization VV VH: if checked, process VV and VH polarizations;
• Raster projection as Band set : if checked, project the raster to the same coordinate reference system as a band set (default WGS 84);
• convert to dB: if checked, convert values to dB;
• Use value as NoData : if checked, pixels having NoData value are not counted during conversion;
• Create Band set and use Band set tools: if checked, bands are added to the active Band set after the conversion; also, the Band set is processed according to the tools checked in the Band set;
• Add bands in a new Band set: if checked, bands are added to a new empty Band set after the conversion;

All the bands found in the Directory containing Landsat bands are listed in the table Metadata. If the Landsat metadata file (a .txt or .met file with the suffix MTL) is provided, then Metadata are automatically filled. For information about Metadata fields read this page and this one .

• Satellite : satellite name (e.g. Landsat8);
• Date : date of acquisition (e.g. 2013-04-15);
• Sun elevation : Sun elevation in degrees;
• Earth sun distance : Earth Sun distance in astronomical units (automatically calculated if Date is filled;
• : remove highlighted bands from the table Metadata;
• Metadata: table containing the following fields;
• Band: band name;
• RUN : select an output directory and start the conversion process; only bands listed in the table Metadata are converted; converted bands are saved in the output directory with the prefix RT_ and automatically loaded in QGIS;