Sentinel-1 L1 GRD

Level-1 Ground Range Detected (GRD) products consist of focused SAR data that has been projected to ground range using an Earth ellipsoid model. The projection is corrected using the terrain height specified in the product general annotation. GRD products are generated from the following Sentinel-1 imaging modes:

  • Stripmap (SM)
  • Interferometric Wide Swath (IW)
  • Extra Wide Swath (EW)

Ground range coordinates are the slant range coordinates projected onto the ellipsoid of the Earth. The pixel values represent detected magnitude. Phase information is lost. The resulting product has approximately square spatial resolution and square pixel spacing with reduced speckle due to the multi-look processing. The noise vector annotation data set is part of the product annotations and contains thermal noise vectors. Thus users can apply a thermal noise correction by subtracting the noise from the power detected. The thermal noise correction is, for example, supported by the Sentinel-1 Toolbox (S1TBX).

GRD products are available in three resolutions, characterised by the acquisition mode and the level of multi-looking applied::

  • Full Resolution (FR), available in SM mode
  • High Resolution (HR), available in SM an IW mode
  • Medium Resolution (MR), available in SM, IW and EW mode

For the IW and EW GRD products, multi-look is performed on each burst individually. All bursts in all sub-swaths are then seamlessly merged to form a single, contiguous, GRD image per polarisation channel. The data are also available in COG format.

Availability / Temporal coverageEurope coverage:  2014-10 - now
World coverage:  2014-10 - now
UpdatesSystematic continuous ingestion
Access interfacesData Explorer
S3 from cloud environment
S3 Remote Transfer
Path to repository/eodata/Sentinel-1/RAW/GRD
Sensor ModeEW, IW, SM, WV
Data TypeUnfocused SAR raw data
File FormatGeoTIFF
Processing LevelLEVEL0
Resto PlatformS1A,S1B
Resto CollectionSLC
Resto InstrumentSAR
Vertical Coverage46.5N - 55.0N
Horizontal Coverage5.0E - 14.6E