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)
Details
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.
he 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.
Availability
- Germany: 2014-10 - now
- Europe: 2014-10 - now
- Global: 2014-10 - now
Updates
- Systematic continuous updating
Usage requirements
There are certain requirements that must be met for use. Some data or services require an individual application. For more information, please contact CODE-DE Support.
| Required? | Remark | |
| Registration on CODE-DE | No | --- |
| Cloud resources on CODE-DE | No | --- |
| Individual request | No | --- |
Access
Depending on the environment and the intended use, there are several ways to access the data:
- EO Browser: -
- Data Explorer:
- Data Catalogue: CODE-DE or CREODIAS
- Path to repository on a Virtual Machine:
- /codede/Sentinel-1/SAR/GRD
- /eodata/Sentinel-1/SAR/GRD
More information
Further information on this product can also be found on the following external pages:
Terms of use
Use of the product is subject to the following terms of use:
