# Analysis-Ready Data for SAR (Sentinel-1)
Executable code for this guide can be found in a dedicated notebook (opens new window).
# Backscatter computation
Data from synthetic aperture radar (SAR) sensors requires significant preprocessing to be calibrated and normalized for terrain. This is referred to as backscatter computation, and provider in openEO Platform by
- and its CARD4L compliant variant, the
To perform a backscatter computation, the user has to load an
raw SAR data with the
and immediately apply ône of the processes to it.
These correction algorithms are typically tightly coupled with the raw data,
so it is important they are applied immediately after the
It is recommended to avoid any other operations in between.
# Reference implementations
This section shows a few working examples for these processes.
Please note that you need to connect and authenticate to openEO Platform first before you can execute any of the code snippets below. Details can be found in the corresponding Getting Started guides.
# CARD4L NRB for
SENTINEL1_GRD collection (provided by Sentinel Hub)
When working with the Sentinel Hub based
SENTINEL1_GRD collection, both SAR backscatter processes can be used.
The underlying implementation is provided by
Sentinel Hub (opens new window), and offers full CARD4L compliant processing options.
# Orfeo for other GRD collections (provided by VITO / TerraScope)
The Orfeo implementation currently only supports sigma0 computation, and is not CARD4L compliant.