Introduction

Sentinel-1 is currently the only system to provide SAR images regularly on all lands on the planet. Access to these time series of images opens an extraordinary range of applications. In order to meet the needs of a large number of users, including our needs, we have created an automatic processing chain to generate “Analysis Ready” time series for a very large number of applications.

With S1Tiling, Sentinel-1 data is ortho-rectified on the Sentinel-2 grid to promote joint use of both missions.

⤖

S1Tiling was developed within the CNES radar service, in collaboration with CESBIO, to generate time series of calibrated, ortho-rectified and filtered Sentinel-1 images on any lands on the Earth. The tool benefits for the SAR ortho-rectification application from the Orfeo Tool Box.

The resulting images are registered to Sentinel-2 L2 optical images, using the same MGRS geographic reference grid (S2 tiling system - kml file). This Python software, is based on the Orfeo Tool Box (OTB) image processing library, developed by CNES. Different Sentinel-1 data providers can be used like PEPS or Copernicus Scihub. It can be used on any type of platform, from a large computing cluster to a laptop (the fan will make some noise during processing). It is considerably faster than the ortho-rectification tool in SNAP, and can be easily used in script form.

S1Tiling is currently used for many applications, such deforestation detection in the Amazon, monitoring of rice crops in Southeast Asia or monitoring of water stocks in India. In addition, this software is accessible as an on-demand processing service on the French PEPS collaborative ground segment, in order to make it easier for users to use.