Science Service System

Summary of Proposal LAN2708

TitleCombining TerraSAR-X and TanDEM-X in a quad-pol sensor
Investigator Weissgerber, Flora - Telecom Paristech, TSI
Team Member
Dr Koeniguer, Elise - ONERA, DTIM
Mrs Weissgerber, Flora - Telecom Paristech, TSI
Prof Nicolas, Jean-Marie - Telecom Paristech, TSI
Dr Trouve, Nicolas - ONERA, DEMR
SummaryThe objectives of the project are the understanding of urban scattering at various resolution, polarization and wavelength. The aims are to characterize the spectral and temporal stability of these scatterers as well as their polarimetric behavior. We also want to understand the variation with the resolution of classical second order polarimetric descriptors such as entropy. An application of this is the urban mapping and the update of urban map combining polarimetric and high resolution images. The analysis of the image and the comparison with single-pol image with a higher resolution and quad-pol images with a lower resolution will follow several steps.The first step is the comparison at a point like scatter level. By looking at their cross section, we will examine the effect of resolution on their response. We will also analyze the effect of the response of bright scatters on the scatterers close by. The localization and the stability of correlated scatterers and permanent scatterers will also be analyzed as a function of the resolution. The influence of the resolution on the spectrum of nearly canonical point-like scatterers will also be investigated. We will look more closely in the response of very stable and nearly deterministic areas containing different scattering mechanisms that are mixed in low resolution images and separated in high resolution images. We will also investigate the effect of the resolution on covariance matrices. Firstly we want to see if the resolution modifies the covariance matrices in homogeneous areas such as parks. Then we will try to point out the effect of the resolution on the estimation of covariance matrices. This analysis will be completed by the analysis of the effect of the resolution on second order polarimetric descriptors such as entropy. The data requested on this proposal are polarimetric images acquired byTerraSAR-X and TanDEM-X conjointly. The two satellites will performin bistatic mode, one satellite emitting and both receiving. TerraSAR-X would use its Dual-Polarization mode, emitting consecutively H and V. It would thus acquire HH and VV while TanDEM-X would acquire HV and VH. The final data will havea 2m by 1m resolution instead of the 6m by 2m resolution of the full polarization image acquired by TerraSAR-X alone. The envisaged test sites are the cities of San Francisco, Amsterdam and Paris. San Francisco is the privileged test site since various other data acquired over this cityare already at our disposal. We have already worked on the AIRSAR MLC, UAVSAR MLC and SLC, ALOS, Radarsat-2, TerraSAR-X Single-Pol Spoltlight HS, TerraSAR-X Dual Pol Spoltlight andTerraSAR-X Quad-Pol Stripmap images. For the city of Amsterdam, TerraSAR-X Quad-Pol images are available and we can also ask for archive images including Spotlight, High Resolution Spotlight and Stripmap in HH and VV. Multiple Sentinel-I images are also at our disposal. On the city of Paris, we have a temporal stack of 21 images acquired in interferometric condition from the LAN1746 project and some Sentinel-I images. The first deliverable of the project is a study of urban scatterers at various resolutions and polarizations. The second deliverable is an algorithm allowing to enhance the resolution of polarimetric images based on a single polarization image with a better resolution. The enhanced image will permit to use well-known method for image classification or characterization base onpolarimetric image. The third deliverable would be an algorithm of 3D mapping and map updating based on SAR imagery acquired at different resolutions and with different polarizations. This work is conducted in the Flora Weissgerber's thesis framework. She works with DGA (The French Defence Procurement Agency of French Ministry of Defence), ONERA (The French Aerospace lab) and Telecom-Paristech funding. Jean-Marie Nicolas, Elise Koeniguer and Nicolas Trouvé have time allocated to PhD management.

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