January 16, 2006
This ASAR APP image shows Toulouse (yellow/orange tones in the bottom center of the image) within the Garonne Valley. The Garonne, principal river of southwestern France, crosses Toulouse from south to northwest. The image is a color composite. The Red channel contains the HH polarized image, the green channel contains the VV polarized image and the blue channel contains the ratio between the amplitude in VV and HH. Urban areas are visible in yellow orange tones indicating a stronger HH backscatter. The yellow tones that dominate the image result from the agricultural areas within the valley and dense vegetation (forest) producing equally high backscatter in HH and VV. On the northwest side of Toulouse, The Toulouse-Blagnac International Airport is visible in black. This image demonstrates the increased capabilities of the Advanced Synthetic Aperture Radar (ASAR) onboard the ENVISAT satellite as compared with the SAR sensor onboard the earlier ERS generation of satellites. The ENVISAT ASAR instrument is the first permanent space borne sensor to incorporate dual polarization capabilities. Because the reflective properties of a surface are dependent on the polarization of the incoming radar signal, the use of more than 1 type of polarization provides with valuable extra information.
- Satellite: Envisat
- Instrument: ASAR
- Acquisition: 22-Mar-2003
- Orbit nr: 05530
- Center coordinates: lat. 43.67, lon. 1.47
Topics: Envisat, Radar, European Space Agency, Environment, Blagnac, Polarization, Toulouse, Synthetic aperture radar, Spaceflight