January 19, 2006
This image ASAR APP image shows Edmonton (large bright patch in the upper right section) in the Canadian province of Alberta. This city, known as the Gateway to the North, is a commercial, manufacturing, and transport center situated in a rich agricultural and mining area. The North Saskatchewan river, the bright line in the middle part of the image, crosses the city from east to west. In the bottom left corner a part of Pigeon lake is clearly visible. The image results from a color composite where the red channel contains the HH polarized image, the green channel contains the VV polarized image and the blue channel the first principal component of these two images. Working with the first principal component as the third channel allows highlighting the contribution of each polarized image. Bright and grey tones reveal no significant change between HH and VV polarized images. The magenta shade, visible over area with a relatively high surface-scattering areas such as lakes and urban areas indicates a stronger backscatter in HH. The green color that dominates the image results from the extensive agricultural fields in this area (strong VV backscatter). The different shade of green depends on crop type and moisture conditions.
- Satellite: Envisat
- Instrument: ASAR
- Acquisition: 17-Feb-2003
- Orbit nr: 05055
- Center coordinates: lat. 53.42, lon. -113.8
Topics: Shades of red, digital photography, Physics, Magenta, Orb, Polarization, Channel, Broadcast engineering, Envisat, Electromagnetic radiation