As of 9 February 2017, the Pléiades and SPOT 6/7 commercial offers have been enriched with additional Radiometry and Geometry imagery processing options.
As of 9 February 2017, the Pléiades and SPOT 6/7 commercial offers have been enriched with additional Radiometry and Geometry imagery processing options.
New geometric processing: Projected
The image acquired in the plane of the sensor is projected onto a cartographic or geographic terrestrial plane. The plane is defined with a constant altitude, which is the mean height value over the area of interest.
Projected products include all the radiometric and geometric corrections of the Primary level (external orientation). An associated geometric model is described in an RPC file that can be directly integrated into image processing and analysis software.
Main benefits for users:
- Directly compatible with GIS environments
- Easier orthorectification by users who use their own reference layers (Ortho, GCPs and DEM…) thanks to the geometric model described in the embedded RPC file
New Radiometric processing: Reflectance
The image is radiometrically corrected from sensor calibration and systematic atmospheric effects (molecular or ‘Rayleigh’ diffusion). Cloud, cloud veil, haze, aerosol (pollution and sandstorm) remain.
Image values are provided in normalized reflectance values with a 1/10,000 ratio.
Main benefits for users:
- Correct the bluish effects from the atmosphere
- Obtain reliable true colors
- Ensure more stable luminosity/contrast on screen
- Prepare direct near seamless coverage (eg. Mosaicking…)
New Radiometric processing: Display
Display level products are generated from a new algorithm based on the Reflectance product. The Display level replaces the former OVR (Optimized Visual Rendering) option.
8-bit pixel coding should be requested since 16-bit pixel coding does not provide any additional information. Moreover, image files are lighter with 8-bit pixel coding.
Display processing should be selected when images need to be immediately displayed on screens with optimized visual rendering.
1-Radiometric Processing Basic:
2-Radiometric Processing Reflectance:
3-Radiometric Processing Display:
