Remote sensing pre-processing
12 important questions on Remote sensing pre-processing
Which factors influence RS image acquisition?
- Atmosphere, wheather
- Earth surface (geometry)
- Acquisition method; satellite or aiirborne
What is the remote sensing processing chain?
- Preprocessing
- Image analysis
- Variables/products
- application
What is the spectral preprocessing chain?
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What is sensor calibration before launch?
- Pre-launch calibration
- Correctoin factors for all channels: (offset and gain)
What types of sensor calibration after launch are there?
- Vicarious calibration
What is on-board calibration?
What is vicarious calibration?
- Large homogeneous ground units
- Compare ground and satellite radiance
What can cause scene illumination?
- Earth-sun distance correction
- Standard procedures for correction
What are the two main processes of atmospheric correction?
- Absorption: energy reduction
What are the two main approaches of atmospheric correction?
- Complex radiative transfer based methods
What can be sources of geometric distortions of images?
- Earth rotation under the sensor while image is acquired
- Panoramic distortion due to the field of view of the sensor
- Topography of the terrain
What are systematic distortions?
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