Digital Signal Processing Reference
In-Depth Information
SPOT satellite spectral bands and resolutions
From raw images to digital satellite image maps
SPOT images come with different levels of geometric preprocessing, divided into 2 product
lines:
SPOT Scene (
Used in this research study
)
level 1A:
Radiometric correction of distortions due to differences in sensitivity of the elementary
detectors of the viewing instrument. Intended for users who wish to do their own geometric image
processing.
level 1B:
Radiometric correction identical to that of level 1A. Geometric correction of systematic
effects (panoramic effect, Earth curvature and rotation). Internal distortions of the image are
corrected for measuring distances, angles and surface areas. Specially designed product for photo
interpreting and thematic studies.
level 2A:
Radiometric correction identical to that of level 1A. Geometrical correction done in a
standard cartographic projection (UTM WGS84 by default) not tied to ground control points.
Allowing for possible differences in location, this product is used to combine the image with
geographical information of various types (vectors, raster maps and other satellite images).
Image format
The default SPOT Scene delivery format is DIMAP SPOT Scene profile. The only exceptions are
2.5-metre and 5-metre colour SPOT Scene 2A products, which are delivered in DIMAP SPOTView
profile format.
SPOTView
level 2B (Precision)
: This product comes in a map projection with ground control points taken on
maps or from GPS type measurements taken in the field. The image is corrected for a mean
elevation in a projection and a standard map frame.This product is used when deformations due to
relief are not that important (flat ground, etc.).
level 3 (Ortho):
Map projection based on ground control points and a DEM based on Reference3D
data to eliminate distortions due to relief.
Image format
SPOTViews are delivered in DIMAP SPOTView profile format.
Search WWH ::
Custom Search