Products & Services  Standard Data Products

 

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Standard Data Products

 

Satellite Imagery with appropriate geometric accuracy having spatial resolutions ranging from 2.5m to 20m is available and can be provided at a scale of 1:100000 to 1:10000.

 

Specifications

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Product

Satellite

Ground Resolution

2.5m color

SPOT-5

2.5m

2.5m B&W

SPOT-5

2.5m

5m color

SPOT-5

5m

5m B&W

SPOT-5

5m

10m color

SPOT-5

10m

10m B&W

SPOT-4
SPOT-2

10m
10m

20m color

SPOT-4
SPOT-2

20m
20m

 

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The satellite imageries are provided both in the form of hard copy (black & white and colour paper prints) and soft copies (CD ROM/DVD).

 

Image Processing Levels

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The imagery is offered in the following processed forms:

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Level 1A:

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Level 1A imagery is corrected by normalizing CCD response to compensate for radiometric variations due to detector sensitivity. No geometric corrections are performed. Level 1A preprocessing thus offers data in almost raw form.

 
 

Level 1B:

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Level 1B applies the same radiometric corrections as level 1A. Geometric corrections compensate for systematic effects, including panoramic distortion, the earth rotation and curvature and variations in the satellite orbital altitude.

 
 

Level 2A:

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Level 2A scenes are rectified to match a standard map projection (UTM/ WGS 84), without using ground control points. Geometric corrections use a re-sampling model that compensates for systematic distortions effects and performs transformation needed to project the image in a system of user choice. This model is based on known viewing parameters such as satellite ephemeric data, attitude etc and does not use external measurements.

 
 

Level 3 (Ortho):

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Level-3 imagery is geo-referenced and is also called orthoimage. It is preprocessed using a Digital Elevation Model (DEM). Geometric corrections "ortho-rectify" imagery using a re-sampling model that compensates for systematic distortion effects and performs transformations needed to project image in  a specified projection (Lambert conformal, UTM, oblique equatorial, polar stereographic, polyconic etc).

 

 

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