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THEOS Products

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 The THEOS imagery product is available in a variety of product options. These product options use different spectral band combinations and imply differences in the pixel resolution of the final product.

Product Option
Black & White
Blue
Green
Red
Near Infrared
Resolution
Panchromatic
x
-
-
-
-
2 meter
Multispectral
-
x
x
x
x
15 meter
Pan-Sharpened
x
x
x
x
x
2 meter

Sampled THEOS data products
Multispectral Products
Panchromatic Products
Pan-Sharpened Products
THEOS panchromatic products provide 2 meter resolution (at nadir) and 8 bits information depth. The output scene is a square scene of 22 km. x 22 km. .
THEOS multispectral products provide 15 meter resolution (at nadir) and 8 bits information depth. All four bands are delivered as one file. The output scene is a square scene of 90 km. x 90 km.
THEOS imagery products are also available in a 4-band pan-sharpened product option. These products combine the visual information of 4 multispectral bands (blue, green, red, Near IR), with the spatial information of the panchromatic band. Pan-Sharpened products are available as product option for level 2A only. The output scene is a square scene of 22 km. x 22 km.

Corrective Levels

THEOS products are provided into two correction levels:

  • System Corrected Level (1A)
    Level 1A images are radiometrically corrected: in addition to level 0 pre-processing operation, the detector equalization and radiometric abnormality removal (missing lines, invalid detectors, and compression errors) are performed.
    The PAN band and the MS reference band B1 are always geometrically raw.
    Level 1A products are geo-referenced: it means that product annotations provide information about the image localization. (detail)
  • Geo-Corrected Level (2A)
    Level 2A images are radiometrically corrected and geocoded, i.e. resampled on a cartographic grid.
    Level 2A Imagery products are suitable for users requiring modest absolute accuracy and/or large area coverage. Users of Standard Imagery products usually possess sufficient image processing tools and knowledge to manipulate and exploit the imagery for a wide variety of applications. ) (detail)

Area Type

  1. Single Strip
    • Product Options: PAN (22 km wide) or MS (90 km wide) or PAN Sharpened (22 km wide)
    • Customer specifies center(lat/long in degree) and length (km)
    • One scene minimum is required (PAN or PAN Sharpened: 22X22 km,
      MS: 90X90 km)
  2. Single Strip: Stereo Forward/After
    • Product Options: PAN (22 km wide) or MS (90 km wide)
    • Customer specifies center(degree) and length (km)
    • One scene minimum is required (PAN or PAN Sharpened: 22X22 km,
      MS: 90X90 km)
  3. Single Strip: Stereo Right/Left
    • Product Options: PAN (22 km wide) or MS (90 km wide)
    • Customer specifies center(degree) and length (km)
    • One scene minimum is required (PAN or PAN Sharpened: 22X22 km,
      MS: 90X90 km)
  4. Rectangle
    • Product Options: PAN or MS or PAN Sharpened
    • Customer specifies at least upper left and lower right corner coordinates (degree)
    • One scene minimum is required (PAN or PAN Sharpened: 22X22 km,
      MS: 90X90 km)
  5. Polygon
    • Product Options: PAN or MS or PAN Sharpened
    • Customer specifies all coordinates (maximum of 20) provided in counter clockwise
    • One scene minimum is required (PAN or PAN Sharpened: 22X22 km,
      MS: 90X90 km)

 
 
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