Difference between revisions of "IKONOS"

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[This page is under construction]
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IKONOS is a commercial earth observation satellite. Details about the sensor in Digital Globe's [http://www.digitalglobe.com/sites/default/files/DG_IKONOS_DS.pdf IKONOS Data Sheet]
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IKONOS is a commercial earth observation satellite. Details about the sensor are provided at Digital Globe's [http://www.digitalglobe.com/sites/default/files/DG_IKONOS_DS.pdf IKONOS Data Sheet]
  
 
== Availability (Sample Data) ==
 
== Availability (Sample Data) ==
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== Pre-Processing Overview ==
 
== Pre-Processing Overview ==
  
Tyipically, multispectral data are converted into ''Reflectance'' before they are subjected in multispectral analysis techniques (image interpretation, band arithmetic, vegetation indices, matrix transformations, etc.). As with remotely sensed data acquired by other sensors, IKONOS raw image digital numbers (DNs) can be converted to physical quantities such as at-sensor Radiance or Reflectance. The latter can be differentiated in ''Top of Atmosphere Reflectance'' (ToAR) which does not account for atmospheric effects (absorption or scattering) and in ''Top of Canopy Reflectance'' (ToCR) which introduces a "correction" for atmospheric effects.  
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Typically, multispectral data are converted into ''Reflectance'' before they are subjected in multispectral analysis techniques (image interpretation, band arithmetic, vegetation indices, matrix transformations, etc.). As with remotely sensed data acquired by other sensors, IKONOS raw image digital numbers (DNs) can be converted to physical quantities such as ''at-sensor Radiance'' or ''Reflectance''. The latter can be differentiated in ''Top of Atmosphere Reflectance'' (ToAR) which does not account for atmospheric effects (absorption or scattering) and in ''Top of Canopy Reflectance'' (ToCR) which introduces a "correction" for atmospheric effects.  
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Converting to Top of Atmosphere Reflectance, also referred to as Planetary Reflectance, can be done by using the following equation:
 
Converting to Top of Atmosphere Reflectance, also referred to as Planetary Reflectance, can be done by using the following equation:
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* GRASS-Wiki page about [http://grasswiki.osgeo.org/wiki/Image_processing Image Processing]
 
* GRASS-Wiki page about [http://grasswiki.osgeo.org/wiki/Image_processing Image Processing]
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Revision as of 05:22, 26 July 2013

[This page is under construction]

IKONOS is a commercial earth observation satellite. Details about the sensor are provided at Digital Globe's IKONOS Data Sheet

Availability (Sample Data)


Pre-Processing Overview

Typically, multispectral data are converted into Reflectance before they are subjected in multispectral analysis techniques (image interpretation, band arithmetic, vegetation indices, matrix transformations, etc.). As with remotely sensed data acquired by other sensors, IKONOS raw image digital numbers (DNs) can be converted to physical quantities such as at-sensor Radiance or Reflectance. The latter can be differentiated in Top of Atmosphere Reflectance (ToAR) which does not account for atmospheric effects (absorption or scattering) and in Top of Canopy Reflectance (ToCR) which introduces a "correction" for atmospheric effects.


Converting to Top of Atmosphere Reflectance, also referred to as Planetary Reflectance, can be done by using the following equation:

Failed to parse (lexing error): \rho_p = \pi * L\lambda * d^2 / ESUN\lambda * cos(θ_S)

where:

  • \rho - Unitless Planetary Reflectance
  • \pi - mathematical constant (3.14159265358)
  • L\lambda spectral Radiance at the sensor's aperture, from equation... ToADD
  • d - Earth-Sun distance in astronomical units, interpolated values
  • Esun - Mean solar exoatmospheric irradiance(s) (W/m2/μm), interpolated values
  • Failed to parse (lexing error): cos(θ_s) - Solar zenith angle, from the image acquisition's metadata

Modules overview

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Pre-Processing

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Importing data

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Color composites

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Pan Sharpening

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Calculate Planetary Reflectance

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References / Sources

See also


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Atmospheric correction

See Atmospheric correction

IKONOS Image classification

See Image classification