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Satellite Data and Processing at CAPITA

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Satellite Data and Processing at CAPITA – PowerPoint PPT presentation

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Title: Satellite Data and Processing at CAPITA


1
Satellite Data and Processing at CAPITA
2
GOES 8
  • Images for every ½ hour processed daily
  • Processing includes georeferencing and gamma
    correction

3
MODIS
  • High resolution (250 m) color images
  • Data collected as needed

4
SeaWiFS Global Images
  • Images collected daily
  • 4 km resolution
  • Processing includes joining two images to create
    global view of a single day

5
High Resolution SeaWiFS Processing
  • In addition to the global data, processing is
    done on 1 km resolution SeaWiFS data gathered
    from various receiving stations
  • Daily images are downloaded in raw Level 1a
    form and are processed in several steps
  • Conversion from L1a engineering values to L1b
    scientific values
  • Georeferencing
  • Calculation of angle data for each pixel
  • Splicing multiple images and cropping to achieve
    the desired geospatial coverage
  • Rayleigh correction to remove Rayleigh scattering
    (the blue sky)
  • A batch of daily images is then used to form a
    composite minimum reflectance image
  • The minimum image is compared with the daily
    images to create daily aerosol optical depth maps

6
SeaWiFS Processing - Rayleigh Correction
Spliced, georeferenced L1b image without Rayleigh
correction
Rayleigh corrected image
7
SeaWiFS Processing Minimum Image Generation
At each pixel, the darkest value from a series of
daily images is used to create the composite
minimum image. This removes clouds and haze.
8
SeaWiFS Processing - Aerosol Optical Depth
  • This is a measure of the excess reflectance at a
    location on a given day
  • Cloudy areas are ignored

Daily image and cloud mask
Retrieved aerosol optical depth (band 1)
Minimum image
9
Retrieved Optical Depth
2000.08.12
10
Retrieved Optical Depth
2000.08.15
11
Retrieved Optical Depth
2000.08.18
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