Title: Satellite Data and Processing at CAPITA
1Satellite Data and Processing at CAPITA
2GOES 8
- Images for every ½ hour processed daily
- Processing includes georeferencing and gamma
correction
3MODIS
- High resolution (250 m) color images
- Data collected as needed
4SeaWiFS Global Images
- Images collected daily
- 4 km resolution
- Processing includes joining two images to create
global view of a single day
5High 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
6SeaWiFS Processing - Rayleigh Correction
Spliced, georeferenced L1b image without Rayleigh
correction
Rayleigh corrected image
7SeaWiFS 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.
8SeaWiFS 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
9Retrieved Optical Depth
2000.08.12
10Retrieved Optical Depth
2000.08.15
11Retrieved Optical Depth
2000.08.18