Hyperion Pre-processing

Based on more than 30 years of experience with hyperspectral remote sensing, and 5 years intensive work with Hyperion, we have developed automated routines that very greatly reduce the time required for processing of Hyperion data. We now offer Pre-processing and Analysis of Hyperion imagery. Call for a quotation.

Hyperion Pre-processing includes the following:

Process and converts the Hyperion HDF data to radiance in preparation for atmospheric corrections in FLAASH or ATREM

• Imports Level 1R (*.L1R) data format.
• Discards invalid and duplicate bands.
• Converts the data to Radiance by scaling the VNIR and SWIR bands.
• Corrects bad pixels identified by the Flag Mask supplied by the L1R file.

Performs cross-track destriping and flattening of the data cube

• Splits datasets into VNIR and SWIR bands and prepares image for identification of the SWIR 'smile band'.
• Creates mask file used in de-striping and flattening (user controlled).
• De-stripes and flattens image.
• Corrects spectral smile.

Atmospheric Correction

FLAASH modelling: We then use FLAASH in the image processing package ENVI to estimate Ground Level Reflectance.

Empirical Line Correction/Vicarious Calibration:

• Our experience indicates that FLAASH modelling is often not adequate. We recommend that people also do at least comparisons with on-the-ground Reflectance measurements.
• If you provide ASD or GER Reflectance spectra of large pseudo-invariant targets within the image (parking lots, road intersections), and or more difficult simultaneous Reflectance spectra of plowed fields, or homogenous vegetation, we can make comparisons and if necessary empirical corrections of the image data.

Geo-rectification of Hyperion imagery

• This is done by using Ground Control Points automatically picked from well corrected reference imagery.
• If you provide line vectors, or a few reference GPS locations, we can provide a check on the accuracy of this geo-referencing.

Hyperspectral Analysis of Hyperion imagery

• If you do not have in-house hyperspectral expertise or capability, we can also offer more than 30 years hyperspectral experience, and 5 years experience with Hyperion.
• We have developed many specialized analytical procedures for Hyperion.
• We use the latest Geomatica and ENVI hyperspectral software.

   
Last update October 25 2007
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