Recommended aerosol retrieval settings to use in FLAASH for WorldView-2 datasets

FLAASH includes a method for retrieving the aerosol amount and estimating a scene average visibility using a dark pixel reflectance ratio method based on work by Kaufman et al. (1997). The dark-land pixel-retrieval method requires the presence of sensor channels around 660 nm and 2100 nm. A dark-land pixel is defined to be one with a 2100 nm reflectance of 0.1 or less and a 660:2100 reflectance ratio of approximately 0.45. If the input image contains bands near 800 nm and 420 nm, an additional check is performed, requiring the 800:420 radiance ratio to be 1 or less, which eliminates pixels likely to be shadows and water bodies.

 

The following are the suggested values to use for aerosol retrieval for WorldView-2 datasets:

enviacc.prj.kt_upper_channel = 5

enviacc.prj.kt_lower_channel = 1

enviacc.prj.kt_cutoff = 0.0200

enviacc.prj.kt_ratio = 0.5000

 These are taken from an article from Spectral Sciences, Inc

Review on 12/31/2013 MM