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This is an overview of the readily available physical atmospheric compensation packages for satellite imagery:

Feature
ATCOR-IDL
(ReSe / DLR)
ATCOR Worflow
for Imagine (Geosystems)
ATCOR (Geomatica)
FLAASH
(ENVI / SSI)
System Features
Supported Operating Systems
Windows, Linux, MacOSX
Windows
Windows, Linux
Windows, Linux
Base Software
IDL VM (free)
Erdas Imagine
PCI Geomatica
ENVI
Hyperspectral
yes
no
limited
yes
Extreme Tilt Angles
no
no
no
yes
Batch Processing
yes
yes
yes
no
Workflow Integration
no
yes
yes
no
Correction Features
Terrain Correction
yes
yes
yes
no
Variable Visibility
yes
yes
yes
yes
Aerosol Type Detection
yes
yes
no
no
Adjacency Effect
yes
yes
yes
yes
Water Vapor Retrieval
yes
yes
no
yes
Haze Removal
yes
yes
limited
no
Cirrus Cloud Removal
yes
yes
no
no
Cloud Shadow Removal
yes
no
no
no
Preview of Spectra and Inflight Calibration
yes
no
yes
no
Physical Observer BRDF Correction
yes
no
no
no
Spectral Smile Correction
yes
no
no
no
Spectral Polishing
yes
no
no
yes
Empirical Line Correction
yes
no
yes
yes (ENVI)
Surface Temperature/Emissivity
yes
yes
yes
yes (ENVI)
Rugged Terrain Features
Terrain Height (DEM)
yes
yes
yes
no
DEM illumination Effects
yes
yes
yes
no
Incidence BRDF Correction
yes
yes
no
no

Note: Information about the Airborne Version (ATCOR-4) may be found here.