Remote Sensing Image Processing Software

ATCOR-4-Airborne

Atmospheric and Topographic Correction for Wide FOV Airborne Optical Scanner Data

The airborne ATCOR®-4) corrects small and wide FOV airborne optical and thermal scanner data. It interpolates the solution from an extensive Modtran®-derived atmospheric database for typical flight altitudes and solar geometries.

ReSe Applications LLC

Wil, CH

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Description

For computational efficiency, there are separate modules for flat and rugged terrain imagery. A large "monochromatic" database of atmospheric correction functions comes with the ATCOR-4 model. The database was compiled with the Modtran^®-5 code (DISORT, 8 stream option). It comprises the altitudes 0 km to 10 km and 20 km (1 km increment, with occasional larger gaps). For a given sensor and range of operating altitudes the corresponding altitude files from the monochromatic database have to be resampled with the spectral filter functions of all channels.

The software offers these key advantages:

Bottom of atmosphere reflectance calculation with constant atmospheric conditions or spatially varying aerosol conditions
Retrieval of atmospheric water vapor column for sensors with water vapor bands (around 820/940/1130 nm), using the APDA method
Aerosol optical thickness retrieval using the dark dense vegetation (DDV) or the shadow based (SHAOT) method
Statistical haze removal through use of a fully automatic algorithm that masks haze and cloud regions and removes haze of land areas
Cirrus cloud removal (requires a narrow 1.38 micron band)
De-shadowing of cloud/building cast shadow areas using image-based shade detection routines
Empirical BRDF correction of irradiance effects
Model based observation angle dependent BRDF correction (BREFCOR method)
Optional quick topographic correction (without atmospheric correction)
Inflight radiometric calibration to calculate gain and offset from known target surface reflectances
Inflight at-sensor radiance validation using ground target reflectances
Automatic classification of spectral surface reflectance (program SPECL) using 12 surface cover templates
Surface emissivity and surface (brightness) temperature maps for thermal band sensors
Spectral polishing of reflectance cube (only hyperspectral imagery)
Value added products side outputs (LAI, FAPAR, etc.)
Correction of spectral "smile" (across track variation of the spectral position of spectral bands for hyperspectral instruments)
Adaption of solar reference spectrum
Diffuse and direct illumination components side outputs
The atmospheric database includes a wide range of pre-calculated radiative transfer runs for different weather conditions and sun angles employing the Modtran®-5 code
Works for hyperspectral, multispectral, thermal, and panchromatic imagery

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Specifications

Application: Main users

Data provider and surveyors, data analysis specialists.

Main applications

Scientific data analysis, high accuracy spectral processing.

Distinguishable features

Atmospheric and topographic correction of small and wide FOV sensors, operational BRDF effects correction (BREFCOR), MODTRAN-6 radiative transfer code based automatic processing.

General: Year of introduction

2001

Year of last update

2021

Supported hardware

Windows, Linux, MacOSX, suitable for all kind of airborne multispectral, thermal and hyperspectral sensors.

User definable operations and extensions

Batch processing

Radiometric and image processing: Radiometric corrections

Atmospheric correction, reflectance retrieval, topographic correction, BRDF correction.