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+--- Thread: ATCOR with AISA (/showthread.php?tid=57)
ATCOR with AISA - rese_support - 08-Oct-2014
nishi
nishda@gmail.com
Dear All,The AISA data we acquired were first process with FLAASH (ENVI) with funny results in vegetation samples. What other parameters need to be acquired for atmospheric correction using ATCOR-4? Do we need to know the exact parameters during flight campaign? Thanks. Nishi
Re: ATCOR with AISA
admin
daniel@rese.ch
ATCOR is mostly self-contained for atmospheric correction. For well-calibrated hyperspectral systems, no atmospheric parameters are required as long as the 940 nm (or 1130 nm) water vapor band is in the data, and if there are dark (vegetation) areas in the image for aerosol retrieval.The most important auxiliary parameters you need are:- calibration constants for the AISA system- a digital elevation model if working in terrain- scan angles file (view zenith angle per pixel)- time, location, heading, flight altitude
Re: ATCOR with AISA
nishi
nishda@gmail.com
86.15.188.20
Hello,These are information I manage to get for the airborne campaign:-We are using AISA Eagle and Hawk with 18.5mm and 22.5mm fore optics lens. So that the scan angles will be :- for AISA Eagle,FOV`s per pixel = 36.7 degreeIFOV`s = 0.036 degree for AISA HawkFOV`s = 24.0 degreeIFOV`s = 0.075 degreeRoll correction, pitch correction and Yaw correction.Time, location, heading and flight altitude. What do you mean by the calibration constant for the AISA system, is it the boresight calibration?With these information, is it sufficient to run ATCOR???Many thanks.
Re: ATCOR with AISA
admin
daniel@rese.ch
213.196.186.52
The geometric calibration is to be provided by a scan angle file containing view zenith and azimuth.The mentioned calibration constants should be the radiometric gain (c1) and offset (c0) of the equation:L_s = c0 + c1*DNgiven for each spectral band. Daniel