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What is flaash and what does it do?
FLAASH is a first-principles atmospheric correction tool that corrects wavelengths in the visible through near-infrared and shortwave infrared regions, up to 3 µm. (For thermal regions, use the Toolbox option Radiometric Correction > Thermal Atmospheric Correction .)
How is flaash used in AVIRIS preprocessing?
Preprocessing AVIRIS Data Tutorial (demonstrates the use of FLAASH) FLAASH is a first-principles atmospheric correction tool that corrects wavelengths in the visible through near-infrared and shortwave infrared regions, up to 3 µm.
What is the default radiance scale factor for flaash?
The Radiance Scale Factors dialog appears. If you used the Radiometric Calibration tool to create a radiance image for input into FLAASH, leave the default value of 1 for the Single Scale Factor field of the Radiance Scale Factors dialog. ENVI has already applied the correct scale factor needed to get the image into units of µW/ (cm 2 * sr * nm).
What do you need to know about ENVI flaash?
ENVI’s atmospheric correction module, FLAASH (Fast Line-of-sight Atmospheric Analysis of Spectral Hypercubes), is a first-principles atmospheric correction modeling tool for retrieving spectral reflectance from hyperspectral radiance images. With FLAASH, you can accurately compensate for atmospheric effects.
How do you do atmospheric correction in flaash?
The FLAASH Atmospheric Correction Module Input Parameters dialog appears. Click Input Radiance Image. The FLAASH Input File dialog appears. Select an input image and perform optional spatial subsetting, then click OK. If you select a spatial subset, you can modify the image extents further in the FLAASH Advanced Settings dialog if needed.
What kind of image do you need for flaash?
The input image for FLAASH must be a radiance image in band-interleaved-by-line (BIL) or band-interleaved-by-pixel (BIP) format. The input image can be floating-point, long integer (4-byte signed), or integer (2-byte signed or unsigned). If your image does not meet the first two criteria, use the Radiometric Calibration tool to open the image.