In this tutorial, we learn how to perform an atmospheric correction of a Landsat 8 image using the ENVI software using FLAASH Atmospheric Correction Tool.
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What is 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. FLAASH works with most hyperspectral and multispectral sensors. Water vapor and aerosol retrieval are only possible when the image contains bands in appropriate wavelength positions. FLAASH can correct images collected in either vertical (nadir) or slant-viewing geometries.
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FLAASH Processing:
Step 1: Calibrate the Image to Radiance
Step 2: FLAASH Atmospheric Correction Tool
Enter Scene and Sensor Information
Enter Water Vapor and Aerosol Information
Create the Reflectance Image
Step 3: Band Math
1- Click the Advanced Settings button of the FLAASH Parameters dialog, then change the Output Reflectance Scale Factor to 1. Re-run FLAASH. Processing will take longer because ENVI creates a floating-point reflectance image.
2. Use the Band Math tool to divide the reflectance pixel values ​​by 10,000 (best way)
Expression for maximum and minimum value
(B1 le 0) * 0 + (B1 ge 10000) * 1 + (B1 gt 0 and B1 lt 10000) * float (b1) / 10000
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If you need the manual for FLAASH atmospheric correction, please contact me by writing your email id in the comments section below.
Related tags:
#Fast Line-of-sight Atmospheric Analysis of Hypercubes (FLAASH)
#atmospheric_correction
#remote_sensing
#radiometric correction
#Atmospheric correction using Flaash
#ENVI atmospheric correction
#FLAASH
#Processing ENVI
#Landsat 8 (OLI)
#ENVI
#Envi tutorial
#Image processing