How to Perform FLAASH Atmospheric Correction in ENVI | Step-by-Step 🌐

Hello and welcome back to TechStarPlus]! 🌍 In today’s video, we’ll guide you through a complete step-by-step process on how to perform FLAASH Atmospheric Correction in ENVI software. Atmospheric correction is crucial for enhancing satellite imagery by removing the effects of atmospheric interference like haze and scattering. Stay tuned as we walk you through each step for a perfect correction. Let’s get started! 🚀

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Segment 1: What is FLAASH Atmospheric Correction?
"FLAASH, or Fast Line-of-sight Atmospheric Analysis of Spectral Hypercubes, is an advanced atmospheric correction tool in ENVI. It’s designed to correct multispectral and hyperspectral imagery by accounting for atmospheric effects like water vapor, aerosols, and scattering. This process enhances the quality of your imagery and ensures accurate reflectance values, making it essential for remote sensing analysis. 📈✨"

Segment 2: Preparing the Data
"Before starting the FLAASH correction, ensure that you have the necessary data ready:

Input Image: Multispectral or hyperspectral image (e.g., Landsat 8, Sentinel-2).
Metadata File: This file contains crucial information about the image acquisition.
Spectral Library: To support accurate atmospheric correction. Make sure your data is pre-processed, and the metadata is correctly attached to your image file. 🗂️🔍"

Segment 3: Opening the Image in ENVI
"Open ENVI software and load your image file:

Click on ‘File’ ‘Open’ and select your input image.
Ensure that the image is displayed in the Data Manager.
Verify that the metadata is correctly read by ENVI; this will help the FLAASH tool use the right parameters. With your image loaded, we are ready to start the atmospheric correction. 📊🖥️"


Segment 4: Running FLAASH Atmospheric Correction
"Now, let’s dive into the FLAASH process:

Go to ‘Toolbox’ and search for FLAASH Atmospheric Correction.
Select FLAASH from the list; the FLAASH input parameters window will open.
In the input window:
Input Radiance File: Select your loaded image file.
Ground Elevation: Enter the elevation value of your study area (in kilometers).
Sensor Type: Choose the correct sensor (e.g., Landsat 8).
Atmospheric Model: Select the appropriate model based on your region (e.g., Tropical, Mid-Latitude).
Aerosol Model: Choose the aerosol model (e.g., Rural, Urban).
Click on ‘Apply’ to start the correction process. FLAASH will now process your image, which might take a few minutes depending on the image size and your system configuration. ⏳⚙️"

Segment 5: Reviewing the Output
"Once the FLAASH correction is complete:

The corrected image will be loaded into the Data Manager.
Open the corrected image and compare it with the original to observe the changes. You should notice a reduction in haze and more accurate reflectance values.
Use the Spectral Profile Tool to verify the atmospheric correction by checking the reflectance values.
Atmospheric correction helps in obtaining true surface reflectance, making your analysis more reliable. 🌈✅"

Segment 6: Saving the Corrected Image
"To save your corrected image:

Go to ‘File’ ‘Save As’.
Choose the output format (e.g., GeoTIFF).
Enter a file name and save it to your desired location. Make sure to document the processing steps for future reference. 🗂️💾"

Searching Points:
How to create FLAASH atmospheric correction in ENVI
FLAASH atmospheric correction ENVI tutorial
Atmospheric correction in ENVI using FLAASH
ENVI FLAASH module tutorial
Step-by-step FLAASH correction ENVI
Atmospheric correction for satellite imagery in ENVI
How to use FLAASH in ENVI
Applying atmospheric correction in ENVI
FLAASH ENVI guide for beginners
ENVI atmospheric correction for remote sensing
FLAASH settings in ENVI
ENVI tutorial for FLAASH correction
Accurate atmospheric correction ENVI
Removing atmospheric distortion in ENVI
FLAASH for accurate reflectance ENVI

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