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Author: Atilio Francois

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Image classification tutorial with ArcMap: 2.2- Images enhancement

To begin with, it is important to understand that image enhancement is applied to facilitate visual interpretation and understanding of images. The enhancement will not change the radiometric values ​​of the objects in the image;it will…

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Image classification tutorial with QGis: 2.1 Atmospheric adjustments of Landsat 8 images

We have previously seen how to correct Landsat images for TOA (top-of-atmosphere)reflectance. Here is a diagram that will help us understand the following: Therefore the reflectance we have calculated is the% of light reflected to the…

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Image classification tutorial with ArcMap: 2.1 Atmospheric adjustments of Landsat 8 images

Previously we discussed how to adjust Landsat images for the reflectance TOA (top-of-atmosphere). Here is a diagram that will help us to understand what happens next: Therefore the reflectance we have calculated is the% of light…

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Image classification tutorial with QGis: 2- Data pre-treatment and exploring

Pre-processing functions are operations that are typically required before performing the main analysis and retrieval of the information. Pre-processing operations are divided into radiometric corrections and geometric corrections. Radiometric corrections include, but are not limited to,…

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Image classification tutorial with ArcMap: 2- Data pre-treatment and exploring

Pre-processing functions are operations that are typically required before performing the main analysis and retrieval of the information. Pre-processing operations are divided into radiometric corrections and geometric corrections. Radiometric corrections include, but are not limited to,…

Read More
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Image classification tutorial with QGis: 1- Introduction

Firstly, a warning: this tutorial is not intended for users whose job is spatial image processing. It is intended for GIS users who need to engage in image processing in order to improve their data. The…

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  1. Atilio Francois on [EN]Download QGIS 4.0 Portable for Windows (Full & Lite Versions)5 June 2026

    Thank you for your feedback and for reporting these issues. The errors and the missing Processing functionality that you observed…

  2. Andrea on [EN]Download QGIS 4.0 Portable for Windows (Full & Lite Versions)5 June 2026

    I've downloaded today the 7z file from https://www.sigterritoires.fr/QGis4.0Lite, then unarchived it and then launched launch_qgis_portable.bat: various errors occurs https://dcmnt.eu/pad/#/2/pad/view/-6FZXEyJYV4SyZmDWWE4XW6M7l-1JGp0V67X4tBTdjg/embed/ and…

  3. Andrea on [EN]Download QGIS 4.0 Portable for Windows (Full & Lite Versions)5 June 2026

    It's not clear what are exactly the components that are missing in the "QGIS portable – lightweight version". Could you…

  4. Ed on [EN]Download QGIS 3.44 LTR Portable for Windows (Full Version)2 June 2026

    Thank you for your service to the community! Please know that you are greatly appreciated! We prefer using the Long…

  5. SERGIO SEBASTIAN VERDU on [EN]Download QGIS 4.0 Portable for Windows (Full & Lite Versions)27 May 2026

    Hi Atilio, I'm very interested in downloading these versions of QGIS, but I've tried several times and the download never…

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