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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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Recent articles

  • Converting a class raster to a fuzzy raster in QGIS
  • Converting a raster into fuzzy values with FuzzyAttributes V2
  • Consultation and negotiation: the contribution of fuzzy logic
  • PostGIS 3.6 released – 3D, raster, and topology take a leap forward
  • Creating awareness maps with QGIS: the equivalent of the Above and Below style

Recent comments

  1. Atilio Francois on How to develop an application with pgrouting in Windows (1)25 August 2025

    You're right — since 2019 Geofabrik no longer provides plain `.osm` files, only the compressed `.osm.pbf` format. The tool **osm2pgrouting**…

  2. Simon on How to develop an application with pgrouting in Windows (1)25 August 2025

    The osm downloads don't appear to be available, just osm.pfb And osm2pgrouting on Windows doesn't like pbf "not well formed…

  3. Arno on Portable version of QGis 3.32.021 August 2025

    I just want to thank you. It works.

  4. Atilio Francois on Portable version of QGis 3.32.015 May 2025

    What is the link between the qgis update and the portable version? A portable version cannot be updated; it must…

  5. Hugo on Portable version of QGis 3.32.014 May 2025

    For me, the error message complaining that qgis_app.dll is missing started appearing following the most recent QGIS update.

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