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GIS coaching for territorial management.

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Author: Atilio Francois

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ArcMap Image Classification Tutorial: 2.5- Exploring Data

Different multi spectral data bands have, often, a very high correlation and contain similar information. For example, the sensors of Landsat MSS bands 4and 5 (green and red respectively) produce visual images with very similar appearance…

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Add Orfeo Toolbox to QGis 3.X

If you have used the processing provider Orfeo TB with QGis 2.X and you look for it in the new version 3, you will be disappointed. Indeed, the Orfeo plugin rewriting has taken a little more…

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Image classification tutorial with QGis: 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…

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ArcMap Image Classification Tutorial : 2.3- The spatial filters

 The spatial filters represent another method of digital processing used for the enhancement of an image. These filters are designed to bring out or remove specific features of an image based on their spatial frequency. The…

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Online help to find the right colours of your map.

Depicting a map is not just a matter of personal taste. If our purpose is essentially to convey certain information in the clearest way possible, we must not forget that the format and final use of…

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Introduction to exploratory data analysis for geostatistics

Here is a small series of articles motivated by a somewhat broad question from a student using ArcGis Geostatistical Analyst: how to interpret the QQplot, the trend analyst and the variogram? Whether it is Geostatistical Analyst…

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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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