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Author: Atilio Francois

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Updated 28/04/2017Migrate postgresql databases with PgAdmin4: problems and solutions

  The problem discussed in this article has been solved by the pgAdmin team (tested on the pgAdmin 1.4). If you come across this problem and you have a pgAdmin version older than version 4, just…

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Accuracy, uncertainty and linear alteration of geographic data (2)

In  the  previous article   we discussed the different geographic coordinate systems: astronomical, geocentric and geodetic coordinates. Let’s have a look at the possible sources of error.

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Accuracy, uncertainty and linear alteration of geographic data (1)

It is not easy, in geomatics, to get a good grasp of the geodesy notions that underlie the manipulation of geographic data. Unfortunately, many users do not have a sound knowledge of these concepts. I have…

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ArcHydro: determination of the watersheds of a territory (2)

In the previous article, ArcHydro: determination of the watersheds of a territory (1), we analysed points 1, 2, and 3. In this article, we will discussed the last three points: – Segmentation of the network flow…

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ArcHydro: determination of the watersheds of a territory (1)

We will use ArcHydro to calculate the different whatersheds of a given territory. It is not only important to know the different steps to achieve the desired result, but also the assumptions we will be using.…

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ArcHydro: how to model the water resources of a territory: 1-Install

ArcHydro Presentation ArcHydro is a set of data models and tools that work under ARCGis to support the data analysis of superficial water resources. You can use ArcHydro to delineate and characterize the watershed lines, define…

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Recent articles

  • Exporting a QGIS layout to SVG: uses, limitations, and solutions
  • Associating points with their municipality or zone: simple spatial joins with MMQGIS
  • Geocoding place names and finding an address from GPS coordinates with QGIS + MMQGIS
  • Work or train independently: create a portable QGIS environment
  • Building a consistent, reusable QGIS environment: bookmarks, project templates and automation

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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