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Author: Atilio Francois

18 June 202511 June 2025 Atilio Francois No Comments
  • QGis

QGIS: A New “SQL Query” Option in the Layer Context Menu

Starting with QGIS version 3.42, a subtle but powerful feature has been added to the context menu of vector layers: the “SQL Query…” option. This improvement provides a direct and user-friendly interface for running SQL queries,…

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6 June 20254 June 2025 Atilio Francois No Comments
  • QGis

QGis and geoparquet

History of Parquet and GeoParquet 1. Apache Parquet – The original format History: Objective: GeoParquet – Geospatial extension of Parquet History : Year Event 2021 (April) First exchanges on GitHub and in open source communities to…

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4 June 20254 June 2025 Atilio Francois No Comments
  • Postgis
  • PostgreSQL

ENC maps in QGis with Postgis(1)

This subject comprises two articles. The first deals with importing ENC S57 files into a Postgresql/postgis database. The second deals with setting up an automatic symbology equivalent to nautical charts. You can download all the scripts…

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28 May 202528 May 2025 Atilio Francois No Comments
  • PostgreSQL

Postgis:table with multiple geometries

List partitioning in PostgreSQL/PostGIS is a declarative partitioning method that divides a large table into several sub-tables, according to the discrete values of a column (e.g. by region, type, year, etc.). This is particularly useful in…

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23 May 202519 May 2025 Atilio Francois No Comments
  • webmapping

Leaflet: responsive

At the end of the Leaflet introductory course, the final mini-project looked like the following map: With a map displaying geojson data, a mini-map and a title. This screenshot was taken on a PC and looks…

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21 May 202519 May 2025 Atilio Francois No Comments
  • webmapping

MBtiles & Leaflet

Introduction: What is the MBTiles format? The MBTiles format is a file format for storing map tiles (raster or vector) in a SQLite database, a lightweight, stand-alone database engine. Initially designed by Mapbox, this format has…

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Recent articles

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Recent comments

  1. 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…

  2. 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.

  3. Atilio Francois on Portable version of QGis 3.32.07 May 2025

    Hello The problem with the portable version is that it's very dependent on the particular configuration of the machine. The…

  4. NotFred on Portable version of QGis 3.32.07 May 2025

    I have never had QGIS installed in my machine (it's a brand new laptop) and I get the same error,…

  5. Atilio Francois on Portable version of QGis 3.32.028 April 2025

    The file is present in the download ...\QGIS 3.32.0\QGIS 3.32.0\apps\qgis\bin The error message probably comes from a previous installation of…

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