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Tag: qgis

1 May 20232 May 2023 Atilio Francois No Comments
  • QGis

How to find the coordinate system of a layer with QGis 3.X?

When working with spatial data in GIS software, you regularly encounter the problem of files that lack a clearly defined coordinate system. When a file lacks its coordinate system (CSR), it can lead to misaligned layers,…

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  • Non classé

How to install Python add- ons for ArcGis and QGis

For those who are not familiar with the oddities related to the use of Python add- ons , the almost unavoidable pitfall   installation of the module. You will find yourself with a .tar.gz file and…

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  • english posts
  • GIS and management
  • QGis

Python Methods for QGis: how to examine vector data

Once a layer is loaded, usually we want to access the data included in the layer, whether the geometries or the attributes. Now, we will discuss how to code in Python the access to these two…

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  • english posts
  • PostgreSQL

Spatial analysis with SQL: 5- aggregation function (ArcGis Union)

In Article previous we have discussed some SQL functions for spatial processing . In this article we will see a function a little more complicated to put at work: the aggregation function for two layers of…

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  • english posts

1-n joins in QGis: virtual layers

One of the most common techniques in GIS in order to treat non-spatial data is that of the join. We use a geographical layer having geometries, as support for another layer having no location data. To…

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  • QGis

QField: the mobile device of QGis for Android

QField allows you to do fieldwork on QGis projects with Android phones or tablets. In this article we will discuss how to install QField on a mobile device and how to install and work on a…

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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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