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Author: Atilio Francois

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Spatial Analysis with SQL: 3-Spatial Relationship Functions

Following the two introductory articles, The spatial analysis with SQL: 1-Introduction , 2-the preconceived misconceptions , we will discuss the ten Postgis spatial relational functions (that you will also find when using Spatialite). As previously stated,…

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Spatial analysis with SQL: 2 -the preconceived misconceptions

In a previous article we have stated ( The analysis space with SQL: 1-Introduction ) that the most common idea is that SQL is a very good query tool on GIS tables but you must have…

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Spatial Analysis with SQL: 1-Introduction

I propose you a series of articles to address some ideas received on the use of the SQL language and its possibilities in the spatial analysis. To summarize the most widespread idea, the SQL language is…

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Dimension Explorer in ArcGis 10.3: From Time Cursor to Multidimensional Cursor

With ArcGis we have a powerful tool to visualize the temporal evolution of the layers: the temporal cursor. With the Addin Dimension Explorer 1.1 these possibilities are extended to any dimensional variable. If, for example, you…

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New ArcMap tools: searching for duplicates

Since the release of version 10.3 a new tool that allows the search for duplicates in a layer: look for duplicates has been made available. The tool Remove the identical element allows deleting the duplicates of…

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QGis 2.8 graphic modeller: Python script Iteration, nesting and export

The execution of model algorithms by iteration In the previous chapter we have executed our model that selects and cuts those plots located within 500 meters of our oyster facilities. The result is a single layer…

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  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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