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qgis

Offline hiking maps with QGIS 3 and Geopaparazzi

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In this post, I will show how to export background maps (as a set of MBTiles files) from QGIS 3 and import them in Geopaparazzi on Android to serve as backup offline hiking maps when far from civilization and mobile coverage.

It can be useful in France, where interesting maps to have while hiking are the IGN ones like Carte Topographique IGN (Scan 25) or their standard map (Scan Express Standard). They are accessible freely through the Geoportail mobile app. Unfortunately, the app doesn’t support offline mode.

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Freehand Raster Georeferencer plugin updated for QGIS 3

A few weeks ago, I updated my Freehand Raster Georeferencer plugin for the newly released QGIS 3. I also included a few fixes for some issues as well as new features such as uniform scaling, a new “Georeference with 2 Points” tool (contributed by a user) or taking into account an existing world file. Those changes were backported to the plugin version for QGIS 2 so there should not be any difference between the QGIS 2 and 3 versions. See the updated doc for information.

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"Freehand Raster Georefencer" plugin for QGIS

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Some time ago, I released a plugin for QGIS called “Freehand Raster Georeferencer” that allows interactive raster georeferencing. It implements some tools (move, rotate, scale, stretch…) to manipulate a raster directly on the map, on top of the other layers. This is in contrast with the standard raster georeferencing tool of QGIS, which needs control points and then an export to be able to check the georeferencing.

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Paris in 3D with QGIS and three.js

Some time ago, I saw this article about using the Qgis2threejs plugin to export a QGIS map as a 3D visualisation in the browser, thanks to three.js and WebGL. When I recently tried to follow the post to reproduce the results, I had some problem sourcing the data (related to Vienna, Austria) so instead I searched for data related to Paris to create a similar scene. Here is the result corresponding to the screenshot above and another one with aerial photos, both showing the Montmartre area of Paris.

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