Convert a points layer to a polygons layer in QGIS without using plugins

In QGIS it’s possible to convert a points layer to a polygons layer in just a few steps. To do so there are some minimum requirements for the points layer, because QGIS has to know which points should be grouped to a polygon and in which order these points must form a polygon. To illustrate this I have created a test layer with 7 points. I added two new fields: “polygon” and “order”. The field “polygon” indicates which points have to form a polygon together. In this example the result should be two polygons (1 & 2). The field “order” indicates in which order the points should be connected to form a polygon. In this example the result will be a triangle and a quadrangle (quadrilateral).

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How to autonumber a field in QGIS

To autonumber a field to give it a unique number, is something very common in databases like for example PostgreSQL with a Serial field type. But for other kinds of data sources this too can be very handy. Below I give an example of how you can do this in QGIS. It is a way to autonumber in QGIS that can be used for all kinds of vector data sources, so it’s also usable for for example shapefiles.

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Plugin Load Times v3.0 for QGIS released

If QGIS takes long to start, it is probably because some of the plugins you installed take a long time to load at startup. Plugin Load Times shows the latest load time of each QGIS plugin (QGIS startup, plugin installation,…). It does not give you information about the speed of plugins when they are used. With the information provided by this plugin you can easily decide which plugins to disable, to make QGIS start faster.

A couple of weeks ago I released version 3.0 of Plugin Load Times. Since QGIS 3.4 is the new LTR version, this version of the plugin will only be available for QGIS 3.x.

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Building Footprint Posters based on a 3D map

After I posted a link to a previous article about making Building Footprint Posters in QGIS on LinkedIn , I got a question about how to make these kind of Building Footprint Posters based on building heights. In Flanders we’re lucky enough to not have to create this kind of data ourselfs based on DTM and DSM map layers. The Agentschap Informatie Vlaanderen distributes the 3D GRB (a 3D base map of Flanders), that has that information per building.

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