Tag Archives: Tips1

This article explains the presentation of flows on a map, using the FlowMapper plugin. For this demonstration, data on commuting patterns between 40 regions are used (from Statistics Netherlands). Preparing the data After the plugin is installed in the usual way, the manual can be found in the folder C:\Users\{username}\.qgis2\python\plugins\FlowMapper2_documentation.Three text files are required, with node […]

Sometimes you need to produce a series of similar thematic maps. The only difference is the field used to colour areas or show graduated symbols. Classifications or maximal symbol sizes are identical. For large numbers of maps it is quite annoying to repeat the same actions in QGIS over and over again. Moreover, mistakes are […]

In a previous article I described how you can let QGIS generate a series of thematic maps with a batch file. This method was meant for the Windows version of QGIS. Now I have written a similar shell script for Linux (‘projectsnapshots’). You can find it in the ZIP file included with this article. It […]

Graduated symbols are the best way to visualize absolute numbers like population size. Usually the area of the symbols is made proportional with the number to be displayed. This is especially important if the values are far apart. Methods QGIS 1.8 offers four methods to display graduated symbols. All can be found in the dialogue […]

If you want to influence the locations where labels, symbols or diagrams are displayed within areas, it is useful to have a separate layer with centroids. This article demonstrates how such a map layer can be created and modified in QGIS. The Dutch provinces are used as an example. This is a revised version of […]

[For a modified version, go to this article.] Sometimes you need to produce a series of similar thematic maps. The only difference is the field used to colour areas or show graduated symbols. Classifications or maximal symbol sizes are identical. For large numbers of maps it is quite annoying to repeat the same actions in […]

In response to my previous article about joining data from a csv file, I received a very good tip. From QGIS 1.8 Excel files can be opened directly in QGIS. Strange enough, nothing is mentioned about this in the ‘release notes’. It only works with the older XLS-format, not with the newer XLSX format. You […]

In a previous article I have shown how data from a text file with points can be displayed as an additional layer on top of a layer consisting of areas. There was no connection between de data from both layers. This article explains how areas in one layer can be coloured based on data from […]

This article describes how to create a map with bar charts and a legend. Required software Quantum GIS (qgis.org) LegendSVG (qgis.nl) Inkscape (optional) (inkscape.org) Required files Map layer with areas Map layer with data As an example, a vector map of the Dutch provinces is used. On top of this a layer is placed from […]