The QGIS OSMDownloader plugin lets you download OSM data while preserving the symbology.

To be able to do that, we first need to install the OSMDownloader plugin.

After the plugin is installed, we can go and activate and deactivate the OSMDownloader toolbar.

Next, with the Download OSM data by rectangle selection button (located in the OSMDownloader plugin toolbar), draw a rectangle over the area of interest to load downloaded *.osm files as QGIS layers.

The OSMDownloader dialog box appears. Specify a location on your computer to save the .osm file.

Click Ok. Depending on the size of the rectangle you drew, the download will take some time. When the download is complete, a Success, the file has been downloaded will pop up.

Now you can see the downloaded files in the Layers Panel as well.

Click Ok. Turn off/deactivate the OpenStreetMap basemap and zoom out slightly.

The OSM layers that are available within the drawn rectangle have now been downloaded to your computer. The OSM symbology is preserved in the layers.

By inspecting their symbology, we can manage the OSM symbology and perform various operations such as changes to the adopted styles, style export, and so on.

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Sources: 

Original post: Descarga de datos de OpenStreetMap (OSM) con simbología en QGIS – https://www.cursosgis.com/descarga-de-datos-de-openstreetmap-osm-con-simbologia-en-qgis/ 

OSMDownloader plugin – https://plugins.qgis.org/plugins/OSMDownloader/ 

The post How to download OSM data while preserving the symbology first appeared on GIS Course | TYC GIS Training.

Well, it is a thematic map (a map that illustrate the pattern of a particular variable/subject in a geographic area), in which the geographic areas are altered/twisted out of real shape, in a direct proportional way to the values associated with the variable.

A cartogram or anamorphic map focus therefore on size to efficiently differentiate the spatial distribution of the variable being mapped. The main advantage of these types of maps is that they offer a more intuitive cartographic design and data visualization.

In this tutorial we will find out how to create a cartogram or anamorphic map in QGIS.

Step 1: Open QGIS and install the cartogram3 plugin. This plugin creates continous cartograms (a.k.a. anamorphic maps) from polygon layers.

You can find more information about this pugin here: https://github.com/austromorph/cartogram3

The catrogram3 icon will be added in the QGIS Plugins toolbar.

Step 2: Before opening the cartogram3 plugin, make sure you load into QGIS map canvas a polygon dataset which holds a value for a the variable we want to map.

In this tutorial, to create a cartogram or anamorphic map we will use as mapping variable the population number of the African Continent countries.

Step 3: Start the cartogram3 plugin.

• Select the layer for which you want to compute the cartogram/anamorphic map.
• Select the Field where the population number is stored. In our case the pop_est.
• In the Stop Conditions select when the calculations will stop.

The cartogram/amanorphic map is computed. Now we can have a better perspective over the distribution of the population within the African continent.

In the before and after image below, you can have a better perspective on how the geographic areas (countries administrative units) were altered considering the population number in each country.

In the same time you can easily identify which are the largest countries in terms of population number.

SOURCE:

cartogram3 plugin – Author Christoph Fink – https://plugins.qgis.org/plugins/cartogram3/

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