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This tutorial is now obsolete. A new and updated version is available at Searching and Downloading OpenStreetMap Data (QGIS3)
Getting high quality data is essential for any GIS task. One great resource forfree and openly licensed data is OpenStreetMap(OSM) . The OSM database consits of streets, localdata as well as building polygons. Getting access to OSM data in a GIS formatis integrated in QGIS. This tutorial explains the process for searching,downloading and using OSM data in QGIS.
OSM Bright is a starting point for quickly making street-level maps in TileMill based on an OpenStreetMap database. Drive file stream download for mac. This guide aims get you quickly set up with this template and rendering a exporting a customized version of it in under 30 minutes. Step 0: Download & install required software.
Overview of the task¶
Search for London in OSM database, browse and select a part of the city, andextract all pub locations as a shapefile.
Procedure¶
- We will use 2 plugins to accomplish the task. Make sure you have installedOSM Place Search and OpenLayers plugins. See Using Plugins forinstructions on downloading plugins.
- The OSM Place Search plugin will install itself as a Panel in QGIS.You will see a new panel titled OSM place search.. in QGIS.
- The OpenLayers plugin is installed under the Plugin menu. This pluginallows you to access basemaps from various providers in QGIS. Let’s load theOpenStreetMap basemap in QGIS by going to Plugins ‣OpenLayers plugin ‣ Add OpenStreetMap layer.
- You will see a world map loaded in QGIS.
Note
If you do not see any data - make sure you are online - as the basemap tilesare fetched from the internet. You can also use the Pan tool to move themap canvas slightly, which will trigger a refresh of the basemap.
- Now, let’s search for London. Type the query in the Namecontains.. box in the OSM Place Search panel. You can hover over theresults and the appropriate place will be highlighted on the map. Select thefirst result - which the city of London in UK - and click theZoom button.
- You will see the base layer move and center around the city of London. Youcan use the Zoom tool to zoom and select the exact area of yourinterest. For this tutorial, you can zoom in the center of the city asshown.
- Now we can download the data displayed on the map canvas. Go toVector ‣ OpenStreetMap ‣ Downlod data.
- In the Download OpenStreetMap data dialog, chooseFrom map canvas as the Extent. Choose the path andname the output file as
london.osm
.
- The downloaded file with the
.osm
extension is an text file in the OSMXML format. We first need toconvert it into a suitable format that is easy to consume in QGIS. Go toVector ‣ OpenStreetMap ‣ Import topology from XML.
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Now that we do not need the OSM Place Search functionality, you canclick the close button to remove it from the main window. If you need to useit again, you can enable it from View ‣ Panels ‣ OSMplace search.. (Windows) or Settings ‣ Panels ‣ OSM place search.. (Linux).
- Choose the downloaded
london.osm
as the Input XML file.Name the Output SpatiaLite DB file aslondon.osm.db
. Makesure the Create connection (SpatiaLite) after import button ischecked.
- Now the last step. We need to create SpatialLite geometry layers that canbe viewed and analyzed in QGIS. This is done using Vector‣ OpenStreetMap ‣ Export topology to SpatialLite.
- The
london.osm.db
file contains all feature types in the OSM database -Points, Lines and Polygons. GIS layers typically contain only one type offeature, so you need to choose one. Since we are interested in pointlocations of pubs, here you need to choose Point (nodes) as theExport type. You would choose Polylines (open ways)if you wanted to get the road network. Name the Output layername aslondon_points
. GIS data has 2 parts to it - location andattributes. We are also interested in the name of the pub - not justits location, so we need to export that information as well. Click onLoad from DB under Exported tags section. This willfetch all attributes from thelondon.osm.db
file. Checkname and amenity tags. See OSM Tags to learn more about whateach attribute means. Make sure the Load into canvas whenfinished is checked, and click OK.
- You will see a new point layer named
london_points
loaded in QGIS. Notethat this contains ALL points in the OSM database for the viewport.Since we are interested only in pubs, we need to write a query to selectonly those. Right click onlondon_points
layer and selectOpen Attribute Table.
- You will note that some features have the attribute value of pubslisted under the amenity column. Click on Selectfeatures using an expression button.
- Enter the expression “amenity” = ‘pub’ and click Select.
- Back in the QGIS Canvas, you will see some points highlighted in yellow.These are the result of our query. Right-click the
london_points
layerand choose Save Selection As...
- In the Save vector layer as.. dialog, enter the name of theoutput file as
london_pubs.shp
. Leave all other options as they are andmake sure the Add saved file to map option is checked. ClickOK.
Creating Your Own Map On Openstreetmap
- You will see a new layer named
london_pubs
in the QGIS canvas. Uncheckthelondon_points
layer as we don’t need that anymore.
Openstreetmap Data Download
- The extraction of the pubs shapefile layer is now complete. You can use theIdentify tool to click on any of the point as see itsattributes.