3Liz

• Open Source forever, check our GitHub
• Contributors in QGIS, server side mainly, plugins
• QGIS Desktop QGIS Server PostGIS
• Opensource solution for publishing QGIS Project on the web,
  Lizmap Web Client

OSM data model

• Different primitive objects

• A OSM way can either be a GIS line or GIS polygon according to its OSM tags (key/values)
• A OSM relation can be point, line, multilinestrings, multipolygons, mixed geometry…

OSM data model

Another difference attributes

• In GIS, the layer has one or many fields, defining all features in this specific layer

• In OSM, the layer does not exist. Each feature is individual and has its own fields.

Do you need …

• to have up to date OSM data ?
• to work with small extent or a big extent ?
  • By the way, what is a small and big extent ? (for online API)
  • Density of data in different part of the worlds
• to have OSM metadata such as contributor, changeset, timestamp ?
• data designed for display or analysis or routing or geocoding or … ?
• all OSM keys and values or just the "most common ones" ?

With QGIS only

• Add the default mapnik style as a raster, from the QGIS Browser

With QGIS only

• Some online tools are already transforming the data into GIS formats (SHP, Geopackage…)
• https://download.geofabrik.de/
• https://www.data.data-wax.com/ France and other countries, QGIS style, GitHub ( this screenshot)
• Opendata portals (such as the French one https://www.data.gouv.fr). Look in your country
• …

With QGIS only

• Load OSM XML or PBF files
  • Thanks to OGR in the background
• Different websites to download these files with worldwide coverage:
  • https://download.geofabrik.de/
  • http://download.openstreetmap.fr/extracts/
  • …

With QGIS only

• It starts to be an issue if you want some specific fields
• This is called an HStore field

Use Processing Explode HStore

Or use QGIS Expression

for selection, labelling ...

Using QGIS Plugins

A few plugins in the QGIS plugin manager among the 914 plugins available (August 2022)

QuickMapServices plugin

OpenTopoMap in the background, based on OSM, designed for hiking

QuickMapServices plugin

In QuickMapServices, go in Settings More services Get contributed pack to enable a lot of basemaps .

QuickOSM plugin

• Download the data on the fly
• Making requests to the Overpass API, similar to Overpass-Turbo
  • Server API to retrieve raw OSM data based on queries (OQL)
• QuickOSM 2.2.1 was released this weekend, during the SOTM & QGIS Contributor meeting
• Targeting both
  • non OSM contributors
  • and OSM OverpassAPI experts
• It's removing the HStore field other_tags by exploding it
• As it's using an API, limited amount of data
• Let's make an overview of this new version

Quick Query

• Search in your native language
  • Bakery
  • Panetteria
  • Boulangerie
  • shop=bakery in OSM
• Multi key/value support with AND/OR operator

• Thanks to the JOSM and Vespucci community to share these presets on GitHub

Quick Query

French people love and

Map presets

• Download many layers, many OSM objects, with a QGIS symbology at the same time with 2 clicks

Map presets

A few steps to make new presets, with a QGIS style

QuickOSM in Processing

• Available in Processing Toolbox and Modeler
• Batch processing
• Example : downloading fire hydrants, reprojecting in meters projection, buffering and QGIS Style

QuickOSM in Processing

Local OSM file

• Having a PBF/OSM file on your computer ?
• You can still filter it

OSM relations

Issues with OSM relations

• The underlying library (OGR) can only display relations = route, multilinestrings, multipolygons or boundary.
• Other relations need some post-processing to manage geometries for a GIS software

Geocoding

• New in QGIS 3.20
• No more plugin required
• https://nominatim.qgis.org
• Processing algorithm for batch geocoding
  

Geocoding

• New in QGIS 3.20
• No more plugin required
• https://nominatim.qgis.org
• Integrated in the locator bar (without plugin)

Routing

• ORS Tools
• API based on OpenStreetMap data
• isochrones and matrix calculations

Importing OSM in a database ?

https://wiki.openstreetmap.org/wiki/Databases_and_data_access_APIs#Database_Schemas

• Mainly osm2pgsql, used for rendering, very old project and used
• Imposm, version 3 is updatable. Each layer has a mapping configuration

Database with docker

• and
• https://github.com/kartoza/docker-osm
• Docker-compose project :
  • PostgreSQL container
  • Imposm container
  • OSMUpdate container : to download OSM diff files
• Workflow
  • Drop a PBF file in the folder
  • Drop the area of interest for clipping (recommended) in the folder
  • Copy .example.env to .env for local settings
  • make run

et voila !

Possible to customize the configuration :

• Different mapping
• Generalization for different scales
• Updated every two minutes by default
• SQL Triggers, views
• Styles included in the QGIS layer_styles table

Vector tiles

• Vector tile support, new in QGIS 3.14
• MapTiler / OpenMapTiles https://openmaptiles.org/
• Talk at the State Of The Map by Jiri Komarek and Wladimir Szczerban
• Talk at the FOSS4G by Adam Laza yesterday, QGIS MapTiler plugin