BEGEODE ULTIEME CONNECTIE / LA CONNEXION À L'ÉTAT PUR

www.osgeo.org

Open source tools for building a GIS

Empower everyone with open source geospatial

About Me● Freelance Data Scientist /GIS

– Mostly using open source

● Fluves– Monitoring solutions based on Fiber optic technologies

● OSGeo Belgium– Co-founder & president

OSGeo Belgium

Overview● Intro● What is Open Source● Open Source Tools for Building a GIS

– Core libraries– Desktop: QGIS 3– Database: PostGIS– Analytics (SAGA, R, Python)– Open Services & WebGIS

● OSGeo Live● Why Open Source GIS?● The community

What is Open Source● Source code available with the program● License to reuse that sourcecode

● Commercial vs proprietary

● There are different licenses

https://opensource.org/

Open Source Tools● Core libraries● Desktop GIS● Web Services and Web GIS

Core libraries● Core libraries used by ALL other GIS packages

– GDAL (data abstraction layer)● Version 2.3 almost released● 154 raster formats● 93 vector formats● Added support for cloud services (aws, azure, google, alibaba, ...)

– Proj (projection systems)● Version 5 recently released● 140 projections● 43 ellipsoids● 20 datums

– PDAL (point clouds)–

●

QGIS● Desktop GIS

– Visualize, manage, edit and Analyze data

– Compose maps – print maps

– Analytical functions

This is QGis

Intermezzo – Some datasets● Villo bicycles from Brussels● Statistical zones

– https://statbel.fgov.be/nl/open-data/statistische-sectoren

● Population/... per zone● Background WMS layer

– Urbis–

QGIS● Vector data (points)● Vector data (polygons)● Background layer: WMS● Raster: distance to bike stand

Advanced Analysis● A number of packages exist which allow

advanced analyses– SAGA

● http://www.saga-gis.org/

– GRASS– Python (fiona, rasterio, geopandas)

● http://2018.geopython.net/

– R● http://www.rspatial.org/

● Much of their functionality available through ‘processing’ in QGis

Geopackage● OGC standard● Small local database

– Features● The new shapefile?

– Tiled Rasters– Non Geo tables

http://switchfromshapefile.org/

PostGIS● Spatially enabled database● Database

– Provide random access to standard types, indexes

● Spatial Database– Provide access/specific functions for Geospatial/geographic types– Spatial indexing key for good performance

● Carto– Cloud version of PostGIS

PostGISGIS enabled database

Select Sum(customers.spending) from customers JOIN communes on ST_Contains(communes.geom, customers.geom);

Select ST_ASGeoJSON(geom),aantal from veiligheidwijken join politiezones on veiligheidwijken.wijknr =politiezones.wijknr and crimineelfiguur='autodiefstal‘

PostGIS● Recent versions (9.6 +) and PostGIS 2.3+● Parallel processing● Pointcloud support● Fdw = foreign data wrapper – access most datasets(also

files/oracle/...)●

Geospatial services & WEB● Open Geospatial Consortium (OGC)

– Find data● Catalog Service for Web (CSW)

– Maps/Imagery● Web Map Services (WMS/WMTS)

– Features/Raster data● Web Feature Services (WFS) / Web Coverage Service (WCS)

– Processing● Web Processing Service

● IETF– Vector data in JSON: geoJSON

Find data - CSW● Geonetwork – GeoNode (pyCSW)

Serve Maps / Data● QGis server - Geoserver

Show your data on the web● Leaflet & OpenLayers

OSGeo Live● Documentation + software

OSGeo Live● Short Description● Quickstart

● For 60 applications

● https://live.osgeo.org

Join the community● Upcoming activities● Python geodev night● FOSS4G Europe – 16-21/7/2018

– https://foss4g-europe.osgeopt.pt/

● FOSS4G Belgium end of october– http://foss4g.be– Call for papers will open soon!

● FOSDEM 2/3/2019

Thank youFor your attention

DE ULTIEME CONNECTIE

LA CONNEXION À L'ÉTAT PUR

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johan@gisky.behttp://live.osgeo.orghttp://osgeo.be