Open source technologies and INSPIRE network services in Slovak environmental agency

Transcription

1 Open source technologies and INSPIRE network services in Slovak environmental agency Peter Mozolík, Martin Koška, Marek Žiačik, Martin Tuchyňa Slovak Environmental Agency (SEA)

2 SEA role within slovak SDI Data producer landcover data, environmental loads, waste dumps... IT services provider serving organisation in public environmental resort infrastructure (networking) data services (database servers) web application hosting (web servers) GIS services (map servers) INSPIRE implementation coordinator IT expertise and consulting provider information system design and analysis

3 SEA GIS related technology background Established technology lines Proprietary software ESRI technology (family of products) built for long time (production) Open source & free software solution various projects and products used in combination raised from need to cut expenses

4 Free & open source software Software licensed under conditions ensuring user right to use, copy, study, change through availability of source code Think of free as in free speech, not as in free beer Things to check: maturity of project release cycle documentation community

5 Open source components

6 Spatial data storage services SEA operates central environmental datawarehouse (including spatial data) for several organisations in resort Most of vector and spatial data is served through proprietary well established database and middleware (Oracle + ArcSDE) Cheaper (from TCO perspective) yet very stable, performant and flexible DBMS PostgreSQL / PostGIS was deployed for: OpenStreetMap (OSM) data for Slovakia Data services solution for hydrography related organisations in public environmental resort (those unable to operate their own data services) New applications and projects preferably use PostgreSQL

7 PostgreSQL / PostGIS Long history (almost 20 years) Close SQL standards (SQL 2003) adherence Technical support great documentation wide community and several communication channels commercial support available almost everywhere Spatial data support through PostGIS extension (data types, functions, spatial index) Stability, reliability and reported from high volume environments OpenStreetMap project (one of largest publicly available spatial dataset(s)) uses PostgreSQL as core data storage solution and PostgreSQL/PostGIS as publishing database.

8 INSPIRE network services View service Geoserver WMS, Mapproxy WMS-C, WMTS, TMS Download service Geoserver WFS Discovery service conterra (proprietary), MiCKA (geoportal), PyCSW (testing)

9 Geoserver general info JAVA servlet application (in SEA deployed in Apache Tomcat) Built on Geotools JAVA GIS framework GNU GPL 2.0 license Core development provided by italian company GeoSolutions S.A.S OSGeo project

10 Geoserver general features Services supported: WMS, WFS, WCS & WPS (new) Web administration Wide spatial data format and source supported Vector: Shapefile, Java properties, GML, PostGIS, H2, ArcSDE, Oracle NG... Raster: GeoTIFF, ImageMosaic, ArcGRID, Oracle Georaster, Postgis raster REST configuration interface Highly granuled (recently overworked) security system, bit complex for novices Many official and community plugins and extensions Simple load balancing solution with respect of stateless nature of WMS and WFS services

11 Geoserver - WMS Supported WMS versions: 1.1.1, (default) SLD support, no SLD editor available Grouplayers support INSPIRE extension (GetCapabilities extension, supports scenario 1. in TG) Integrated GeoWebCache caching solution, we use different solution (see Mapproxy)

12 Geoserver - WFS Supported WFS versions: 1.1.0, (default) complex feature not supported out of box, supported through Application schema plugin GML versions supported: WFS > GML (default), GML WFS > GML (dafault) mapping file encodes mapping rules for generating complex features WFS responses must be crafted manualy, not UI is avalable for creating mapping file relatively complex partial FES 2.0 support stored queries support INSPIRE extension (GetCapabilities extension, supports scenario 1. in TG)

13 Geoserver - virtual services Support for multi tenancy through virtual servers, SEA uses this feature to provide services for some environmental resort organisations Workspace separation with security consequences Some features not working with virtual servers (stored queries)

14 Geoserver without virtual services

15 Geoserver with virtual services

16 Mapproxy general info Development backed by german company Omniscale GmBH & Co. KG Developed in Python (compatible with Python 2.6, 2.7) Released under free license Apache Software License 2.0 Running on Linux, Windows, Mac OS

17 Mapproxy - features Tiled service interfaces: TMS, WMS-C, WMTS Various sources: WMS, TMS/WMTS, Mapserver and Mapnik configurations reproject WMS sources to other SRS stores identical images just once (e.g. ocean tiles) embed watermark in tiles merge multiple sources limit sources to polygon areas (coverages) seeding (pregenerating tiles) relatively simple cascaded configuration in YAML format

18 Client side - desktop Most GIS people in SEA use proprietary desktop clients from ESRI. Some of them use also QGIS which is according to our experiences far most developed open source GIS desktop client on the scene

19 Client side web Development of GIS web applications in SEA is backed by: ESRI technology OpenLayers Javascript framework

20 Thank you