Optimized publishing of map and dataservices

with GeoServer, GeoStyler and MapProxy


Till Adams, Marc Jansen, terrestris GmbH & Co. KG

FOSS4G 2021, Buenos Aires 2021-09-30, 08:30–09:00, Buenos Aires

Agenda - Which road do we take?

  • About …
    • … the authors and presenters
    • … this talk
  • Components
  • Optimization
    • Style
    • Performance
  • Summary & Example

About ... the authors and presenters

Till Adams
  • Shareholder terrestris
  • Chair of global FOSS4G 2016 in Bonn
  • OSGeo Board member
  • Consultant & agile Coach

Marc Jansen





@marcjansen


  • General Manager terrestris & mundialis
  • OSGeo charter member
  • PSC / Core developer of
    • OpenLayers & GeoExt
    • Contributor to GeoStyler, react-geo & other
  • ...Developer / technical background

terrestris



@terrestris
  • www.terrestris.de
  • OpenSource GIS service provider, located in Bonn, Germany
  • Planning, Development & Projects
  • Consulting, Support & Trainees
  • providing popular free OSM-WMS (worldwide)

... about this talk

Why this talk?

Why this talk?

This talk is for users, not so much for developers
  • Thank god: Creation of a simple WMS with Open Source tools is easy today, but ... 🙏
    • Styling is still a Topic
    • Performance is always a Topic
  • Setting up and well designed and fast WMS services arestill a Topic

Is this the one and only solution?

No! Of course not!
  • There are many FOSS ways of achieving similar results
  • This talk wants to share our experience and provide an insight into how we often solve problems
http://densiaamelia.blogspot.com/2014/01/there-are-many-ways-to-go-to-rome-there.html

Scan the title for buzzw … components

Optimized publishing of map and dataservices with

GeoServer

  • Java-based, OGC compliant Server for Geodata
  • Well documented and powerful API
  • Widely used in GIS world
  • Integrated in many WebGIS frameworks (e.g. SHOGun)

geoserver.org
geoserver

GeoServer

Input Files
  • Vector files (e.g. Shape)
  • RasterData (e.g. GeoTIFF)
  • DataBase (e.g. PostGIS)
  • Other Servers (e.g. WMS, WFS)

GeoServer

Output Services
  • WebMapService (WMS)
    • Styling: StyledLayerDescriptor (SLD) and others
  • WebFeature Service (WFS)
  • WebCoverageService (WCS)
  • WebProcessingService (WPS)
Optimized publishing of map and dataservices :

Okay, you‘re done

GeoServer – Styling Maps

  • WebMapService (WMS)
    • Styling: StyledLayerDescriptor (SLD) et al.

GeoStyler

  • Ready-to-use map styling library
  • Read & write of various style formats
  • Read of various data formats
  • Development & integration of own parsers
  • Support for raster data
  • => Later today dedicated talk by J. Suleiman

geostyler.org
geostyler

GeoStyler

Input Features
  • Filters & Classifications
  • Scale Ranges
  • Calculation of overlaps
  • StandAlone (UI) / Integrated

GeoStyler

Read/Write formats
  • Styled Layer Descriptor (SLD)
  • QGIS Style
  • OpenLayers Style
  • MapBox Style
  • Mapserver Mapfiles (=> talk by B. Teuscher)
  • … others planned

GeoStyler

User Interface Elements (UI)

GeoStyler

Standalone

GeoStyler

GeoServer Plug In
Optimized publishing of map and dataservices :

But now, you‘re done

Caching Maps

Clever if ...
  • Data doesn‘t change too often
  • Many requests expected
  • Many layers (e.g. grouped layers
  • Performance problems
  • Restricted hardware capabilities of (WMS) Server

GeoWebCache

it's integrated in GeoServer
  • Java-based tiling server (caching application)
    • Sources: WMS
    • Interfaces: WMS-C, WMTS, TMS, Google Maps KML, Virtual Earth
  • Well documented and powerful API
  • Integrated in GeoServer

geowebcache.org
geowebache

MapProxy

Standalone
  • Proxy for geospatial data (Caching engine)
    • Sources: WMS, WMTS, Mapserver, Mapnik, Tilecache GoogleMaps, BingMaps, ArcGIS REST
    • Interfaces: WMS-C, TMS, WMTS, KML SuperOverlays
  • Well documented and powerful API

mapproxy.org
mapproxy

MapProxy


MapProxy

cool functions of MapProxy
  • MapProxy is capable to
    • Auto-generate grey version of cache
    • Re-project tiles (= one cache for several EPSG‘s)
    • Interpolate tiles between cached zoom levels
    • Read a lot of input data
    • Optimized storage
    • Security for layers or regions

GeoWebCache - Mapproxy

the attempt of a comparison I
  • GeoWebCache is built-in GeoServer & Standalone

  • GeoWebCache: one cache per EPSG-code – MapProxy: same cache for all, if wanted

GeoWebCache - Mapproxy

the attempt of a comparison II
  • MapProxy is able to replace the service behind by cache-interpolation
    • MapProxy interpolates tiles if request is between zoom levels
    • GeoWebCache sends request to GeoServer

  • Oversimplified: GeoWebCache WMS needs parameter “tiled=true“ on WMS-request

One example

Free to use world-wide OSM WMS: ows.terrestris.de

Architecture

Optimized publishing of map and dataservices
Optimized publishing of map and dataservices :

And now, you‘re done!

Summary

It's cool, it's open!
  • Open Source is combinable!
  • There is often more than one component to reach your goal
  • The presented architecture has already proven its suitability for setting up good-looking, fast and robust MapServices, as the example OpenStreetMap WMS shows

Imprint

Authors

T. Adams & M. Jansen
terrestris GmbH & Co. KG
Kölnstraße 99, 53111 Bonn
Germany
adams@terrestris.de & jansen@terrestris.de

License

Slides are published under CC BY-SA license.
terrestris.github.io/foss4g2021/geostyler
PDF-Version, git repository