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Web Mapping with Open Standards and Software

Web Mapping with Open Standards and Software. Building a WMS Crime Viewer with OpenLayers January 8, 2009 Douglas Sheldon GIS Applications & Database Administrator Spotsylvania County, Virginia Advised by Ian Turton, PhD. Introduction. Open Standards and Software

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Web Mapping with Open Standards and Software

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  1. Web Mapping withOpen Standards and Software Building a WMS Crime Viewer with OpenLayers January 8, 2009 Douglas Sheldon GIS Applications & Database Administrator Spotsylvania County, Virginia Advised by Ian Turton, PhD

  2. Introduction • Open Standards and Software • Open Geospatial Consortium (OGC) Standards • Map Server Software • Map Client Software • Implementation

  3. Open Standards • Open to all interested participants • Equal membership • Cooperation between members • Independent of proprietary solutions • Free distribution and implementation of specifications

  4. Open Software • Includes source code • Permits modification • Free to redistribute

  5. OGC Standards • Web Map Service (WMS) • Web Feature Service (WFS) • Web Coverage Service (WCS) • Geographic Markup Language (GML) • Styled Layer Descriptor (SLD)

  6. OGC Standards: WMS • Requests • GetCapabilities • Returns capabilities as XML • GetMap • Returns map as an image • GetFeatureInfo (optional) • Returns attributes as XML • Versions • Version 1.1.1 or 1.3

  7. OGC Standards: WMS • GetCapabilities Request http://arcims.spotsylvania.va.us/ ArcGIS/services/crime/MapServer/WMSServer? request=getcapabilities&version=1.1.1

  8. OGC Standards: WMS • GetCapabilities Response

  9. OGC: WMS GetMap • GetMap Request http://arcims.spotsylvania.va.us/ ArcGIS/services/crime/MapServer/WMSServer? request=getmap&version=1.1.1&layers=0,1& styles=&SRS=EPSG:4326&bbox=-77.9,38.0,-77.35,38.38& width=400&height=300&format=image/png

  10. OGC Standards: WMS • GetMap Response

  11. Map Server Software • Deegree • GeoServer • MapServer • ArcGIS Server

  12. Map Client Software • Web Browser • Mozilla/FireFox • Internet Explorer • JavaScript Client Library • OpenLayers • MapBuilder

  13. Implementation • Data (Shapefiles) • Map Server (ArcGIS Server 9.2) • Create Map Service (WMS) • Web Server (Apache, IIS) • Install Client Library (OpenLayers 2.7) • Build Web Map • HTML/JavaScript (OpenLayers API)

  14. Test Web Map Service (WMS) • Find your WMS URL in your map server management tool • Try a WMS GetCapabilities request in a web browser • Proves the map service is running • Verifies the URL of your WMS For example: http://arcims.spotsylvania.va.us/ ArcGIS/services/crime/MapServer/WMSServer? request=getcapabilities&version=1.1.1

  15. Install OpenLayers • Copy OpenLayers.js and the img and theme folders to a folder under the root directory of your web server

  16. Test OpenLayers • Copy wms.html from the examples folder to the root directory of your web server • Change the text reading “../lib/OpenLayers.js” to the relative path to your OpenLayers.js file, for example:“openlayers/OpenLayers.js” • Change the text reading “http://labs.metacarta.com/wms/vmap0”to the URL of your WMS, for example:“http://arcims.spotsylvania.va.us/ArcGIS/services/MapServer/WMSServer” • Change the text reading “layers: ‘basic’” to the name of one of your WMS layers (“layers: ‘<your_layer_name>’”) • Open wms.html in a web browser to verify everything works

  17. Build Web Map • Style and Label Layers • Crime Incidents • Roads • Subdivisions • County Boundary • Turn Map Layers On/Off • Map Navigation (Pan/Zoom) • Find/Query Roads and Subdivisions • Map Legend

  18. Conclusion • Open Standards and Software • Open Geospatial Consortium (OGC) Standards • Map Server Software • Map Client Software • Implementation

  19. Web Mapping withOpen Standards and Software Building a WMS Crime Viewer with OpenLayers January 8, 2009 Douglas Sheldon GIS Applications & Database Administrator Spotsylvania County, Virginia Advised by Ian Turton, PhD

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