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Using ArcGIS Server Web Map Services in Web Map Mash-Ups

Using ArcGIS Server Web Map Services in Web Map Mash-Ups. Benjamin Spaulding, Ph.D. AIR Worldwide Esri Boston Dev Meet-Up 12/8/2010. What is a WMS?.

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Using ArcGIS Server Web Map Services in Web Map Mash-Ups

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  1. Using ArcGIS Server Web Map Services in Web Map Mash-Ups Benjamin Spaulding, Ph.D. AIR Worldwide EsriBoston Dev Meet-Up 12/8/2010

  2. What is a WMS? • “The OpenGIS® Web Map Service Interface Standard (WMS) provides a simple HTTP interface for requesting geo-registered map images from one or more distributed geospatial databases.” • A WMS request defines the geographic layer(s) and area of interest to be processed. • From http://www.opengeospatial.org/standards/wms • Simple definition - Provides a link to a geospatial image

  3. Integrating ArcGIS Server WMS • Creating Data • Simply generate a map in ArcMap with data stored in ArcServer • Publish the map to ArcServer and make sure to select WMS under the Capabilities tab • Accessing from a Web Platform • Will need access to a WMS URL • Need an API to integrate with online mapping tools • Tons of online examples, easy to program

  4. Understanding the WMS URL • How to decode a WMS URL • Request – GetMap • Layer– What is the layer’s name? • In ArcGIS Server the layer name is a number from 0 to n. Check metadata for details • Style – Is there a defined style for the layer? • Format – Do you want to display a JPEG or a PNG? • Bounding Box – How do you pass those values to the URL? • Projection – ESPG:4326 or others • Width and Height of tile – 256 x 256 or other size? • Version – 1.1.1 or 1.3? • Complete WMS URL Request: http://rsarcserver1/ArcGIS/services/topos_wms/MapServer/WMSServer?request=GetMap&transparent=true&format=image%2Fjpeg&bgcolor=ffffff&version=1.1.1&layers=0&styles=default&exceptions=application%2Fvnd.ogc.se_xml&bbox=-71.148%2C42.2595%2C-71.003%2C42.4045&srs=EPSG%3A4326&width=700&height=700

  5. ArcGIS Server in Google Maps V3 • WMS layer added as a ImageMapType • When creating the function that reads the WMS URL the developer can define a number of properties • Bounding box values passed using Google’s code • Developer can take advantage of Google’s built in tools, like using the address search, or adding KML overlays

  6. ArcGIS Server WMS in Esri JavaScript • WMS layer added as an URL • When creating the function that reads the WMS URL the developer can define a number of properties • Developers can take advantage of built in tools, including WMS legends and other Esri tools

  7. Catches… • Need to understand your version • Differences between 1.1.1 and 1.3 • Bounding box values, axis order based on CRS • SRS (projection) vs. CRS (coordinate system) • Projections • What is the goal of the map? • ESPG:4326, most compatible, other projections are available, but more code is required • Image Format • Remember, there are differences between PNG and JPEG rendering • When using Google Maps you will need to sign up for an API

  8. Quick Example

  9. Summary • WMS is a great tool for displaying a variety of datasets in a number of web applications • Can create your own base maps and take advantage of other tools available in the appropriate JavaScript library • Can rapidly create WMS layers in ArcMap and ArcGIS Server so others (developers) can easily consume data in web applications

  10. For More Information • Main example • www.gisdoctor.com/v3_wms.html • Another great example • http://maps.massgis.state.ma.us/mhc/examples/gmap3wms_example2.html • Integrating Esri platform into Google Maps • http://help.arcgis.com/EN/webapi/javascript/gmaps/index.html • WMS in Esri JavaScript v2.1 • http://help.arcgis.com/EN/webapi/javascript/arcgis/help/jssamples_start.htm

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