Web GIS Oregon Explorer

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Web GISOregon Explorer
Marc G Rempel Oregon State University The Valley
Library Oregon Explorer marc.rempel_at_oregonstate.ed
u
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What is the Oregon Explorer?

• Natural Resources Digital Library
• Place-based resources
• Supports informed natural resource decision-making

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Evolution of the Oregon Explorer

• Basin Portals
• e.g. Willamette Basin Explorer
• Topic Portals
• e.g. Land Use Explorer
• Data Portals
• e.g. Imagery Explorer
• Oregon Spatial Data Library

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Components of Web GIS

• 1. Spatial Data
• 2. Web Server
• 3. Map/GIS Server
• 4. Mapping Application
• 5. Application Enhancements (optional)

MapServer example
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Components of Web GIS- Spatial Data
Examples of Spatial Data

• Shapefiles/ Geodatabases (ESRI)
• KML/KMZ (Google Earth)
• GeoRSS/GeoJson
• Web services
• WMS Web Mapping Services (image)
• WFS Web Feature Services (vector)
• WCS Web Coverage Services (raster)

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Components of Web GIS- Web Server
Examples of Web Servers

• Apache Tomcat
• IIS (Windows)

Web Servers provide the foundation for serving
out data on the web.
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Components of Web GIS- Map/GIS Servers
Examples of Mapping Servers

• ArcIMS
• ArcGIS Server
• GeoServer
• MapServer

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Components of Web GIS- Map/GIS Servers
Role of Map/GIS Servers

• Serve spatial data via the internet.
• When a request comes to the web server, the
  Map/GIS server application handles the request
  and returns a map image, attribute, geometry or
  downloadable data.
• The Map/GIS server can also return images of
  legends, scale bars and reference maps.
• Requests can query the spatial data and return
  only the data that matches the request.
• Some Map/GIS servers also support geometry,
  geocoding and geo-processing tasks requests.
  (i.e. buffer queries, clipping, etc).

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Components of Web GIS- Map/GIS Servers
Map/GIS Server Services

• A Map/GIS server can have multiple services of
  various types.
• Map service
• Geoprocessing service
• Geodata service
• Image service
• Geometry service
• Geocoding service
• Globe service
• A map service is a specified grouping of spatial
  data with projection and display information
  defined. For ESRI, a .mxd file can serve as the
  source for a map service.
• A Map/GIS server can allow for map services to be
  started and stopped.
• A map service can support multiple output formats
  (WMS, WFS, KML)

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Components of Web GIS- Map/GIS Servers
Map/GIS Server Services ESRI Example ArcCatalog
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Components of Web GIS- Map/GIS Servers
REST and SOAP API

• Some Map/GIS Servers expose their services via
  REST and SOAP APIs.
• REST API
• Representational State Transfer (REST) is a
  stateless protocol for leveraging representations
  of service data and methods.
• Provides a lightweight interface to access
  service properties and functionality through
  client side script.
• Example http//methionine.library.oregonstate.ed
  u/ArcGIS/rest/services
• SOAP API
• Simple Object Access Protocol (SOAP) is a
  protocol for creating server side classes and
  methods for a web service. SOAP tends to have
  more robust capability over REST, but can be more
  complicated to incorporate.
• Example http//methionine.library.oregonstate.ed
  u/ArcGIS/services/Restoration/OWRI_07_1/MapServer?
  wsdl

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Components of Web GIS- Mapping Applications

• A mapping application is a web component/page
  that handles requests/responses to and from the
  mapping server.
• Typical functionality includes handling
  navigation panning/zooming, layer management,
  attribute queries and advanced processing tasks
  (buffer, distance calculations, etc).

Examples of extensible Mapping Applications

• ESRI WebADF/JavaScript API
• Google Maps API /ArcGIS JS Extension
• Google Earth API
• Bing Maps API /ArcGIS JS Extension
• Bing Maps Silverlight API (Microsoft)
• Flex (Adobe) / ArcGIS Extension
• Yahoo Maps API
• OpenLayers API
• ArcGIS for iPhone API coming soon.

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Components of Web GIS- JavaScript Class Libraries

• JavaScript class libraries are an optional piece
  of a web GIS stack that can add some dynamic user
  interface components such as sliders, pop-up
  boxes, dynamic table grids, and AJAX
  (Asynchronous JavaScript and XML) handling.
• Some popular JavaScript class libraries to
  consider are

Dojo EXT.JS YUI (Yahoo User
Interface) jQuery Can get from
http//code.google.com/apis/ajaxlibs/
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What is a mashup?

• a mashup is a web page or application that
  combines data or functionality from two or more
  external sources to create a new service.
• The term mashup implies easy, fast integration,
  frequently using open APIs and data sources to
  produce results that were not the original reason
  for producing the raw source data.
• Source Wikipedia.

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A simple web mapping application

• Basic HTML and JavaScript will get you a long
  ways.

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ESRI Resource Center
http//resources.esri.com/arcgisserver/index.cfm?f
ahome
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Examples of Mapping Mash-ups

• Measure 37 Viewer
• ORWAP
• Oregon Restoration

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Measure 37 Viewerhttp//oeapp.oregonexplorer.info
/M37Viewer

• Virtual Earth/Bing Maps- JavaScript API
• Overlay WMS from ArcIMS
• Transparency slider, legend
• Create active objects (pushpins, polygons).
• Uses GET_FEATURES call to ArcIMS to draw
  polygons.
• 3D Functionality.

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ORWAP- Oregon Rapid Wetland Assessment Protocol
http//oregonexplorer.info/wetlands/ORWAP/

• Uses ArcGIS server map and geometry services.
• Buffers selected point and queries intersection
  of layers.
• Uses Virtual Earth/Bing JavaScript Extension for
  ArcGIS server.

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Oregon Watershed Restoration Tool

• ArcGIS Server 9.3 mapping backend
• Bing GeoRSS Collections for basin, subbasin and
  watershed council layers.
• REST and SOAP used for getting layer data and
  overlaying WMS.
• DOJO javascript class library for more
  interactive user interface.