Web Mapping Testbed, Phase 2

The Web Mapping Testbed Phase 2 (WMT-2) expanded on work done in WMT-1. It resulted in more federal data coming on-line using WMT protocols and laid a foundation for OGC Pilot Projects that tested and demonstrated the new capabilities. WMT-2 resulted in improvements to GetFeatureInfo, GetMap, and GetCapabilities, the basic elements of the Web Map Server Interface Specification. It also resulted in a proposed service interface specification for accepting multi-dimensional query requests and responding with portrayals (symbolized graphics) of the results (with associated legends). New draft OpenGIS Specifications for the following also resulted:

-- OpenGIS Web Feature Server Specification, a service interface specification for accepting spatially enabled SQL-like query requests and responding with Geography Markup Language (GML) feature collections. (GML, developed during WMT-1, is OGC's standard system for XML encoding of geographic features.)

-- An OpenGIS Filter Encoding Specification, that is, an encoding specification for spatially enabled SQL-like filter grammar.

-- OpenGIS Web Coverage Service Specification, for accepting multi-dimensional query requests and responding with gridded data values (coverages).

-- Imagery Markup Language (IML): An XML encoding standard for images, gridded data, and textual and graphical annotations on imagery and maps.

-- General Services Model: Encoding specification for representing services metadata, service capabilities and service interfaces using XML

-- OpenGIS Styled Layer Descriptor: An XML encoding specification for associating cartographic symbols with properties of features.

-- OpenGIS Feature Identifier Specification: This enables applications to identify a feature in one map as being the same feature represented in a map from another source on the Web.

WMT-2 sponsors included the U.S.Federal Emergency Management Agency (FEMA), the U.S.Federal Geographic Data Committee (FGDC), GeoConnections (Canada), the U.S.National Aeronautic and Space Administration (NASA), the U.S.National Imaging and Mapping Agency (NIMA), the U.S.Army Engineering Research Development Center (ERDC), and the U.S. Geological Survey (USGS).