The State Cartographer's Office catalogs, stores, and provides geodetic control information for the state of Wisconsin. Wisconsin geodetic control information is maintained at the federal, state, and local levels. Currently, we update control 'layers' independently with each agency according to their publishing schedule and ability to provide updated information. Geodetic control is projected into a common view and users can visually navigate to, locate, and query control points.

The next step in distributing this information to the widest possible audience is to publish this geodetic control information as an INCITS-L1 standards-based service in the Open Web Services (OWS) architecture. This will enable a comprehensive view and access point to Wisconsin geodetic control information from distributed source agencies through a single portal-like service. We aim to facilitate more automated update of our index of statewide control information by encouraging agencies to make their control accessible through map services, specifically, point feature services encoded in GML format. The technology to do this is recent and the visible working models are few.

Web Services need to provide a solution of database schema transformation among different schema adopted by distributed agencies. The Federal Geographic Data Comittee and the State Cartographer's Office are working on a standard geodetic control schema. This project also investigates ways of handling user queries, sending these queries to different sources with different schema, and transforming schema.

The following links provide examples of the results of the grant. For more information, visit the individual sections listed above.

NGS Geodetic Control Points from Mapserver

These links provide responses from requests to a Mapserver WFS server. The GetFeature response is the GML output, which is GML2 and not compliant with the FGDC Framework schema. This service can be opened in a WFS client.

WFS GetCapabilities
WFS DescribeFeatureType
WFS GetFeature

Transformed WFS Service

These links provide a WFS service like the first three links, except the output has been transformed to meet the framework data content standard.

WFS GetCapabilities (GML 2.1.2)
WFS DescribeFeatureType (GML 2.1.2)
WFS GetFeature (GML 2.1.2)

WFS GetCapabilities (GML 3.1.1)
WFS DescribeFeatureType (GML 3.1.1)
WFS GetFeature (GML 3.1.1)

Schemas

These schemas are based on the Framework Data Content Standard for Geodetic Control.

Geodetic Control Schema for GML3
Geodetic Control Schema for GML2

Other Available Control Point Services

County Control Points - WFS GetCapabilities
USGS Control Points - WFS GetCapabilities

Geodetic Control WMS Service - WMS GetCapabilities
Geodetic Control WMS Service - WMS GetMap

NGS Geodetic Control KML - add URL as a Network Link in Google Earth