CEHTP Traffic Linkage Demo

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CEHTP Traffic Linkage Service Demonstration

This web page is an example of a client that utilizes the California Environmental Health Tracking Program's (CEHTP) Traffic spatial linkage web service. This service computes traffic-related metrics on CalTrans Highway Performance Monitoring System (HPMS) 2004 data in California. All geospatial operations are performed on the server-side, while contact between the client (web server) and the GIS server is limited to Simple Object Access Protocol (SOAP) input/output parameters.

Problem
- CEHTP partners would like to perform spatial analyses on environmental and health datasets, but often lack the GIS expertise, software/hardware resources, and/or easy/ongoing access to commonly used datasets.
- Environmental health geospatial analyses have historically been accomplished on a GIS technician's desktop. The vision of the National Environmental Health Tracking Network calls for the creation of standards-based tools that allow clients to perform systematic integration of environmental and health datasets. This means that typical desktop geospatial operations must be ported to an enterprise context.

Solution
- The CEHTP is working in cooperation with the NEHTN to develop standards-based methodologies for geospatially integrating environmental health data. We call this "Spatial Linkage" services, because geospatial analysis operations that link environmental and health data are offered as a service over the Internet. Through Spatial Linkage services we aim to expose through Web Services (SOAP) relatively simple and typical geospatial integration methods.
- The CEHTP is creating a Spatial Linkage architecture that not only establishes standards for interoperability but also for data content. Please see the following document to see some of our thinking around Spatial Linkage.
- CEHTP partners will have the opportunity to utilize Spatial Linkage services in such a way that they not only perform geospatial linkages with their own data, but they can also develop their own applications that interface with the service.

Benefits
- CEHTP has in-house expertise to ensure that programs are utilizing and implementing Spatial Linkage services successfully. CEHTP encourages data owners to form partnerships with CEHTP and to expose their spatial-enabled data holdings as Spatial Linkage services. CEHTP has already created many of the components that are used in a Spatial Linkage service and is prepared to share them. Many federal granting programs (such as the EPA Exchange Network) fund partnerships that emphasize products like Spatial Linkage services.
- Web services can be invoked from any platform that can send/receive XML documents or perform a Remote Procedure Call. CEHTP can provide participating programs pre-packaged clients in .NET, Java, or other platforms (e.g. AJAX), if feasible.
- This Spatial Linkage demo is available within the DHS Intranet as well as on the Internet. Secure Sockets Layer (SSL) can be used for encrypted transmissions.

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