The Open Geospatial Consortium (OGC) defines a number of standards, both for data models
and for online services, that has been widely adopted in the Geographical Information System
(GIS) community. This has lead to a number of software development efforts, online data
archives, and application communities. We survey these in the first part of this report. We
furthermore find that the OGC standards are very compatible with Web Services standards,
although they are not technically implemented this way. We therefore, in the second part of
this report, describe our group’s efforts to reimplement OGC standard services as web
services. We focus particularly on the Web Map Service.
We also have built bridging services that allow our Web Service compatible WMS to interact
with non-Web Service versions of WMS. Cascading WMS is the key point in our proposed
solution for the interoperability problems in the GIS WMS services. Since Web Service
oriented WMS has different request response paradigm from non-Web Service versions, we
have extended cascading WMS by adding request handler functionality. This kind of WMS
behaves like both a cascading WMS and a proxy to handle different types of requests to
overcome interoperability problems between different WMS systems.

We describe our continuing work on implementing Open GIS Consortium (OGC) compatible Grid
Services for the International Solid Earth Research Virtual Observatory. Our initial efforts focused
on collecting Earthquake and GPS data from various sources, converting them to GML and
enabling query capabilities using pure Web Services approach. We have extended this work by
creating Web Services implementations of OGC-Web Feature Service and OGC-Web Map Service
for serving GML-formatted data. We also describe a Fault Tolerant High Performance Information
System (FTHPIS) to tie these services together.

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The Open Geospatial Consortium (OGC) defines a number of standards (both for data models and for online services) that have been widely adopted in the Geographical Information System (GIS) community. In this paper we will describe our group’s efforts to implement GIS services according to OGC standard specifications in accordance with the Web Services approach. This paper focuses on the Web Map Service (WMS), which we are coupling to problems in computational geophysics. Through the use of Web Services, we are able to integrate GIS services with other families of services, including information, data management, and remote application execution and management. We also describe WMS client building efforts that are suitable for integration with computational Web portals. To be able to interact with non-Web Service versions of WMS, we have built bridging service for our extended WMS. Since Web Service oriented WMS has a different request/response paradigm from non-Web Service versions, we have extended cascading WMS by adding request handler functionality. This kind of WMS behaves like both a cascading WMS and a proxy to handle different types of requests to overcome interoperability problems between different WMS systems.

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