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Kuala Lumpur Test Case
The Department of Survey and Mapping Malaysia (JUPEM) is among the main government organizations providing high quality spatial data, survey and mapping products and services to the government, business, public and individuals for the purpose of national development, security and defence.

In line with the government's effort to push Malaysia to achieve developed nation status by the year 2020, there are various initiatives that have been drawn up to bring the country closer to that objective. One of this is the e-government initiative of using technology for the improvement of many services and sale of various products rendered by JUPEM.

JUPEM has about 1.9 Terabytes (TB) of digital spatial data which are available for government, business, and public and individual’s consumption [2]. Basically, three datasets from JUPEM pertaining to the above types of digital spatial data were utilised for the implementation of the research task. The followings explain the data supported by JUPEM.

1. Cadastral data or land parcel data are handled by the states JUPEM. The data are produced and stored in the form of continuous database and raster file data. The data are produced from field survey in the form of vector point, line and polygon geometry. Raster data are scanned images of the certified plan stored in the database for Internet browsing. Land parcel data were produced using ESRI’s ArcView and Geomedia. The coordinate system applied to the vector data is the local Cassini-Solder.
2. Topographical mapping data are handled by a section at JUPEM Head-Quarters called CAMS (Computer Assisted Mapping System). The data are produced and stored in the form of vector file namely DST and DXF. The production process used the Norwegian GINIS software to digitise hardcopy map and aerial photograph, and to produce vector map from field topographical survey. The Rectified Skew Orthomorphic (RSO) coordinate system is applied to topographical mapping data.
3. Aerial/Orthophoto images are produced and stored in digital and hardcopy form by the Aerial Photography Section in JUPEM.

As mentioned these datasets are collected, stored, and maintained in several sections as well as in different systems. These datasets have been chosen for use in this research due to their heterogeneous and proprietary nature in terms of format, resolution, and source, amongst others. The combination of these heterogeneous and proprietary factors offers good examples of the problems regarding geospatial interoperability [3]. The implementation undertaken in this research uses current interoperability standards to serve to a standard web browser both JUPEMs’ raster and vector data.

Facilitating this, a range of datasets, pertaining to land and map information from JUPEM within the Federal Territory of Kuala Lumpur (FTKL), a state of Malaysia, has been used. As mentioned, this research used three types of spatial data namely, land parcel data, topographic data and aerial images. These data are chosen to highlight issues and provide a basis for exemplifying possible solutions to the problems of GI distribution via the web.

Figure 1: Context diagram of the single portal access of the various data

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