International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
extract new GML features and send them the style engine for
styling. The styled SVG will send to the Web for display again.
SVG links can also trigger server events to query database.
For implementation, many free tools are available now. One of
advanced tools for distributing GML and SVG data is the
GeoServer project which is the open Internet gateway for
geographic data (http://geoserver.sourceforge.net). GeoClient,
which is a part of the GeoServer project, is graphical software
for online mapping. GeoClient is designed to work as a client
to a server operating on the Open GIS Consortium's Web
Feature Server standard. It is written in Scaleable Vector
Graphics (SVG) and ECMAscript/JavaScript. Some basic
functions of map interface are available such as zooming,
panning, querying and identifying attributes. The prototype will
be based on the tool of GeoServer and GeoClient to be further
developed and customized. Figure 6 shows the SVG Web map
using Hong Kong base map data.
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Figure 6 The interface of SVG Web map using Hong Kong base
map data.
The possibility of editing data through Internet will be tested.
For example, people can digitize the route of their truck by
mobile devices. With this function, people can edit and get real
time information anytime, anywhere.
4. CONCLUSIONS
The paper describes an ongoing project and addresses the new
idea of deploying GIS data through Internet with open and
standard application and design algorithms for online data
editing capability. The framework is based on open and non-
proprietary standard, which provide ideas of distributing GIS
data and application in Hong Kong by using open and standard
way.
We have proposed a framework for integrating distributed Web-
based GISs by using GML and SVG technologies. The study of
generating GML, GML schema, XSL stylesheets and SVG, the
methodology of the framework has been examined and
developed.
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