Developing Internet-Based GIS Applications

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http://www.digitalearth.net.cn/gisconference/developing%20internet-based%20gis%20applications.htm


Abstract
Developing applications for the Internet is one of the newest challenges developers face today. The growing capability of the Internet has created a demand for applications that use geographic information systems. When building GIS applications for the Internet, a developer can choose any of a number of architectures, technologies, and methods. This paper examines several of the techniques that can be used to develop Internet-based GIS applications using MapObjects with both MapObjects Internet Map Server (IMS) and Active Server Pages (ASP). The findings and techniques discussed are based on three GIS applications developed by INDUS Corporation.


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Introduction
INDUS Corporation was recently contracted by a government agency to develop an Internet-based GIS application that would integrate data from the various organizations within a community and provide an analytical and support system to participants across the community.  This project was part of a pilot program and was to be deployed in several cities that met certain criteria.  This eliminated the typical restrictions of a software design and development project, and allowed the freedom to make recommendations for the system's implementation based on best industry practices.

Our goal was to develop a system that was open and could be ported to the various cities with minor modifications.  The general requirements for the system were to provide basic mapping, querying, and reporting capabilities, and to be deployed via an Intranet/Internet mechanism. In addition, the system was to use a collective data repository consisting of geocoded spatial, and related tabular data from various organizations within the community.  To meet these general requirements, we developed an Internet-enabled GIS application built on ESRI MapObjects v1.2, MoIMS v2.0, Microsoft (MS) VisualBasic 5.0, and MS IIS 4.0.  After completion of the first pilot project, we continued enhancements to the application while maintaining the overall application's architecture and design, and developed a modified version for the second pilot.  As we learned more about the capabilities and limitations of the Internet, we developed a third version based entirely on ASP and MapObjects v2.0.  Each system could utilize any ODBC compliant database in the back-end.  This paper discusses the design considerations, architecture, development and deployment and related issues of these Internet-based GIS systems developed by INDUS.

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