Figure 2. Spatial analysis functions
2.3 Web Publication
The greatest problem for decision makers, resource managers and user who handle information is accessing the right information at the real time.
Internet is a global, public collection of individual networks that is operated by private organizations, universities, and government agencies Maududie, et. al.,
2002. GIS takes advantages of the internet as a media of GIS dissemination, so that the GIS data can be accessed by different computers or servers from
anywhere across the internet. To be able to access and share remote GIS data, the system requires high interoperability Peng, et. al., 2003. The internet and web-
based GIS is an effective medium for publication of spatial data. Web-based GIS is not a single technology, there are many combined components to build web
based GIS, such as software and hardware. These technologies are related to web based GIS including Object-Oriented Language, GIS package and language,
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HTML and web scripting, and the theories about GIS. It is important to define the different forms of web-based GIS, before selecting a specific location for any
given application. One type of web-based GIS applications is Map Generators. Map
generators use a web-based browser form. The user enters specifications of drought event such as location, thematic layers and symbols on the form. The
form is passed to the web server. A gateway at the web server passes the request to a GIS server. For instance, the gateway could pass the request in the form of
AML to an ArcINFO server. The ArcINFO server generates a graphic file, which is converted to a GIF image. The GIF image is sent back to the client and
viewed using native browser capability. The advantage of map generators is creating custom maps on the fly. Disadvantages include lack of access to the raw
spatial data, typically at a slower speed, limited predefined user choices, and involved setup.
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III. RESEARCH METHODOLOGY
3.1 Time and Location
The research was conducted from February until June 2007 at MIT- BIOTROP covering Karawang District, West Java. Image processing and
analysis of satellite data have been conducted from March to May 2007 at the National Institute of Aeronautics and Space LAPAN.
3.2 Data and Sources Properties
Kategori