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Various PSS have been developed to date with diverse approach, application and scope
Wadbos and WEAP (Water Evaluation And Planning) are example of specific-purpose
PSS. Wadbos is designed for a specific area, the Wadden sea region while WEAP is
specific in terms of the object being planned. Many more PSS are designed as general
purpose such as What If?, CommunityViz, INDEX, and UrbanSim. There are still many
examples of PSS available from research institutions and commercial sectors. These
four PSS share some common characteristics such as their characteristic as a desktop
based system. UrbanSim is the only system that is based on an open source platform,
previously developed using Java and then Phyton language. The other three are
extensions for ArcGIS. Customization is available for What if?, INDEX and UrbanS
Users’ collaboration is facilitated by What if? and INDEX. The visualization aspect of
CommunityViz is better than others. It can produce 3D visualization and export the
result into SketchUp and KML formats for viewing in Google Earth. CommunityViz
and INDEX are more directed for small area (large scale) spatial planning, while
WhatIf? And UrbanSim are more for large area (medium to small scale) policy
panning