Article:		Mapping and Markup, Part 1
Subject:		Sounds Good. Not Good.
Date:		2004-12-03 06:29:57
From:		Len Bullard
"What you've got so far isn't really a mapping system. It's the underpinnings of a vector-based drawing system. Indeed, basic SVG gives you as much, and if that's all you need, then you don't need to cloud your understanding with an additional standard beyond SVG." Sounds good until the client asks you to take the plant design and put it on the geography as seen and do a fly through. Then you need 3D. SVG only gets you a map and in many cases, not one good enough for real time performance in dispatch applications. That is why the real time dispatch systems use proprietary display formats backed up with ESRI data sources. len

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• Sounds Good. Not Good.
  2005-01-05 08:47:30 Carl_Reed [Reply]
  
  Len -

  
  Interesting comment. You might be interested in two presentations being given at the next OGC meetings (This month, NYC). One is on CityGML, a 3d GML application schema for city models. The other is for the interface to a portrayal service for 3D visualization called Web 3D Service (W3DS). It explicitly addresses medium client environments, which allow users to interactively navigate through virtual 3D worlds. Both capabilities and the related candidate OGC standards were developed by NorthRhine Westphalia in Germany. While these may not be light-weight enough for some emergency applications, the move into 3D and near real time portrayal using standard interfaces is extremely positive for that market space.

  
  Regards

  
  Carl
  
  
  

• Sounds Good. Not Good.
  2005-01-04 13:45:59 Ron Lake [Reply]
  
  SVG is for 2D drawing. It can do a very nice job of drawing maps and GML is not intended to do that. It is intended to describe geographic objects and not how they might be graphically presented. GML and SVG are complementary technologies.