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Subject: Re: [emergency] CAP Visualization (was RE: CAP Developers' Forum...)

Warning Systems also displayed polygons representing
the plumes from chemical disasters - the messages were
generated by other CAP providers.

We adapted some code we had used to display storm
cells in a previous application, and displayed the plumes

We used the Pepperwhite mapping software in a VB
environment. Well, actually, the map application was VB,
and the CAP parser / plume broadcaster was Java.

-jeff kyser

On Wednesday, May 19, 2004, at 03:28  PM, Art Botterell wrote:

> Kon -
> The idea of visualizing aggregate CAP traffic is an interesting one.  
> The <references> and <incidents> fields provide a mechanism for  
> associating multiple messages in a graph... provided that the  
> originator provides them, or that some reliable mechanism can be  
> devised for inferring such relationships after the fact.  As is so  
> often the case, the holdup appears to be at the input.
> (Of course, relationships could be built on the basis of sender, event  
> category or whatever, but it seems like in most cases the result would  
> be a simple set that might not be very interesting visually, except  
> perhaps when displayed geographically.)
> As for mapping, I've done a couple of demos plotting CAP location data  
> over a map... I used an open-source platform called OpenMap that reads  
> various formats including ESRI shape files, but a commercial GIS would  
> work as well if not better.  The ComCARE team (in particular, a  
> company called GeoDecisions out of Pennsylvania) has also done CAP  
> plots in a web mapping service.
> The CAP <polygon> tag, in particular, is derived from GML, so  
> GML-aware platforms should be able to use it pretty directly...  
> although extracting the points and constructing a new shape is pretty  
> easy.  <geocode> values require the use of polygon lookup tables...  
> easy in the case of well-known areas like ZIP codes or county (FIPS)  
> boundaries... less so in the case of system-specific zones that may  
> not be familiar to all recipients.
> - Art
> At 11:17 AM -0700 5/19/04, Kon Wilms wrote:
>> A few questions for other implementers:
>> 1. Is anyone else working on data visualization of mass amounts of CAP
>> alerts (such as treemaps, hyperbolic graphs, spatial trees, or such)?
>> 2. I would be interested to hear from the GIS folks as to what formats
>> they are using for vector data importing/plotting. If no-one is
>> implementing GIS as part of an application, are there any guidelines  
>> for
>> supporting GIS file formats in CAP reception/parsing (or do we need
>> some)?
>> Cheers
>> Kon
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