Re: [emergency-msg] GML and Resource

Gary -

 

Am out of the office for a couple of days.

 

But, as Karen suggests, if we do not put in extra geometry types beyond 
points, before we know it, implementers will be asking for an envelope or a 
polygon.

 

FYI, thanks to the IETF folks, we have access to GML schema for ellipses 
and a couple of other geometry types that are quite useful in emergency 
services.

 

Cheers

 

Carl

 

  
----- Original Message ----- 

  
From: 
  Ham, Gary A 
  

  
To:  
  

  
Sent: Tuesday, February 06, 2007 2:26 
  PM

  
Subject: [emergency-msg] GML and 
  Resource

  

  
Folks,

  
 

  
I am trying to write the Data Dictionary reference 
  for our implementation of GML using geo-oasis.

  
 

  
In our structure 
  we have a "Location Type" consisting of three elements:

  
1. 
  LocationDescription:  xsd:string

  
2. Address: 
  ciq:xal

  
3. TargetArea: 
  geo-oasis:where 

  
 

  
My discussion 
  will concern only number 3 on this list.

  
 

  
The schema shows 
  the TargetArea element to be of TargetAreaType from the types 
  schema.

  
TargetAreaType should then be of type 
  geo-oasis:WhereType.

  
This is consistent 
  with our other Types so I plan to make the Data dictionary entries consistent 
  with the schema.

  
So far, no 
  problem.

  
 

  
Question: How 
  broad do we want our location to be?

  
 

  
An 
  geo-oasis:whereType gives a choice of 

  
gml:Point

  
gml:LineString

  
gml:CircleByCenterPoint

  
gml:Polygon

  
gml:Envelope

  
 

  
Did we mean to 
  have Location have the option of all of these elements?

  
Or should I make 
  TargetAreaType a restriction on WhereType that limits the choices to one or 
  more of the options. 

  
 

  
I originally 
  thought that Point would be simple and appropriate for resource messages (the 
  larger scope is certainly needed for future updates to DE and CAP). But the 
  name as TargetArea makes me think the larger scope was intended by the 
  committee for resource messaging as well.

  
 

  
Personal opinion: 
  For resource, I would rather use Point. Too many options already are making 
  resource messages harder to deal with.   

  
 

  
I need a 
  consensus. 

  
 

  
 

  
R/s

  
 

  
Gary A. Ham 

  
Senior Research 
  Scientist

  
Battelle Memorial 
  Institute

  
540-288-5611 
(office)

  
703-869-6241 (cell)

  
"You would be surprised 
  what you can accomplish when you do not care who gets the credit." - Harry S. 
  Truman