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Subject: RE: [emergency] Circle and Polygon
I tend to listen closely when Len speaks up. Ciao, Rex At 8:26 AM -0500 6/10/05, Bullard, Claude L (Len) wrote: >Variations tend to be more complicated given >an overall system than local complexity in >an element type. Given a choice of having >YetAnotherGeometry for the data (presentation >being unavoidably variant), I'd choose to >use the GML. > >This is an information ecology choice. Which >part of the overall set of system applications >do you most want to be aligned with? This >cascades up all the way to the personnel implementing >the system and the code libraries they have to >work from. If emergency management systems >and GIS systems are to be closely aligned, you >want to stick to the GML by namespace. Look >at the point-to-point interchanges and ask >yourself which systems are communicating at >what rate. That will tell you where the hot >zones are, therefore, what is consuming the >most resources in all dimensions of the systems. > >Granted, providing a separate namespace context >creates massively verbose files and orthogonal >semantics, but naming conventions are worse. >GJXDM is a good example of naming conventions >become deranged. It takes an awful amount of >work to find the integer at the bottom of the >well. Assuming maximum independence of local >data ignores the realities of interoperating >systems. > >len > > >From: Art Botterell [mailto:acb@incident.com] > >On Jun 9, 2005, at 7:57 PM, Renato Iannella wrote: >> Again, my GML expert friend says that a polygon would look like: >> >> <gml:Polygon> >> <gml:exterior> >> <gml:LinearRing> >> <gml:pos>12 4</gml:pos> <gml:pos>12 8</gml:pos> ... >> </gml:LinearRing> >> </gml:exterior> >> </gml:Polygon> > >Hmmm. I think one of the keys to the early update of CAP has been >that simple concepts are represented in simple ways. > >Other folks may feel differently, but I'm not certain the EDXL >routing application really needs the full functionality provided by >this much bulkier representation. E.g., in the past we've handled >included polygons... which much more often involve different >information or instructions than mere exclusion... by overriding them >with other blocks referencing other simple polygons. > >So it sounds like the TC may need to revisit the question of whether >we want to follow the GML standards in full, or some other precident, >or stick to a simplified model. > >--------------------------------------------------------------------- >To unsubscribe from this mail list, you must leave the OASIS TC that >generates this mail. You may a link to this group and all your TCs in OASIS >at: >https://www.oasis-open.org/apps/org/workgroup/portal/my_workgroups.php -- Rex Brooks President, CEO Starbourne Communications Design GeoAddress: 1361-A Addison Berkeley, CA 94702 Tel: 510-849-2309
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