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Subject: RE: Feedback from OGC members on FIPS query to obtain geometry (polygon) for use in CAP demonstration
After our teleconference today, I put out a query to the OGC membership asking if there are any web accessible services/portals out there that could be accessed using some level of query, such as a FIPS code, and have a geometry returned. (In OGC parlance, geometry = coordinate set for a given geographic entity. Not to be confused with a feature, a feature collection, or a geometry collection :-) ) In a couple of hours, I received half a dozen responses. There were some questions back to the EM TC: 1. What is the Area of Interest for the demonstration? 2. What payload format should the geometry be returned in? (The OGC member recommendation is that the geometry response should be GML) 3. What level of FIPs code (i.e., what type of administrative boundary)? In general the responses were along the line of "If the goal is to retrieve GML for a layer based on simple query like a fips code, it's fairly simple to generate a (WFS) GetFeature with a query filter specifying the parameter by which to limit the response". Now, WFS is the OpenGIS Web Feature Service Interface specification. GetFeature is the interface to retrieve a feature or set of features and their associated geometry. The query filter allows the client to specify the query and send it to a WFS. May sound a bit complicated but is actually pretty simple. Their are some Open Source WFS implementations. Anyway, below my signature are the unedited responses from the OGC members. Most of their confusion is probably because I did not frame the question very well. Cheers Carl ================================================= Carl: What is the demonstration territory? The counties in the Baltimore/Washington CMSA, the rest of the counties in MD and the three counties in DE are accessible from the WebTIGER prototype application that includes WMS and WFS. See http://aries.geo.census.gov/index.html for descriptive project web pages that will lead you to WebTIGER. You could get the detailed county boundaries and attributes from it. Or if you want to roll your own, you can also download the TIGER/GML version 3 files WebTIGER is serving. Or there are TIGER/GML version 3 files for the 5 counties around Detroit MI on the CIPI-1.2 portal. Or see http://www.census.gov/geo/www/tiger/index.html for TIGER/Line files of several vintages for all the counties in the U.S., or see http://www.census.gov/geo/www/cob/index.html for generalized county boundary files in ArcInfo Export, ArcView shapefile, and ArcInfo Ungenerate (ASCII) formats. Cheers, Paul Paul.W.Daisey@census.gov U.S. Census Bureau ======================================================== Hi Carl, We have a WFS with counties from BTS, the data contains the state and county FIPS code so you can use a standard filter query to retrieve the counties. How do they want the boundary information returned? Portrayed? GML2 or 3? Zipped up shape file? SVG? These are all available. I'm still tuning memory on the server, big requests blow out the stack, but if they only returning on county feature per request, then it shouldn't be a problem. Capabilities: http://www.redspider.us/ionicweb/wfs/NTAD2002?version=1.0.0&request=GetCapab ilities&service=WFS DescribeFeature: http://www.redspider.us/ionicweb/wfs/NTAD2002?version=1.0.0&request=Describe FeatureType&service=WFS&typename=BTS_COUNTY I just wanted to show you that I actually do something productive in addition harassing people on mailing lists. Regards, sonny IONIC Enterprises ================================================================== Carl: I believe we can accommodate OASIS using GIS Portal and GeoSecurity. We would be interested in learning more. Could you have someone contact me with further information? Jim James A. Aylward Executive Vice President Harvard Design & Mapping (HDM) 1601 N. Kent St., Suite 1102 Arlington, VA 22209 T: 703-224-1414 x211 F: 703-224-1818 New Cambridge Office Address - Effective August 1, 2003: 125 CambridgePark Drive, 3rd Floor Cambridge, MA 02140 T: 617-354-0100 x211 F: 617-868-6855 C: 617-233-8424 W: http://www.hdm.com SMS: 6172338424@messaging.sprintpcs.com ================================================= I have FIPS code via TIGER Census data (and some other sources) with WFS access. I also have an alert/notification implementation (via old OCG sensors spec). Also reviewed the draft OASIS CAP last week. Could you be more specific on what/which FIPS code? Also, I do not have the HTTP CAP Request format (protocol). I should be able to produce a CAP document with polygons via query, but I currently do not have county boundaries, have Congressional dist, municipal bdy, county subdivision, urban area in WFS/GML. Current query is by bounding box, not FIPS. Rick Tynes 703-428-6838 ext 2232 Tynes, Richard D ERDC-TEC-VA <Richard.D.Tynes@erdc.usace.army.mil>
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