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| GeoCommunity Mailing List |
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| Subject: | Re: GISList: GIS P2P - * Market Research Question * |
| Date: |
01/20/2003 08:21:53 PM |
| From: |
Ron Lake |
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Hi,
Please note that GML (the primary data encoding for geographic data) requires
that geometries have srsNames. srsName attributes can point to registry entries
that describe the coordinate system, thus proving the metadata you are looking
for. You can look at http://crs.opengis.org/crsportal/index.html for an
example.
Cheers
Ron
sonny wrote:
> This the kind of thing that OGC specifications address. Send a
> "getcapabilities" request against an OGC compliant Web Map Server or Feature
> Server, and you get XML document with the requisite metadata. Similarly,
> the Web Catalog/Registry specification under development will also allow you
> to query for data and services for multiple OGC compliant servers. This
> effort includes testing of industry protocols such SOAP, WSDL, and UDDI.
>
> Sonny Parafina
> Ionic Enterprise
>
> -----Original Message-----
> From: Paul Ramsey [mailto:pramsey@refractions.net]
> Sent: Saturday, January 11, 2003 12:39 PM
> To: Pat Waggaman
> Cc: Robert Heitzman: ajq3@spatialnetworks.com: gislist@geocomm.com
> Subject: Re: GISList: GIS P2P - * Market Research Question *
>
> One more issue, still in the vein of "not enough metadata". Your comment
> reminds me: most GIS data is in projected coordinates, and many GIS
> formats do not include embedded spatial reference system information. So
> a large quantity of the data in the system would not be locatable on the
> globe. The metadata about what coordinate system the data is in would be
> critical to providing a useful spatial search routine. I think this
> particular problem is the real sticking point to making a practical
> implementation.
>
> Pat Waggaman wrote:
>
> > The user has the opportunity of plugging in Lat / Long and seeing what
> > is available, if only the poorly documented data is available, that's
> > what you download: if there's a selection well get down to the "pick
> > and choose".
>
> --
> __
> /
> | Paul Ramsey
> | Refractions Research
> | Email: pramsey@refractions.net
> | Phone: (250) 885-0632
> _
>
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