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| Subject: | RE: GISList: GIS P2P - * Market Research Question * |
| Date: |
01/20/2003 08:21:53 PM |
| From: |
sonny |
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Paul,
Napster and P2P (Kazaa, Groove, etc) programs are essentially programs that
implement a protocol to share data about files between client/servers and
peers. This is what OGC standards offer - published and publically
available protocols to share data.
If you build a client that can issue Web Feature Server (WFS)
getcapabilities, getfeature, getfeatureinfo requests and understands what to
do with a GML document, e.g. turn it into your native GIS file format: then
you can enable Napster/P2P like sharing. The client can be standalone
program, a web-based interface, a thick GIS client such as GeoMedia, or a
map viewer such as BBN's OpenMap. As Ron has noted, the advantage of using
OGC standards is that the requisite metadata is embedded into the GML.
Sonny Parafina
Ionic Enterprise
-----Original Message-----
From: Paul Ramsey [mailto:pramsey@refractions.net]
Sent: Sunday, January 12, 2003 11:37 AM
To: rlake@galdosinc.com
Cc: sonny@ionicenterprise.com: ajq3@spatialnetworks.com
Subject: Re: GISList: GIS P2P - * Market Research Question *
Ron & Sonny,
All true enough in the Brave New World of universal OGC standardization,
but what was being discussed was a Napster-style means of sharing GIS
files produced by the technology people are using on a day-to-day basis
right now. I think it is a wonderful concept, but as noted below, there
are some practical limitations in the current file formats themselves
which impede the potential of making a drag-n-drop desktop utility.
Paul
Ron Lake wrote:
>
> 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.
>
> 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.
>>
>>-----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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