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| Subject: | RE: GISList: 80% of data having spatial reference? |
| Date: |
12/07/2001 10:34:42 AM |
| From: |
Pat Waggaman |
|
|
At 10:24 11/30/2001, you wrote:
>Spoken like a true GIS guy, Bill. But some stuff doesn't: the amount of
>magenta in the average football jumper for instance... :-)
Hmmm - for everything we do in GIS, we use proxies. We do not measure=20
where the corner post is on the plot (in the simple GIS case of the=20
surveyor), we measure where the antenna is (the proxy for the geographical=
=20
measurement instrument - which is in turn the proxy for the corner post -=
=20
nested proxies here!)
So when high magenta values become trackable - for instance with visible=20
light satellite tracking - "the amount of magenta in the average football=
=20
jumper" will become relevant GIS data.
Cheers from across the S. Pac,
Pat
>Graeme Brooke
>
>-----Original Message-----
>From: McGuyer William C Contr 88 ABW/EMO
>[mailto:William.McGuyer@wpafb.af.mil\
>Sent: Friday, 30 November 2001 11:03 PM
>To: gislist@geocomm.com
>Subject: RE: GISList: 80% of data having spatial reference?
>
>
>In all honesty is there any valid method of quantitatively determining the
>approximate percentage of ALL data having a spatial reference? In reality
>everything has some sort of spatial reference.
>
>Bill McGuyer
>GIS Consultant
>Intergraph Mapping/GIS Solutions
>(937) 257-2201, ext. 239
>WPAFB 88 ABW/EM
>
>
>-----Original Message-----
>From: Bill Thoen [mailto:bthoen@gisnet.com\
>Sent: Friday, November 30, 2001 1:08 AM
>To: gislist@geocomm.com
>Subject: Re: GISList: 80% of data having spatial reference?
>
>
>Steven Ramage wrote:
> > I believe it is generally attributed to the "Handling of Geographic
> > Information" - Report of the Committee of Enquiry chaired by Lord Chorl=
ey
>in
> > 1987. See also
> > http://www.agi.org.uk/public/what-is-agi/objectives/history.htm.
> >
>
>Chorley's quote is not in that URL. I'd really like to see that
>document as it appears to be a seminal paper in GIS -- especially in
>the UK. I did find a ref to it at
>http://www.stile.lboro.ac.uk/~gydrw/STILE/t0050020.html, but no
>quote. Is there anyone here near the Pilkington Library who could go
>look it up for us?
>
>I echoed that quote that Chris seeks (exaggerated to 85%) in GEO
>World in Feb 1999 (see last paragraph of
>http://www.gw.geoplace.com/gw/1999/0299/299gonln.asp), but I'll be
>dipped if I can locate my source now. I'm pretty sure I had seen it
>attributed to an Integraph exec back in the late 80's, but in
>searching my notes I found this:
>
>"70 to 80 percent of the activities and information your agency is
>concerned with are related to location"
>Somers, Rebecca. 1987. "Geographic Information Systems in Local
>Government: A Commentary." "Photogrammetric Engineering and Remote
>Sensing." 53(10): p. 1379.
>
>That puts the quote in 1987 also. Did Chorley read Somers or was it
>the other way 'round? Or was it is someone else, now lost in the
>mists of Time, who first struck the spark that ignited that quote in
>our group consciousness? This question comes up about every three or
>four years on the current GIS list, and I've not seen it answered
>definitively yet.
>
>Can anyone here peel back the layers of history and legend and find
>a documented reference that pins this concept/revelation to an
>earlier date?
>
>--
>- Bill Thoen
>------------------------------------------------------------
>GISnet, 1401 Walnut St., Suite C, Boulder, CO 80302
>tel: 303-786-9961, fax: 303-443-4856
>mailto:bthoen@gisnet.com, http://www.gisnet.com
>------------------------------------------------------------
>
>
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