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| Subject: | RE: GISList: 80% of data having spatial reference? |
| Date: |
12/07/2001 10:34:42 AM |
| From: |
Neil Havermale |
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Geography by proxy - thats an idea. What about spatial photography? Take a
picture. Get the point... Will spatial photography have depth of field?
Are there success-drains and run-sheds in those piles of purple-pixels?
MidNight Mapper
aka neil
http://www.redhensytems.com/mapcalc
-----Original Message-----
From: Pat Waggaman [mailto:waggaman@marimsys.com\
Sent: Saturday, December 01, 2001 12:40 AM
To: Graeme Brooke: gislist@geocomm.com
Subject: RE: GISList: 80% of data having spatial reference?
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
where the corner post is on the plot (in the simple GIS case of the
surveyor), we measure where the antenna is (the proxy for the geographical
measurement instrument - which is in turn the proxy for the corner post -
nested proxies here!)
So when high magenta values become trackable - for instance with visible
light satellite tracking - "the amount of magenta in the average football
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
Chorley
>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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