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From: rthomson@mesa.dsd.es.com (Rich Thomson)
Newsgroups: comp.graphics
Subject: Re: WANTED: maps
Message-ID: <1991Apr1.231108.2567@dsd.es.com>
Date: 1 Apr 91 23:11:08 GMT
References: <1991Mar18.201747.23217@cec1.wustl.edu> <91079.190330UH2@psuvm.psu.edu> <1991Mar22.155204.26170@tfic.bc.ca> <11225@scicom.AlphaCDC.COM> <1991Apr1.215213.26334@tfic.bc.ca>
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In article <1991Apr1.215213.26334@tfic.bc.ca>
	clh@tacitus.UUCP (Chris Hermansen) writes:
>[stuff deleted]
>
>[...] The Feds have two programs, one at 1:50,000 and one at 1:250,000.
>[...] I think both series are NAD27.
>
>Provinces typically have their own base mapping program at larger scales.
>For example, BC has two (!) 1:20,000 programs: one by the Ministry of Crown
>Lands (planimetry, topography, NAD83 - nice stuff, too), [...]

    NAD27 -- North American Datum 1927
    NAD83 -- North American Datum 1983

    Each of these refers to a set of parameters defining the ellipsoid
of the Earth.  See USGS Professional Paper 1395 for a detailed
explanation of each of these coordinate systems.

							-- Rich
-- 
  ``Read my MIPS -- no new VAXes!!'' -- George Bush after sniffing freon
	    Disclaimer: I speak for myself, except as noted.
UUCP: ...!uunet!dsd.es.com!rthomson		Rich Thomson
ARPA: rthomson@dsd.es.com			PEXt Programmer