Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!apple!oliveb!amiga!jimm
From: jimm@amiga.UUCP (Jim Mackraz)
Newsgroups: comp.graphics
Subject: Re: Computerized maps
Message-ID: <3895@amiga.UUCP>
Date: 6 Jun 89 18:34:11 GMT
References: <2645@portia.Stanford.EDU> <11982@well.UUCP> <3867@eos.UUCP>
Reply-To: jimm@cloyd.UUCP (Jim Mackraz)
Organization: Commodore-Amiga Inc, Los Gatos CA
Lines: 34

In article <3867@eos.UUCP> eugene@eos.UUCP (Eugene Miya) writes:
)In article <11982@well.UUCP> nagle@well.UUCP (John Nagle) writes:

)>      This is high-quality data, with the primary sources being USGS maps
)>and aerial photographs.  It's not just rehashed commercial roadmap data.
)
)Sorry, but for some reason "Highly" accurate and "high"-quality
)don't jib with USGS or aerial photos.  I saw another follow up on thse cost.
)That's the key.  The USGS maps have quality, but you don't build houses
)on their low resolution.  The point is that different qualities are used
)for different purposes.  Aerial photos have numerous problems to
)prevent them from ever being used as maps. 

There is a standard basis from which Etak and others in the computer
roadmap business began and enhanced mightily.  It is the result of some
work done for like the 1960 census or something (my details will suck
this time).  I'm not sure if you get them from USGS or a different
organization.  They are raw, and inconsistent.

There is a new format "coming" from the same source, something called
the TIGER database.  It should be better, but I'm sure coverage od
different areas will creep out over time.

Sorry I know longer have my notes on the several map data vendors out
there.  One of them is in Lyme (NH, CT, ...?).

Useful, eh?
	jimm
    
-- 
Jim Mackraz, I and I Computing	   	"He's hidden now, but you can see
{cbmvax,well,oliveb}!amiga!jimm          The bubbles where he breathes."
							- Shriekback
Opinions are my own.  Comments are not to be taken as Commodore official policy.