Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!ames!amdahl!littauer From: littauer@uts.amdahl.com (Tom Littauer) Newsgroups: comp.graphics Subject: Re: more information on digital maps Message-ID: Date: 22 Mar 90 01:35:43 GMT References: <4636@helios.TAMU.EDU> Reply-To: littauer@amdahl.uts.amdahl.com (Tom Littauer) Distribution: usa Organization: Amdahl Corporation, Sunnyvale CA Lines: 34 In article <4636@helios.TAMU.EDU> hmueller@wfsc4.tamu.edu (Hal Mueller) writes: > >For some areas of the country finer resolution data is available. DLG >exists at 1:100 000 scale. DLG and DEM exist at 1:24 000 scale (a 7.5' >quad map). DLG for hydro and transportation exists at 1:100K for almost all of the country (a few small holes). It costs ~$60K and occupies ~20GB of disk. We based our UniForum demo on this data, so I know :-) It was fun to have some guy walk up and say OK, show me Toad Suck Arkansas and be able to pull up a map of it and the neighborring smaller town, Toad Suck Ferry. >The finer resolution stuff is not a complete data set. It is handled >by 4 regional ESIC offices; I called EROS Data Center to find out >the name and number of the regional office that handled my particular >area. The regional office has a listing of what's available. Prices >seem to be the same as for the coarse data, but of course you'd need >more files for the entire country. The USGS is quite helpful at figuring out what files you need to cover the area you're interested in, and can coordinate in the case of bizaare requirement like ours was (you want *WHAT*?). You're quite right in saying that decoding the data and figuring out which file it's in is "interesting". Have fun, Tom Littauer -- UUCP: littauer@amdahl.amdahl.com or: {sun,decwrl,hplabs,pyramid,ames,uunet}!amdahl!littauer DDD: (408) 737-5056 USPS: Amdahl Corp. M/S 278, 1250 E. Arques Av, Sunnyvale, CA 94086 I'll tell you when I'm giving you the party line. The rest of the time it's my very own ravings (accept no substitutes).