I believe they were meant for two different purposes. Topozone is based on USGS topographic maps - it makes sense that it would be better for locating cemeteries or other features using latitude and longitude. TIGER is based on street addresses. From and to street addresses for every street segment allow other addresses to be located in relation to street segments (called topological encoding). TIGER was designed to work with features that can be located by street address - a function that cannot be done with the topographic maps. If you want the computer to give you directions from 123 Main Street to 456 Maple Avenue, you'd need to use TIGER files or some variation. The topographic maps don't have any topology other than latitude and longitude. Chris Andrle ----- Original Message ----- From: "W. David Samuelsen" <dsam@sampubco.com> To: <NY-HUDSONRV-L@rootsweb.com> Sent: Thursday, August 07, 2003 2:58 AM Subject: Re: [HudsonRV] Re: Mapquest, etc. > Tiger stinks compared to Topozone now listed first by US Geological Survey's > > http://geonames.usgs.gov/pls/gnis/web_query.gnis_web_query_form > > The link to Topozone is very recent - about 2 months ago. Best that > ever happened. > > With that, I was able to report more cemeteries not previous listed. > The requirement is that you use GPS and supply the longitude and > latitude locations to them. Take about 2 weeks to check and update. > > David Samuelsen > > Chris Andrle wrote: > > Both Expedia and MapQuest use the US Census Bureau's TIGER (Topologically > > Integrated Geographic Encoding and Referencing) map files to produce their > > maps. The TIGER files contain errors because the Census Bureau did not have > > funding to correct them beyond their immediate need which was to facilitate > > census taking. Some companies make their own corrections to the census data, > > others use them as is. > > > > Chris Andrle > > > > > > ----- Original Message ----- > > From: <SwimBails@aol.com> > > To: <NY-HUDSONRV-L@rootsweb.com> > > Sent: Wednesday, August 06, 2003 11:50 AM > > Subject: Re: [HudsonRV] Re: Mapquest, etc. > > > > > > > >>I don't know where Expedia and Mapquest get their maps from but i have > > > > heard > > > >>that the major map makers make small errors each year as a way to > > > > copyright > > > >>their products. If the errors show up in something that is sold, they > > > > sue. > > > >>Usually they take some very small street (like North St.in North Albany) > > > > and > > > >>either move it or wipe it out completely. > >> > >>One year, our little one block dead-end street was wiped out by Rand > > > > McNalley > > > >>and we had an awful time with deliveries of UPS, pizza and other things > > > > for > > > >>one year. > >>Then they picked on someone else. :-( > >> > >>Perhaps this is what happened to you, Katherine. > >> > >>Jean > >> > >>In a message dated 8/5/03 11:08:52 AM, kgb2@centurytel.net writes: > >> > >><< I don't know about Expedia, as I have never used them, but Mapquest > > > > places > > > >>the house that I presently live > >>in about 10 miles from its actual location, and on a completely different > >>road. > >>Kathryn >> > >> > >> > >>==== NY-HUDSONRV Mailing List ==== > >>The NY-HudsonRV Mailing List Website > >>http://www.connorsgenealogy.com/HudsonRV/ > >>Site good for unsubbing, changing subscription, archives, links, etc. > >> > >> > > > > > > > > > > ==== NY-HUDSONRV Mailing List ==== > > The NY-HudsonRV Mailing List Website > > http://www.connorsgenealogy.com/HudsonRV/ > > Site good for unsubbing, changing subscription, archives, links, etc. > > > > > > > > > > ==== NY-HUDSONRV Mailing List ==== > The NY-HudsonRV Mailing List Website > http://www.connorsgenealogy.com/HudsonRV/ > Site good for unsubbing, changing subscription, archives, links, etc. > >