Any local surveyor or civil engineering firm will know where the benchmarks are. Also see: http://www.ngs.noaa.gov/cgi-bin/datasheet.prl Don
Jim Lux > On 9/13/11 4:24 PM, li...@lazygranch.com wrote: >> I think I mentioned this is a thread one before. If you are really >> interested in position accuracy, you look up a calibrated point from >> the USGS that you can safely and legally access, then take a reading. >> I say safely because many points are in the middle of the street. >> Legally means no trespassing or you ask permission. My preference is >> to find one in a park. >> > > Often, you can talk to the local city/county and find out where some > accurate benchmarks are, typically on a curb. They are used to define > street positions and such. > > May not be accurate to centimeters, and you'll almost certainly have to > convert from some state plane coordinates. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- "Neither the voice of authority nor the weight of reason and argument are as significant as experiment, for thence comes quiet to the mind." R. Bacon "If you don't know what it is, don't poke it." Ghost in the Shell Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.