On Tue, Sep 13, 2011 at 11:22 PM, Don Latham <[email protected]> wrote: > Just looked up all USGS maintained benchmarks within 30 mi radius of my > home. One, at about 1.7 mi is a class A. the search site is > http://www.ngs.noaa.gov/cgi-bin/ds_radius.prl > Took me less than 5 min to find it via Google. > Don
The USGS also makes good topo maps and now they have all those maps scanned at full resolution and on-line. (Googlle will find them.) THe makes are very large scale and show all the benchmarks, section markers and so on. All of them were ground checked too. The maps tells you if the benchmark is in a reasonable place before you go and look. For example the one nearest me is on the center of a four lane road with much traffic. I hear that there is a hobby where people photograph these and collect the photos. Seems pointless in the city but many are on mountain peaks and other places with good views. The hobby is more reasonable if you find them without using GPS. The USGS maps are good enough o put you within 10 to 20 feet of the BM without using a GPS. Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
