[time-nuts] Averaging Location for Position Hold
hmurray at megapathdsl.net
Wed Sep 14 05:47:40 UTC 2011
> 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.
I'm in Menlo Park. The USGS has a big office complex here. That includes a
bench mark just outside the front door of the main public building (map
sales, talks, bureaucrats, ...). There may be a better one out near the
flagpole. (It's out of the shadow/multipath of the building.)
I'd expect there would be an on-line database of that sort of thing. Anybody
know a good URL?
Google blundered into this, but I haven't checked much:
They have lots of records that aren't interesting but also a category of "US
Benchmarks" that may be an interesting subset.
While hiking, I've seen benchmarks by CA Highways (I think) so "USGS" may be
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