FrancisH, post: 420324, member: 10211 wrote: No messing around with geoidal height separations etc. Assuming you want orthometric heights, which is w...

Jim Frame, post: 420225, member: 10 wrote: for small areas the inconcentricity between the geoid and the ellipsoid may be too small to matter For my ...

Jim Frame, post: 420225, member: 10 wrote: for small areas Just as, for small areas, 10000, 10000, 100 works well. If you use ellipsoidal heights th...

GeeOddMike, post: 420075, member: 677 wrote: Unfortunately many submitters to NGS like to supercede these stability codes thinking their poured-in pla...

What application calls for such flatness?

RADAR, post: 419687, member: 413 wrote: Those crews have to turn engineering garbage into something that actually fits and flows. Those 3-foot tall cu...

Bill93, post: 419692, member: 87 wrote: the true elevation difference between marks still has a standard deviation of 1 unit. Oops - I didn't say tha...

FrancisH, post: 419618, member: 10211 wrote: how can you have 1st order closures and not have 1st order accuracies? if your forward and backward runs ...

FrancisH, post: 419620, member: 10211 wrote: the error brought about by just levelling your base/rover setups and getting your HI using a tape would i...

I've complained before about the 1950's plats our church is on (straddles two subdivisions by same owner). Usually there is a curve table with enough ...

Some years ago I was out at the edge of a several-acre empty lot a block from my house, sighting to the red lights on towers to put in my practice net...

I was surprised by the density of stations, the majority of which don't show up via OPUS. Around here OPUS seems to access only the Iowa DOT network ...

imaudigger, post: 419310, member: 7286 wrote: It's likely the alum. cap was shielding the small footprint of a signal the vertical re-bar was giving o...

Jim Frame, post: 419109, member: 10 wrote: Now it's dead silent until it's right over a rebar. I know you like to tinker. Before giving up on it, yo...

You get maximum sensitivity if you set the tone in the medium frequency range and listen for subtle changes. Other posts have indirectly suggested th...

Jim Frame, post: 418866, member: 10 wrote: My GTS-302 hasn't seen the light of day for about 6 years now. I guess I ought to charge it up and make sur...

Robert Hill, post: 418797, member: 378 wrote: Stargazers Stone by Mason/Dixon that was used to fix the lat/long on the Mason Dixon Line.I believe it i...

I tried to get in, but I guess I'm going to have to break down and upgrade my technology. The home internet service isn't fast enough and the old lap...