That depends on what you mean by "accurate." If you mean that they agree with everything in town, it's probably because the Town Datum is based on th...

@holy-cow Yup! Ward Bond and Claude Akins were also significant characters in the plot (but limited screen times). There is a great comment in the fi...

Right on Shelby! Back in the day, I had a phone number for THE USGS GUY in Denver who I could call to get copies of the USGS Bench Mark Data. As I re...

Speaking of Dean Martin, the youngsters will probably have to google the other three guys in this clip too!

About a half a century ago I worked with a RLS who was also had a Federal Blasters License (or some such thing, he was the USFS guy who blew up whatev...

@rkinnie Absolutely true! At least in the vast majority of cases. U.S.G.S Bench Marks, not so much (unless they were incorporated into later USC&...

Probably in a dusty filing cabinet in the basement. I don't think that these documents were ever scanned into a digital format, but I could be wrong (...

@placerlode Excellent, Thanks! 1 down

@gene-kooper Thanks buddy, no real rush at this end.

Gene, Do you have the "Connection Diagram" (aka District Sheet) for this area? How about the Patents? Yeah...I'm needy! Loyal

93.34286063058036 feet per lot, although 93.343 would probably just as silly. That should keep the GIS department happy. Seriously though, I agree w...

Actually it assumed a normal gravity scenario where Latitude Difference AND Leveled DIFFERENCE along a given line defined the Orthometric Correction f...

@john-nolton Thanks John! Are they letting you into Big Nose Kate's??? ????

While the Master Title Plats and Historical Indexes are an important resource, they are sometimes less than "accurate." Most issues concerning apparen...

As I recall there was a "geoid map" relating to NAVD/NGVD-29 that John Hamilton has posted at some point. I ASSUME that it was based on whatever gravi...

I agree with John, this is good news for sure. Although most folks don't seem to realize it, if you use OPUS (any flavor), you are using HTDP (behind ...

Those are always really cool! I believe that the requirement to mark the common Corner of Sections 15,16,21 and 22 with the Township and Range began w...

Ignorance is like a virus, it spreads and it mutates. Even if procedures start out reasonably good, short cuts here and there degrade things really fa...

While 500+ ppm is quite a bit, it's certainly possible here in the Mountain West (especially in West-Central Montana w/ its Single Zone Lambert), it I...