Lost Wedding RingIf I really wanted it I guess I could have gone out there with a sieve and tried to find it. I did try some, but it wasn't terribly v...

You can't be serious. That is an embarrassment. I saw a youtube video yesterday from magellan Professinal:What is WGS84?In it, they say that NAD83 is ...

Excellent article, Jerry. It is obvious that you put a lot of time into researching this.

We had a farmer near where I grew up who would shoot salt out of a shotgun at kids trespassing. Never got me, but I was told it burned pretty good but...

When I first started in GPS (1986), we were doing a countywide bluebook project in VA. All the obs were at night. We had an aussie working on the crew...

Yes, it is long gone. But, that is what the City of Pittsburgh used as its primary benchmark to start all of the leveling. The is actually a stable ma...

Jim: to me static is static. In trimble speak, fast static is under 15 km, under 20 minutes of data. In the old single frequency days, that would not ...

I am very leery of ever entering posted land. Over 30 years of doing photo control (probably in excess of 30,000 points in 50 states) I have probably ...

Wow. That is scary...from a photo control standpoint it is often difficult to determine who owns land, or to get in touch with them once you are out i...

The City of Pittsburgh benchmark network is based on the 1912 adjustment (Sandy Hook datum?). I doubt many people know or understand this, they just t...

I have gone by the "15 minutes plus 1 min per kilometer over 15 km" rule of thumb for a long time. Works very well.

The one thing I don't like about it is that Verizon made me get a 5 GB stand alone plan at $50/month. I can not share the 10 GB I have otherwise. I th...

WAASI believe it is a MISUSE of the state plane coordinate systems to use them on anything other than NAD83 or NAD27. Yes, they certainly can be used ...

I recently did some work where there were 2 VRS system, one a Trimble and the other a Leica. On some points I used both, and the results were similar ...

Can you beg/borrow/steal another tripod? Using three tripods and swapping the instrument/prism each time will eliminate any centering error. Get toget...

Ultra rapid vs Rapidcompare the WAAS positions against the ITRF position on the OPUS output. It is only given in XYZ or lat/long/height, not UTM, so y...

I am not a VRS operator, but my understanding is that it uses the CORS (the ones in the system, not necessarily the same ones available to OPUS) surro...

Ultra rapid vs RapidWAAS is the opposite of "autonomous". WAAS uses corrections determined at a network of base stations (usually at FAA ATC facilitie...

Actually, I have wondered the same. If I go out in a VRS coverage area, it will typically initialize in 10-20 seconds if I have both GPS and Glonass. ...