Nice presentation plenty of graphics on airport obstruction charting here:

Just trying to understand. So I buy an after-market GNSS receiver providing me an autonomous (?) position of the antenna at the few centimeter level. ...

I don't know whether this is relevant but the FAA document describing obstructions to navigable airspaces is here: See section 2.

Finally getting around to reading the presentations. Professor Jekeli's is excellent and is understandable without a lot of maths background. Lots of ...

On the issue of the proposed "Foundation CORS" a closer look at the NGS site yielded this: On the issue of California subsidence, I always liked this ...

While in no way do I speak for NGS, their management of the CORS network is constrained by resources, the reliance on the good behavior of participant...

I don't know if it is of any help by the work was level project L20408. You can use this project identifier to retrieve datasheets for all the point w...

The link is to the description card for a surveying instrument display at the National Maritume Museum in London. If the link does not work it quotes...

FWIW, the issue of adopting an ITRF-based datum in the US was discussed by the US NGS back in 1997. See this report: For me, the shift from relative ...

Loyal, post: 385223, member: 228 wrote: Actually the readout was nixi-tubes not LED(s).I still have a AGA 78 (in the truck), and there might still be ...

I used th AGA Geodimeter Model 76. back in 1974. Visible beam, LEDs, decent range, fiddly controls (set and return). So futuristic at the time.

Perhaps a more supportable answer is to increase scrutiny of work and greater financial penalties for malpractice? Expanding a license requirement to ...

Howdy,Enjoyed your article. Good summary and tabulation. In some ways, the hardest part of modern surveying is keeping track of what each number means...

Iceman, post: 381905, member: 579 wrote: I never used the Wild T0,but the Wild T1-A was my everyday transit.Reading stadia with inverted image.I also ...

You can also review research. When using OPUS you need to verify he quality of the solutions using the guidance linked from the site. One recommended ...

FWIW, when using any of the sutomated processing tools be sure to keep track of reference frames and epochs. A rather dated example of comparisons bet...

FWIW,You might want to take a look at the approach in the venerable TRIMNET Users Manual available here:

Looking at eBay I found this: This is a disk with a date but the stamping was probably sanded off. It was obviously set in concrete as the pictures sh...

FWIW,While in the past there were big problems with a lack of redundancy, it seem now that some add redundancy that does not contribute significantly ...