Interesting article in BBC News about the survey of Great Britain.
Wonderful photos and a rich surveying history in my old motherland. Thanks for sharing.
Just because I'm paranoid, doesn't mean they aren't out to get me.
Wonder if they had named the Hotine Oblique Mercator projection after Brigadier Martin Hotine ?
For those mathematically inclined, Hotine's Mathematical Geodesy is available on-line at: https://archive.org/stream/mathematicalgeod00hoti#page/n5/mode/2up
BTW, see this example of a South Texas pillar monument:
https://picasaweb.google.com/106803290884381691323/MissionAransasNERR#5236227289684171586
The design and construction was performed by the NERRS staff (part of NOAA) and was intended more as a PR exercise than for surveying. It does have a high accuracy position. Datasheet is: http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=DK7860
I'm an occasional Trigpointer! trigpointing.uk
Wished we had the OPUS system in the UK though.
wilba, post: 368697, member: 9024 wrote: I'm an occasional Trigpointer! trigpointing.uk
Wished we had the OPUS system in the UK though.
I hope you are aware of other automated processing tools. Some I've used at linked here:
It is my understanding that OPUS positions cannot be provided for points in some countries due to their failure to agree with such a service being provided there.
HTH,
DMM
BTW, came across some surveying pillars in the vicinity of the Sydney Opera House. See: https://picasaweb.google.com/106803290884381691323/GeodesyRelated#5212878396094071282
While on a hiking trip in Ireland more than a few years ago, I did happen to come across some of the Ordnance Survey pillars on some coastal islands with great views.
Pillars are great. I really admire the UK for having established those.
Many (most) of the 39 USACE dams we monitor have pillars. I started out surveying at the USACE 35 years ago on these projects, and I thought pillars were normal!
I have a pair on my property, which I have posted photos of before, which I use for testing, calibration, etc.
I found a survey pillar while wandering alleys in Cairo, Egypt. I thought I had a picture of that, but cannot find it.
I used a nice one in Canada last year.
It had a BM on the side
and also a steel loop on the other side to lock equipment to
South Africa has great trig network, and whilst it has been replaced some what by VRS , I still use it daily to resect off. Nothing like coming off two dropped in GPS points and two trig beacons to tighten the solution up and know you have got a great fix.
Here are some of the trig beacons my brother and I have visited. You can see many cool shots on Instagram using the #trigbeacon.
Here is one from yesterday's job site
