BTW if you have any details to add on the relevance of trig points to OSM then please do add to https://wiki.openstreetmap.org/wiki/Ordnance_Survey_triangulation_stations
On Wed, Oct 9, 2019 at 2:41 PM Simon Ritchie <[email protected]> wrote: > The real question, really, is why you're aiming for that level of precision > > > That's what the emerging equipment does. I'm just planning on showing how > it can be put together, but I'd like to be able to say with confidence that > it works properly. > > As to who will use it, there's the readers of this forum, or some of them, > and surveyors and architects, of course. There's also archaeologists, > because they are required to log where they find objects, and they use GPS > trackers to do it. They often leave objects in the ground to protect them, > and then come back a few years later to have another look using new > techniques. It would be nice if they knew precisely where their target is. > They would only have to dig a small hole to find it. > > I note your point about plate techtonics. My local archaeology group > recently re-excavated a site that was first excavated a hundred years > earlier. The records they had turned out to be quite misleading. That was > due to poor record keeping, but I guess over that time, the UK might have > moved around a bit. I recall that one end is rising and the other is > sinking. > > However, when new equipment comes along, people find new uses for it. We > moved house a few years ago and I saw our Land Registry documents. I was > quite surprised at the rudimentary map that is the legal definition of our > property. I'm supposed to resolve a boundary dispute with this? Now that > land is so valuable, I can see people demanding better, so the estate agent > will walk around the boundary with a GPS device and the result will be > logged with your land registry records. > > In the future I can also see architects putting GPS coordinates on plans, > and builders using accurate GPS devices to do the initial layout of the > site. At 2 cm accuracy, they will probably have to tweak the positions > using better instruments, but if GPS speeds up the process or makes it more > reliable, they will use it. > . > >> Relative accuracy (i.e. consistency of measured points >> within a reasonably sized area) is much easier to achieve than >> absolute accuracy (which is not even an especially well-defined >> concept in this case). >> > > Given the inaccuracy of the trig point locations, I can't even do that :( > > Regards, Simon > _______________________________________________ > Talk-GB mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/talk-gb >
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