Trig points ... according to
http://www.icsm.gov.au/mapping/surveying1.html#jargon_trig
all the trig points have a benchmark under them.
Suppose that makes sense in that if the trig point were damaged in a store then
it can be easily re-established.
On 23-Nov-17 03:04 PM, Mark Wagner wrote:
On Thu, 23 Nov 2017 09:25:52 +1100
Warin <61sundow...@gmail.com> wrote:
On 21-Nov-17 04:12 PM, Graeme Fitzpatrick wrote:
On 21 November 2017 at 12:48, Andrew Harvey
<andrew.harv...@gmail.com <mailto:andrew.harv...@gmail.com>> wrote:
I'm not sure, I've only seen two types the brass disk in the
footpath, gutter, road etc. and the rock or cement pillar with a
plate on top, sometimes with a black mental circle which can be
seen from a distance. Your proposed tags provides a way to
distinguish these.
Sometimes slight variation in that the disk has been set into a
concrete block on a hill etc, but the same for mapping purposes.
I am reminded of Cameron's Corner where a concrete pillar has been
erected with a large brass plaque on to reporting it as the junction
of 3 Australian states.
In fact this is a tourist attraction and not the true survey mark.
The true survey mark was subject to vandalism/souvenir and has been
hidden to prevent further costs.
For this reason I would support not rendering benchmarks.
Most survey marks are not of interest to anybody other than surveyors,
much less tourists seeking to take them as souvenirs. There are only a
few places such as Cameron's Corner, or Four Corners in the US, where
theft would be a problem.
If anyone wants to steal a National Geodetic Survey marker, the NGS
website provides a complete map of them at
https://www.ngs.noaa.gov/NGSDataExplorer/
With enough effort you can find where survery marks/trig points are in mot
places.
Trig points are usefull on a map - even an OSM one - as people still use a map
and compass as a fail safe.
Bench marks are far less usefull to most people, I use them to improve the map
accuracy.
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