On Mon, Jul 11, 2011 at 9:33 PM, John Smith <deltafoxtrot...@gmail.com> wrote: > On 11 July 2011 21:24, Franc Carter <franc.car...@gmail.com> wrote: >> On Mon, Jul 11, 2011 at 9:19 PM, John Smith <deltafoxtrot...@gmail.com> >> wrote: >>> >>> Has anyone been tagging these from Nearmap imagery or even on the ground? >> >> I'd like to knwo how to recognise/nterpret them - seems very useful to have >> a point we know to higher accuracy > > They're not hard to spot, I've seen them from residential areas to > along highways: > > http://www.nearmap.com/?ll=-23.585605,148.825851&z=21&t=k&nmd=20110505
Seeming I'm interested in the tagging of such features and it seems there is no or little existing clear usage, I'm putting forward my ideas/thoughts. I'm trying to keep in line with http://www.lpma.nsw.gov.au/survey_and_maps/scims_online/glossary and existing tags. So we keep man_made=survey_point, but we also add additional, survey_point:type=mapping_control_point survey_point:type=cadastral_reference_mark survey_point:type=geodetic_bench_mark survey_point:type=miscellaneous_survey_mark survey_point:type=permanent_mark survey_point:type=state_survey_mark survey_point:type=trigonometrical_station I used :type in case we want to add other :foo's to survey_point, but it could be omitted, I don't care so long as it is consistent and non-ambiguous. mapping_control_point would be your marks used as ground control points (GCPs) you see from aerial imagery. (wiki currently has aerial=yes) state_survey_mark would be the 50mm diameter plates with a dot in the middle found in footpaths/gutters, etc. trigonometrical_station would be the ones with stone pillars which you can place survey equipment on top of, which sometimes also have a big black circle on top. I'm guessing geodetic_bench_mark would be a mark used to monitor plate movement, etc..? I'm guessing cadastral_reference_mark would be a white peg or something a surveyor put in the ground to mark land boundaries? For now I'm using ref:ssm=#### to store the id number of the state survey mark. Thoughts? _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
