Thank you for you comments, Warin. Please see my discussion inserted below.
Wed, 7 Mar 2018 08:48:22 +1100 From: Warin <61sundow...@gmail.com> > The obstacle is not the light, but the light is used to mark it. > Perhaps air_obstacle=tower/line (thinking of power and communication > lines as well as towers) > If you want to identify air obstacles, if you only want to identify > those obstacles that have identifiers then You are right, the light is not the obstacle. However, I am not trying to tag nor identify all the obstacles. All the obstacles are already defined in OSM as man_made=tower, man_made=mast, man_made=chimney, building=* etc. I would just like to tag the warning light on the obstacle - that is the scope of the proposal. A previous proposal some years ago tried to identify the man_made features as aviation obstacles, but it met considerable resistance and failed. > Some of these have lights, some have no lights. Some lines have soccer > ball things in bright colours. > For that maybe airmark:light=yes/flashing_red/* airmark:ball=red/* Correct, many obstacles are required to be marked with paint for daylight identification, typically aviation red/white horizontal stripes. Power lines across gorges may be required to have "soccer balls". However, in this proposal I only focus on the lights. > conditional tagging could be used .. > light_source:conditional=high intensity flashing white > light@sunrise-sunset:low intensity flashing red light@sunset-sunrise > https://wiki.openstreetmap.org/wiki/Conditional_restrictions Yes, I am sure this approach would be possible. However, combining all the various attributes (colour, intensity, character, day/night, ICAO type, multiple) into one line would lead to a complicated syntax without any error checking in the editors and with a high probability of getting it wrong. For certain obstacles, such as light masts around a stadium, it would be necessary to use the light tag for the main (flood)light on the mast and the obstacle_light tag (or airmark:light tag) for the (flashing red) warning light on top of the mast. Also, all the obstacles close to the sea already have a defined scheme for tagging the various light attributes in the seamark:light feature, which I try to build on in the proposal.
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