Tag:marker=aerial

Aerial markers can be clearly identified from aircraft inspecting the surroundings of an underground infrastructure like pipelines or main high voltage cables.

They are designed with a large cover displaying clear reference to the representative colour of the utility they refer to (yellow for gas, red for power and so on)

Examples

Oil & Gas

Photo	Location	Tagging	Note
	France	marker=aerial utility=gas colour=yellow operator=GRTgaz ref=74A	A big yellow marker warning about the presence of a high pressure gas  pipeline buried nearby
	Belgium	marker=aerial utility=oil colour=orange operator=Total ref=9.9	An orange aerial marker for Total pipeline network in Belgium  pipeline buried nearby
	France	marker=aerial utility=gas colour=yellow barrier=stile operator=GRTgaz ref=359	An aerial marker supported by a  stile attached to a narrow ladder helping people crossing fences
	France	marker=aerial utility=chemical operator=Elf Antar France ref=PK 373.300 phone=04 78 70 30 30	An aerial marker indicating the presence of an  ethylene pipeline buried below. At right, a  cathodic protection marker
	France	marker=aerial utility=oil operator=SPSE ref=PK 400.934 phone=04 42 05 01 64	An aerial marker indicating the presence of a  hydrocarbon pipeline buried below. At right, a pedestal marker
	Italy	marker=aerial utility=gas colour=orange	An aerial marker indicating the presence of a gas pipeline buried below.
	UK	marker=aerial utility=gas colour=red and whitematerial=plastic	The standard UK aerial gas marker usually lacks a hat but makes up for this by being 2m tall and quite thick. Although post-shaped, it is tagged as an aerial marker (rather than a post marker), even though it is post-like, for two reasons: (1) it is designed to be visible from the air, and (2) the smaller non-aerial gas markers are already commonly/usually referred to as marker posts in the UK. The "material=plastic" is somewhat redundant as all aerial markers in the UK are plastic. However, since most UK utility markers are either made of concrete or plastic, it does no harm to add this attribute.
	UK	marker=aerial utility=oil	The standard UK aerial oil markers usually have a hat, but colours can vary considerably depending on the operator of the pipeline. Sometimes the hat is flourescent pink. Sometimes white. Sometimes black with a yellow stripe or yellow with a black stripe. The image left shows a GPSS pre World War II white marker, with post World War II yellow/black roofed aerial marker post beside it.

Power

Photo	Location	Tagging	Note
	France	marker=aerial utility=power colour=red	An aerial marker indicating the presence of high voltage cable buried below

Telecom

Photo	Location	Tagging	Note
	France	marker=aerial utility=telecom colour=yellow operator=France Télécom ref=1/1 phone=05 21 68 97	An aerial marker indicating the presence of an  optical fibre cable buried below