[Tagging] MAST RELATION

[Mateusz Konieczny]

I would encourage typing like this, NOT LIKE THIS IN UPPERCASE

Mar 6, 2025, 21:11 by tagging at openstreetmap.org:

> HELLO EVERYONE. I WOULD LIKE TO GET SOME THOUGHTS ON AN EARLY BRAINSTORM OF A MAST RELATION. PLEASE SEE MY INITIAL THOUGHTS BELOW AND I WELCOME ANY ADDITION, FEEDBACK, SUGGESTIONS, ETC.
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> MAST RELATION
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> MAST RELATIONS AREUSED TO CONVEY MULTIPLE ELEMENTS THAT EXIST ON A SINGLE MAST OR BETWEEN TWO MASTS SUCH ASMULTIPLE STREET SIGNS ON A SINGLE POST OR A LARGE TELECOMMUNICATIONSTOWER WITH MULTIPLE TYPES AND SIZES OF EQUIPMENT, OR A FLAGPOLE WITHMULTIPLE FLAGS.
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> EACH  ELEMENT SHOULDBE TAGGED AS A NODE WHERE THEY ARE IN THE WORLD, EVEN IF THAT MEANSOVERLAPPING NODES. EACH ELEMENT SHOULD BE TAGGED IN THE RELATION WITHAN EMPTY ROLE, IN ORDER OF FURTHEST AWAY FROM THE GROUND TO THECLOSEST TO THE GROUND AND FROM THE FURTHEST AWAY FROM THE CENTER TOTHE CLOSEST TO THE CENTER. SUCH RELATION ORDERING IS COMMONLY USED INROUTE RELATIONS AND WILL APPLY TO MAST RELATIONS AS WELL.
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> FOR EXAMPLE, IF ASTOP SIGN IS BELOW A STREET SIGN IN THE UNITED STATES, BUT THEY SHAREA POLE, THE TAGGING WOULD BE:
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> RELATION
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> `TYPE=MAST`
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> STREET SIGN
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> `TRAFFIC_SIGN=US:D3-1[MAIN STREET]`
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> STOP SIGN
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> `TRAFFIC_SIGN=US:R1-1`
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> IN THE ORDER OFSTREET SIGN, STOP SIGN.
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> THIS RELATION CANALSO BE USED FOR THINGS LIKE SIGNS OR CAMERAS THAT SHARE A POST WITHA UTILITY WIRE, LARGE ADVERTISING BILLBOARDS WITH SIGNS FACINGMULTIPLE DIRECTIONS, AND FLAGPOLES WITH MULTIPLE FLAGS.
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> WITH REGARD TOSTREET LIGHTS ON WIRES, THIS SHOULD BE TREATED THE SAME AS BUS ROUTESTHAT ARE NOT A LOOP, WHERE 3 RELATIONS ARE NECESSARY. ONE FROM THEPERSPECTIVE OF EACH POLE, AND AN OVERALL MAST RELATION TO HOUSE BOTH(OR ALL) RELATIONS ON THE LINE.
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> THE USE OF HEIGHTAND LAYER IS ENCOURAGED BUT NOT REQUIRED. IF A WIRE IS USED ASDESCRIBED ABOVE, THE WIRE ITSELF SHOULD BE PART OF THE RELATION ASWELL, JUST AS WAYS ARE A PART OF A BUS ROUTE.
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> IDEALLY, ELEMENTSCAN BE ADDED TO THE RELATION WITHOUT A CORRESPONDING NODE, TO BEPLACED IN THE SAME COORDINATE AS THE RELATION IN THE DATABASE. THIS,TO MY KNOWLEDGE, IS NOT A CAPABILITY OPENSTREETMAP HAS AS OF WRITING.
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