Preset for vehicle holding tank disposal sites

[brycenesbitt]

These are presets for a place to empty a toilet holding tank. This is a common campground and marina feature, though only 800 or so are mapped so far.

Background is at http://wiki.openstreetmap.org/wiki/Toilet_Holding_Tank_Disposal
and http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dsanitary_dump_station

Icons are in the pull request at gravitystorm/openstreetmap-carto#1466

amenity/sanitary_dump_station.json
{
    "fields": [
      "fee",
      "access",
      "operator",
      "water_point",
    ],
    "geometry": [
        "point"
    ],
    "terms": [
        "RV",
        "Motorhome",
        "Dump Station",
        "Elsan Point",
        "CDP",
        "CTDP",
        "Chemical Toilet Disposal Point",
        "Toilet Dump",
    ],
    "tags": {
        "amenity": "sanitary_dump_station"
    },
    "name": "Toilet Holding Tank Disposal for Motorhomes"
}

tourism/caravan_site.json
{
    "fields": [
        "sanitary_dump_station",  /* yes or no or customers */
    ],
}

waterway/sanitary_dump_station.json
{
    "terms": [
        "Pumpout",
        "Pump-out",
        "Pump out",
        "Elsan Point",
        "CDP",
        "CTDP",
        "Chemical Toilet Disposal Point",
        "Boat",
        "Watercraft",
    ],
    "tags": {
        "waterway": "sanitary_dump_station"
    },
    "name": "Toilet Holding Tank Disposal for Boats and other Watercraft"
}

At an attribute of a place, sanitary_dump_station can be set to yes/no or customers.

Except in arid areas, a "water_point" is integrated into such stations for filling fresh water holding tanks, and/or flushing the system. water_point is thus yes or no.

Note that for marine facilities the value pump-out exists as a value for seamark:small_craft_facility.

[brycenesbitt]

Note JOSM additionally adds sanitary_dump_station=yes/no to presets for
amenity=marina, amenity=caravan_site and amenity=camp_site.
This is particularly useful when the facility is known to offer the feature, but the exact location is unknwon to the mapper.