id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
21318	MVT style drops data when two points have same coordinates	rob.j.nickerson@…	team	"I have set up a postcode layer and am using this in JOSM via the MVT option. A user has pointed out that when two postcodes have the exact same location, JOSM is only rendering one of them. This could lead to improper mapping. Expected behaviour: show both as is the case in the PNG tile layer I am also providing.

Example location:
 51.494328 -0.212871; W14 0QR; W14 0QL; Llewellyn Mansions, Hammersmith Road and 125 Hammersmith Road.

MVT layer:
https://api.mapbox.com/v4/robjn.3uur23nz/{zoom}/{x}/{y}.mvt?access_token=pk.eyJ1Ijoicm9iam4iLCJhIjoid0dYNkY1QSJ9.A-0lzQOawGYICYPfURsjDA

MVT style JSON:
See https://www.openstreetmap.org/user/RobJN/diary/397365

MVT tile the above example appears in shows that it is not an issue in the source data as both postcodes appear within the tile data:
https://api.mapbox.com/v4/robjn.3uur23nz/13/4091/2724.mvt?access_token=pk.eyJ1Ijoicm9iam4iLCJhIjoid0dYNkY1QSJ9.A-0lzQOawGYICYPfURsjDA

PNG raster tile layer (JOSM WMTS):
https://api.mapbox.com/styles/v1/robjn/ckt38gru202nd18labo5bzds4/wmts?access_token=pk.eyJ1Ijoicm9iam4iLCJhIjoid0dYNkY1QSJ9.A-0lzQOawGYICYPfURsjDA&request=GetCapabilities

P.S In the raster tile layer the postcodes are just rendered on top of each other. Whilst this makes readability hard, it does at least show the OSM mapper than there is a conflict here to review. In QGIS the postcode labels are placed one above the other when I pass it the MVT data converted to geojson."	defect	new	normal		Core imagery			mvt mapbox vector tile	taylor.smock