Wrong scheme? (TMS Shows nothing, XYZ works)

[wslaghekke]

Im trying to use martin with some Dutch public data in EPSG 28992 but when adding it to the map i get no data.
After some troubleshouting i got it to work by changing the scheme in the tilejson from TMS to XYZ.
Am i doing something wrong, or could this actually be different, and if so, should this be configurable?

[stepankuzmin]

Hi @wslaghekke! Thanks for posting this. Could you please run martin in debug mode and post Postgres queries that martin produces here?

[wslaghekke]

I cant easily share the query without revealing personal information (im testing with my home town), but ive run the url that mapbox-gl-js requests through tilebbox function from https://github.com/mapbox/postgis-vt-util/blob/master/src/TileBBox.sql.
When i used the tileJson as generated by martin (which is TMS) the resulting bounding box (converted to WGS84) is coordinates 6 and -52, but its supposed to be 6 and 52.
I'm not sure if maybe this is related to reprojection, as i dont have a great understanding of GIS, but when i changed the tileJson to xyz the resulting layer worked correctly.

Hope that is enough information, if its not, i can try to generate some more dat in other locations in the netherlands.

[shaunakv1]

Hi @stepankuzmin

I can confirm this bug. Essentially by default (no configuration provided) the scheme that is coming out should be "scheme": "xyz" and its coming out to be "scheme": "tms"

You can check a live example here

https://codesandbox.io/s/hurricanes-tracks-using-mapbox-gl-with-geocoder-it3m3 (https://codesandbox.io/s/hurricanes-tracks-using-mapbox-gl-with-geocoder-it3m3)

Notice that source has tms scheme but it works fine when I override it in mapbox api as xyz

[robert-claypool]

I am also getting negative latitudes (y coordinate) when I need positive. Here's the generated SQL, reformatted but unchanged:

WITH bounds AS (
  SELECT
    ST_MakeEnvelope(
       -10390543.875527343
      ,-6212801.658154298
      ,-10380759.935908202
      ,-6222585.597773438
      ,3857
    ) as mercator,
    ST_MakeEnvelope(
       -10390543.875527343
      ,-6212801.658154298
      ,-10380759.935908202
      ,-6222585.597773438
      ,3857
    ) as original
)
SELECT
  ST_AsMVT(
     tile
    ,'public.switches'
    ,4096
    ,'geom'
  )
FROM (
  SELECT
    ST_AsMVTGeom(
      shape
     ,bounds.mercator
     ,4096
     ,64
     ,true
   ) AS geom
   ,"objectid"
   ,"description"
  FROM public.switches, bounds
  WHERE shape && bounds.original
)
AS tile
WHERE geom IS NOT NULL;

[stepankuzmin]

Thanks for posting this! I'll dig into it as soon as I have time.

[robert-claypool]

Thank you too!

It's a blocker for me, so if you know how to patch it but just don't have the time, let me know and I'll try to issue a PR.

[stepankuzmin]

Fixed in v0.5.0. TileJSON scheme is now xyz by default.