Some tiles cannot be read. The server returns 204 with no content

[fandy00123]

Hi,
When I use martin(v0.11.2) as tile sverer in windows 10, martin-main\tests\fixtures\mbtiles\world_cities.mbtiles as datasource, use martin world_cicties.mbtiles command, I found some tiles cannot be read.

• http://127.0.0.1:3000/world_cities/5/6/19 server return 204 No Content
• http://127.0.0.1:3000/world_cities/5/9/19 server return 200 can download a tile file

I use my mbitiles only zxy000 can read, I modified the zxy of the tiles to 000 and they can be read
I use other vector tile datasouce also. in my mbtiles

Looking forward to your answer!

tiles.zip

[nyurik]

This is by design, the 5/6/19 does not exist in that file. If you inspect the file (i did it on linux, so adjust the file path):

sqlite3 tests/fixtures/mbtiles/world_cities.mbtiles 'select * from tiles where zoom_level=5 and tile_column=6'
5|6|19|

You see the 5|6|19 but the row (Y value) is NOT 19 because MBTiles uses inverted Y values. To get the right value, use (2 ^ zoom) - 1 - Y, so for this case its 2^5-1-19 = 12. Try getting http://127.0.0.1:3000/world_cities/5/6/12 and it should work.