merc_location_to_tile_coords seems to produce incorrect tile position

[woelper]

To me it seems that merc_location_to_tile_coords with zoom values other than 8 produces incorrect positions inside a tile. For example

let paris = (48.864716, 2.349014);

let latlon = slippy_map_tiles::LatLon::new(paris.0 as f32, paris.1 as f32)
    .unwrap()
    .to_3857();

info!("3857 {:?}", latlon);
// 3857 (261491.05, 6251937.5)
// This seems to be the correct 3857 location

let tile_coord =
    slippy_map_tiles::merc_location_to_tile_coords(latlon.0 as f64, latlon.1 as f64, 8);
info!("pos {:?}", tile_coord);
// pos ((129, 167), (171, 14))
// this is the correct location within this tile at zoom 8

with a zoom of 10, pos becomes:
pos ((518, 671), (174, 830)), which given a 256x256 image, is out of bounds. Lower values than 8 seem to work correctly on the x axis but leave y at zero, zoom 4:
pos ((8, 10), (26, 0))

It could be entirely possible that I am using the library incorrectly - if so, sorry in advance!

[amandasaurus]

thanks for your feedback. I'm a little busy right now, so I haven't had any time to properly look at this yet.

…

On Sun, 13 Dec 2020 21:20, Johann Woelper ***@***.***> wrote: To me it seems that `merc_location_to_tile_coords` with zoom values other than `8` produces incorrect positions inside a tile. For example `let paris = (48.864716, 2.349014); let latlon = slippy_map_tiles::LatLon::new(paris.0 as f32, paris.1 as f32) .unwrap() .to_3857(); info!("3857 {:?}", latlon); // 3857 (261491.05, 6251937.5) // This seems to be the correct 3857 location let tile_coord = slippy_map_tiles::merc_location_to_tile_coords(latlon.0 as f64, latlon.1 as f64, 8); info!("pos {:?}", tile_coord); // pos ((129, 167), (171, 14)) // this is the correct location within this tile at zoom 8 ` with a zoom of `10`, pos becomes: `pos ((518, 671), (174, 830))`, which given a 256x256 image, is out of bounds. Lower values than `8` seem to work correctly on the x axis but leave y at zero, zoom 4: `pos ((8, 10), (26, 0))` It could be entirely possible that I am using the library incorrectly - if so, sorry in advance! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#4>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAAMC4Z3QKOFW5RDZ5JKHLSUUO2HANCNFSM4UZYKFCA>.