Even at the same spatial dimension, variable resolution tiles might be necessary.
Rationale is that bathymetry data in terrarium tiles appear to be present only up to ZL 10.
Meaning that, even if sticking to the same spatial tile size is desired, seas should be covered with ZL10 tiles split up.
Alternate approach: combine data from ZL10 tiles with bathymetry (possibly resampling it) into higher ZL tiles.
While suboptimal, it seems the only way near the coastline, as higher ZL tiles seem pretty cut around the coastline
Even at the same spatial dimension, variable resolution tiles might be necessary. Rationale is that bathymetry data in terrarium tiles appear to be present only up to ZL 10. Meaning that, even if sticking to the same spatial tile size is desired, seas should be covered with ZL10 tiles split up.
Alternate approach: combine data from ZL10 tiles with bathymetry (possibly resampling it) into higher ZL tiles. While suboptimal, it seems the only way near the coastline, as higher ZL tiles seem pretty cut around the coastline