openstreetmap / openstreetmap/mod_tile
Higher zoom levels (up to e.g. 28)
Nobody has claimed this yet.
- Dominant language
- C++
- Stars
- 318
- Forks
- 199
- PR merge metrics
- No merged PRs in 30d
Description
Would there ever be an appetite for optionally supporting zoom levels > 20? The changes to support it are here:
https://github.com/openstreetmap/mod_tile/compare/master...SomeoneElseOSM:mod_tile:zoom2022
although it's not something that it would make sense to turn on by default because the metatile path isn't compatible with existing metatiles, and many people wouldn't want to lose that cache.
I've been running a version of that code for 8 years or so and haven't really found any drawbacks, provided that the "tile dirtying after update" logic has sensible settings. Extra disk usage hasn't really been a problem; people tend on to zoom in that far and pan around.
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked zoom2022 comparison, then inspect the metatile path and tile-dirtying logic it changes. Done would mean defining an optional way to support zoom levels above 20 without invalidating existing metatiles or requiring unwanted cache loss.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- backend
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100