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add media type note

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Brandon Liu
2022-02-26 14:19:47 +08:00
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@@ -73,6 +73,7 @@ An entry consists of:
* A PMTiles archive with less than 21,845 tiles should have a root directory and no leaf directories. * A PMTiles archive with less than 21,845 tiles should have a root directory and no leaf directories.
* Multiple tile entries can point to the same offset; this is useful for de-duplicating certain tiles, such as an empty "ocean" tile. * Multiple tile entries can point to the same offset; this is useful for de-duplicating certain tiles, such as an empty "ocean" tile.
* Analogously, multiple leaf directory entries can point to the same offset; this can avoid inefficiently-packed small leaf directories. * Analogously, multiple leaf directory entries can point to the same offset; this can avoid inefficiently-packed small leaf directories.
* The tentative media type for PMTiles archives is `application/vnd.pmtiles`.
### Implementation suggestions ### Implementation suggestions
* PMTiles is designed to make implementing a writer simple. Reserve 512KB, then write all tiles, recording their entry information; then write all leaf directories; finally, rewind to 0 and write the header. * PMTiles is designed to make implementing a writer simple. Reserve 512KB, then write all tiles, recording their entry information; then write all leaf directories; finally, rewind to 0 and write the header.