mirrors/PMTiles
1
0
Fork 0
mirror of https://github.com/protomaps/PMTiles.git synced 2026-02-04 02:41:09 +00:00
Code Issues Packages Projects Releases Wiki Activity

readme revisions

Browse Source
This commit is contained in:
Brandon Liu
2021-04-15 10:50:28 +08:00
parent a31abbb56f
commit c1c4561a9d
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
README.md
View File

@@ -31,7 +31,9 @@ Example of a raster PMTiles archive decoded and displayed in Leaflet:
## Specification
PMTiles is a binary serialization format designed for two main access patterns: over the network, via HTTP 1.1 Byte Serving (`Range:` requests), or via memory-mapped files on disk. All integer values are little-endian
![layout](layout.png)
PMTiles is a binary serialization format designed for two main access patterns: over the network, via HTTP 1.1 Byte Serving (`Range:` requests), or via memory-mapped files on disk. **All integer values are little-endian.**
A PMTiles archive is composed of:
* a fixed-size 512,000 byte header section
@@ -56,8 +58,6 @@ An entry consists of:
* 6 bytes: the offset of where the tile begins in the archive.
* 4 bytes: the length of the tile, in bytes.
![layout](layout.png)
### Notes
* A full directory of 21,845 entries holds exactly a complete pyramid with 8 levels, or 1+4+16+64+256+1024+4096+16384.
* A PMTiles archive with less than 21,845 tiles should have a root directory and no leaf directories.