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Add terrain tiles, with elevations encoded as RGB values. #660

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Add terrain tiles, with elevations encoded as RGB values. #660

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Add `terrarium` encoding for terrain.
brawer May 13, 2026
6b977d8
Clarify that `terrarium` only makes sense for raster images in lossle…
brawer May 14, 2026
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5 changes: 4 additions & 1 deletion spec/v3/CHANGELOG.md
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@@ -1,5 +1,8 @@
# Changelog

## Version 3.6
- Add `terrarium` encoding for terrain.

## Version 3.5
- add [MapLibre Vector Tile](https://github.com/maplibre/maplibre-tile-spec) `.mlt` enum by @msbarry [#596]

Expand All @@ -18,4 +21,4 @@
## Version 3.1
- added `metadata` details about `vector_layers`.
- Clarified that directory entry lengths must be nonzero, and directories must be non-empty.
- add AVIF to TileTypes.
- add AVIF to TileTypes.
1 change: 1 addition & 0 deletions spec/v3/spec.md
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Expand Up @@ -374,6 +374,7 @@ Additionally, this specification defines the following keys, which MAY be includ
|`attribution`|An attribution to be displayed when the map is shown to a user. Implementations MAY decide to treat this as HTML or literal text. |string|
|`type`|The type of the tileset |a string with a value of either `overlay` or `baselayer`|
|`version`|The version number of the tileset|a string containing a valid version according to [Semantic Versioning 2.0.0](https://semver.org/spec/v2.0.0.html) |
|`encoding`|Any additional encoding applied to tile data. A value of `terrarium` means the tileset is a Digital Terrain Model with elevation in meters equal to `(red * 256 + green + blue / 256) - 32768`; only meaningful for raster images in lossless compression.|string|

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