Problem with "--no-duplication" and "--no-clipping"

[bertcoerver]

Hello,

I want to create pbf-tiles in which features are not clipped nor duplicated, i.e. features are allowed to extend beyond the tiles borders and should only be included in one tile.

But I have the feeling the "--no-clipping" flag is not working correctly. I'm quite new to using Tippecanoe, so maybe I'm just doing something wrong. Some examples:

1. ✅ The "default":

tippecanoe -e test1 --no-tile-compression input.geojson gives:

This is the border between 4 tiles, you can see that the feature in the middle is clipped and distributed over the 4 tiles.

2. ❌ Using only --no-clipping

tippecanoe -e test2 --no-tile-compression --no-clipping input.geojson gives:

Even though I asked to not clip the features, they still are clipped to the tile borders?

3. ✅ Using --no-duplication

tippecanoe -e test3 --no-tile-compression --no-duplication input.geojson

So now indeed, the features are not duplicated, but they are still clipped to the tile boundaries. (The pink background is input.geojson)

4. ❌ Using both --no-clipping and --no-duplication

tippecanoe -e test4 --no-tile-compression --no-clipping --no-duplication input.geojson

Again, the features aren't duplicated, but they are still clipped.

The documentation says:

• -pc or --no-clipping: Don't clip features to the size of the tile. If a feature overlaps the tile's bounds or buffer at all, it is included completely. Be careful: this can produce very large tilesets, especially with large polygons.

But in the above examples the features are not included completely?

Thanks,
Bert

tippecanoe --version
>>> tippecanoe v2.40.0