Hi @mfedderly! I’ve updated Turf to the latest version (v7.3.0), and the isoband function is no longer working as before.

The output has changed for the same interpolateGrid input, and using more than 15 intervals no longer returns a proper isobands.

v7.2.0:

v.7.3.0:

Here you can find attach the input and the 2 outputs with 15 intervals.

interpolatedGrid.json

7.2.0-output.json
7.3.0-output.json