Spline Specification

Layer Specification

Spline annotations are stored on a napari Points layer and can contain multiple splines.

• Points.data is an (n, d) array of n d-dimensional points.
• Points.features is a table which will contain a column called spline_id, an integer id for each point.
• Points.metadata["n3d_metadata"] is a dictionary with the following key/value pairs
• annotation_type: spline

Zarr Array Specification

The following assumes an n3d file has been read into a variable called n3d using the zarr library

import zarr

zarr.load('spline.n3d')

• n3d is an (n, d) zarr.core.Array
• n3d.attrs["annotation_type"] is "spline"
• n3d.attrs["spline_id"] is an (n, ) array containing the spline id of each point