line-segments
A collection of lines composed of straight segments. Often the collection will be broken down into connected linear structures called strings or polylines. The Parts mechanism can be used for capturing the details of that additional structure.
segments
The vertices and indices of the segments.
vertices : Table of vertex coordinates. Columns: x, y, z.
- An optional attribute list can be associated with the vertices.
indices : Table of 0-based indices into vertices. Each pair is a segment. Columns: n0, n1.
- An optional attribute list can be associated with the segments.
If the segments are organised into strings or polylines then adjacent segments will usually share an index. In those cases the indices are also often sequential. An example of the indices for four connected segments might be [(0, 1), (1, 2), (2, 3), (3, 4)]. If the segments formed a closed loop then your last pair could be (3, 0) indicating that the last vertex in the segment chain was the same as the first.
parts
A structure defining chunks A structure defining chunks of segments in the line collection. Parts allow us to combine individual segments into longer elements.
chunks -
Each chunk is a tuple defining the first index and the length of a chunk of vertices. The chunk refers to a contiguous piece of the segment array. Chunks do not have to include all segments, and chunks can overlap. Columns: offset, count
attributes — the parts can have an optional attribute list in the standard manner.
Properties
line-segments (v2.2.0)
A collection of lines composed of straight segments. Optionally, consecutive chunks of segments can be grouped and attributed.
| Property | Type | Description | Flags |
|---|---|---|---|
| name | String | Name of the object. | ⬆️ ✅ |
| uuid | base-object-properties | Identifier of the object. | ⬆️ ✅ |
| description | String | Optional field for adding additional description to uniquely identify this object. | ⬆️ |
| extensions | Object | Extended properties that may be associated to the object, but not specified in the schema | ⬆️ |
| tags | Object | Key-value pairs of user-defined metadata | ⬆️ |
| lineage | lineage | Information about the history of the object | ⬆️ |
| bounding_box | bounding-box | Bounding box of the spatial data. | ⬆️ ✅ |
| coordinate_reference_system | crs | Coordinate system of the spatial data | ⬆️ ✅ |
| schema | String | ✅ | |
| segments | segments | Vertices and segments. | ✅ |
| parts | line-segments | An optional structure defining segment chunks the line collection is composed of. |
Legend
| Flag | Description |
|---|---|
| ⬆️ | Inherited property |
| ✅ | Required property |
