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Point Cloud Extension Specification

  • Title: Point Cloud
  • Identifier: pointcloud
  • Field Name Prefix: pc
  • Scope: Item
  • Extension Maturity Classification: Proposal

This document explains the fields of the Point Cloud Extension to a STAC Item, which allows STAC to more fully describe point cloud datasets. The point clouds can come from either active or passive sensors, and data is frequently acquired using tools such as LiDAR or coincidence-matched imagery.

  • Example
  • JSON Schema is missing. PRs are welcome.

Item Fields

Field Name Type Description
pc:count integer REQUIRED. The number of points in the item.
pc:type string REQUIRED. Phenomenology type for the point cloud. Possible valid values might include lidar, eopc, radar, sonar, or other
pc:encoding string REQUIRED. Content encoding or format of the data.
pc:schemas [Schema Object] REQUIRED. A sequential array of items that define the dimensions and their types.
pc:density number Number of points per square unit area.
pc:statistics [Stats Object] A sequential array of items mapping to pc:schemas defines per-channel statistics.

Schema Object

A sequential array of items that define the dimensions or channels of the point cloud, their types, and their sizes (in full bytes).

Field Name Type Description
name string REQUIRED. The name of the dimension.
size integer REQUIRED. The size of the dimension in bytes. Whole bytes only are supported.
type string REQUIRED. Dimension type. Valid values include floating, unsigned, and signed

Stats Object

A sequential array of items mapping to pc:schemas defines per-channel statistics. All fields are optional.

Field Name Type Description
average number The average of the channel.
count integer The number of elements in the channel.
maximum number The maximum value of the channel.
minimum number The minimum value of the channel.
name string The name of the channel.
position integer Position of the channel in the schema.
stddev number The standard deviation of the channel.
variance number The variance of the channel.

Implementations

None yet, still in proposal stage.