pointsby

Pointsby is a term used in discussions of data organization to describe a collection of points that are grouped or indexed by one or more attributes, such as coordinates, time, or category. In this sense, a pointsby set emphasizes both the spatial or geometric nature of points and the by-keys that organize them for efficient retrieval or analysis. The concept is commonly encountered in introductory explanations of spatial data structures and visualization pipelines.

The term pointsby is not a standard mathematical or computer science designation with formal specifications. It is often employed informally or as a teaching device to illustrate how point data can be partitioned, sorted, or filtered according to chosen attributes. As a result, implementations and exact behaviors can vary across contexts or projects, with practitioners adapting the idea to fit their data and performance needs.

In a typical interpretation, a pointsby object stores elements that each include a point and one or more metadata fields. Common operations include adding points, filtering by attribute values, retrieving subsets by a key, and sorting by a designated attribute. Some designs may support indexing or hashing by the by-keys to speed up lookups, as well as basic spatial computations such as distance, proximity, or neighborhood queries.

Applications of the pointsby concept appear in mapping, geographic information systems, computer graphics, and data visualization, where it is useful to group or query point data by category, timestamp, or spatial region. It serves as a conceptual pattern for organizing point data before applying more specialized structures like point clouds or spatial indices.

Related concepts include point, point cloud, spatial index, and clustering.