Vector Extension Specification
- Title: Vector
- Identifier: https://stac-extensions.github.io/vector/v0.1.0/schema.json
- Field Name Prefix: vector
- Scope: Item, Collection
- Extension Maturity Classification: Proposal
- Owner: @m-mohr
This document explains the Vector Extension to the SpatioTemporal Asset Catalog (STAC) specification. It defines basic properties and metrics of vector data (as in: geometries with additional properties). This extension works well in conjunction with the Table Extension for tabular / columnar datasets.
- Examples:
- JSON Schema
- Changelog
Fields
The fields in the table below can be used in these parts of STAC documents:
- Catalogs
- Collections
- Item Properties (incl. Summaries in Collections)
- Assets (for both Collections and Items, incl. Item Asset Definitions in Collections)
- Table Column
- Links
| Field Name | Type | Description |
|---|---|---|
| vector:geometry_types | [string] | A list of the geometry types present in the dataset. |
| vector:mmu | number | Minimum Mapping Unit - the smallest polygon area represented. |
| vector:mmw | number | Minimal Mapping Width - the smallest real-world width represented as polygon. |
| vector:reference_scale | integer | Representative fraction denominator (e.g., 50000 for 1:50,000). |
Additional Field Information
vector:geometry_types
Lists the GeoJSON geometry types present in the described dataset.
The list MUST contain each geometry type at most once and MAY be in any order.
MUST be one of the GeoJSON geometry types:
PointMultiPointLineStringMultiLineStringPolygonMultiPolygonGeometryCollection
vector:mmu
Minimum Mapping Unit (MMU) is the smallest polygon area represented in the dataset.
- Use this to communicate the effective minimum area of polygonal features after generalization.
- Unit MUST be square meters (