Building Blocks

The OGC API functionality is split up into building blocks based on OGC API standards and other specifications.

A building block encapsulates related operations, query parameters, path parameters, headers, formats, etc. Each building bock is currently implemented in a dedicated module.

The building blocks are classified according to:

• The state of the specification
  • stable: related to approved standards or drafts in the final voting stage
  • draft: related to drafts in earlier stages (due to the dynamic nature of draft
    specifications, the implementation might not represent the current state at any time)
  • custom: no related standard or draft
• The state of the implementation
  • mature: no known limitations regarding generally supported use cases,
    adheres to code quality and testing standards
  • candidate: no known limitations regarding generally supported use cases,
    might not adhere to code quality and testing standards
  • proposal: stable core functionality, but might have limitations regarding generally
    supported use cases, might not adhere to code quality and testing standards

Overview

Building Block	Classification	Description
3D Tiles	specdraftimplproposal	Publish geographic data as 3D Tiles.
CRS	specstableimplmature	Additional coordinate reference systems.
CRUD	specdraftimplproposal	Create, replace, update and delete features.
Codelists	speccustomimplproposal	Publish codelists associated with feature properties.
Common Core	specstableimplmature	The common resources of all OGC Web APIs.
Feature Collections	specstableimplmature	Feature Collections.
Feature Collections - Queryables	specstableimplmature	Metadata about the properties of the features in a feature collection that can be used in filter expressions.
Feature Collections - Schema	specdraftimplcandidate	Publish a logical schema of the feature properties, described in JSON Schema.
Features	specstableimplmature	The core capabilities to publish feature data (vector data).
Features - CSV	speccustomimplcandidate	Encode features as comma-separated values (CSV).
Features - CityJSON	specstableimplcandidate	Encode CityGML building features (LoD1, LoD2) as CityJSON.
Features - Custom Extensions	speccustomimplproposal	Filter by geometry intersection.
Features - FlatGeobuf	speccustomimplcandidate	Encode features as FlatGeobuf.
Features - GML	specstableimplcandidate	Encode features as GML.
Features - GeoJSON	specstableimplmature	Encode features as GeoJSON.
Features - GeoJSON-LD	speccustomimplcandidate	Encode features as GeoJSON-LD.
Features - HTML	specstableimplmature	Encode features as HTML.
Features - JSON-FG	specdraftimplcandidate	Encode features as JSON-FG.
Features - Result Type	speccustomimplproposal	Adds a query parameter to return only the number of features matched by a request.
Features - Search	specdraftimplproposal	Support for fetching features from multiple collections as well as for stored queries.
Features - glTF	specdraftimplproposal	Encode CityGML building features (LoD1, LoD2) as glTF 2.0.
Filter	specstableimplmature	Filter features with CQL2 expressions.
Foundation	specstableimplmature	Essentials, API catalog with all published APIs.
Geometry Simplification	specdraftimplcandidate	Simplification of geometries with Douglas Peucker.
HTML	specstableimplmature	HTML encoding for every supported resource.
JSON	specstableimplmature	JSON encoding for every supported resource.
OpenAPI 3.0	specstableimplmature	Publish OpenAPI definitions.
Projections	specdraftimplcandidate	Select the feature properties included in the feature response.
PubSub	specdraftimplproposal	Publish feature changes via a MQTT broker
Resources	speccustomimplcandidate	Publish and manage file resources.
Routing	specdraftimplproposal	Calculate and manage routes.
Sorting	specdraftimplproposal	Sort features in a response.
Styles	specdraftimplcandidate	Publish styles.
Text Search	specdraftimplproposal	General text search in multiple text properties of the data.
Tile Matrix Sets	specstableimplmature	Provides definitions of the Tile Matrix Sets used in the API.
Tiles	specstableimplmature	Publish geographic data as tiles.
XML	specstableimplcandidate	XML encoding for every supported resource.