OGC API — Features (OAF) Hamburg

OGC API — Features (OAF) is a standard of the Open Geospatial Consortium (OGC) and specifies a programming interface (API) for querying spatial data on the web.
It is a complete revision and consistent modernisation of the OGC Web Feature Service (WFS) and relies on the use of common web standards (e.g. REST).

A selection of innovations:
— per record, resources are defined that can be requested in different representations (GeoJSON, GML and HTML)
— HTTP content-negotiation is used to request a specific representation

— easy filtering via URL parameters — the APIs are described according to the OpenAPI Specification

— the preset coordinate reference system is WGS84 (geographical coordinates, EPSG:4326), the request of other coordinate reference systems, e.g. ETRS89/UTM Zone 32N (EPSG:25832) is possible
For the Urban Data Platform Hamburg, the entry page of this API can be found at https://api.hamburg.de/datasets/v1.
The data sets available via the API are listed there.
Related links:

— OGC API — Features Hamburg

— Website to OGC API — Features

— Documentation on the use of the API

— E-learning module for OGC API — Features

OGC API — 要素（OGC API — Features，简称OAF）是开放地理空间联盟（Open Geospatial Consortium，OGC）制定的标准，其规定了用于在Web端查询空间数据的编程接口（API）。
该标准是对OGC Web要素服务（OGC Web Feature Service，简称WFS）的全面修订与一致性现代化升级，并依托通用Web标准（如REST）构建。

核心创新点包括：
— 针对每条记录，定义了可通过多种表述格式请求的资源（GeoJSON、GML与HTML）
— 采用HTTP内容协商机制请求特定格式的资源
— 支持通过URL参数实现便捷筛选，且所有API均遵循OpenAPI规范（OpenAPI Specification）进行描述
— 预设坐标参考系统为WGS84（地理坐标系，EPSG:4326），同时支持请求其他坐标参考系统，例如ETRS89/UTM 32N带（EPSG:25832）

针对汉堡城市数据平台，该API的入口页面为https://api.hamburg.de/datasets/v1，平台上罗列了可通过该API获取的全部数据集。

相关链接：
— 汉堡OGC API — 要素
— OGC API — 要素官方网站
— API使用文档
— OGC API — 要素在线学习模块