data web service (DWS) retirement
The old-fashioned data web service is going to retire in August 2025. It is replaced by the data streams of https://ingest.o2a-data.de/. The O2A data streams contain exactly the same functionality as the old data web service, plus some new features and with a fresh and new user interface. Under the hood a new and dedicated to time series PostgreSQL extension called TimescaleDB ensures high performance and low latency.
Please note that https://ingest.o2a-data.de/streams is not yet productive, but in testing mode. The latest data is from mid 2024 until migration of the old dws database will take place August 2025.
(1) the facets to search and filter for streams,
(2) full text search bar,
(3) information on the specific parameter, this leads to the corresponding item in registry.
After selection of the relevant parameters the button Build a data request... leads to a dialogue to specify a request.
(1) the start date of the request,
(2) the end date of the request,
(3) aggregate level, possible options
- year
- month
- week
- day
- hour
- minute
- second
- millisecond
(4) descriptive statistic function applied to aggregate values, possible options
- minimum
- 25th percentile
- median/50th percentile
- 75th percentile
- maximum
- mean
- standard deviation
- variance
- sum of values
- number/count of values
(5) the output format, possible options
(6) option to copy the http link to the clipboard
(7) start download to a local file
As the predecessor the data streams are equipped with a powerful API. The swagger documentation is available under https://ingest.o2a-data.de/api/. In addition data streams also support SensorThings API also known as STA (an OGC standard) as one of the outcomes of HMC STAMPLATE project. The corresponding endpoint can be found at https://ingest.o2a-data.de/sta/.