The PO.DAAC is pleased to announce the general availability of Hydrocron - an API for time series retrievals of hydrology data products from the Surface Water and Ocean Topography (SWOT) mission.

Hydrocron currently supports queries for:

• individual river reaches and nodes found in the SWOT_L2_HR_RiverSP_2.0 collection, using the well-known feature identifiers from the SWOT River Database (SWORD)
• individual prior lakes* found in the SWOT_L2_HR_LakesSP_2.0 collection using the well-known feature identifiers from the SWOT Prior Lakes Database (PLD).

Time series observations are returned in either GeoJSON or CSV format, and users can specify which fields of interest to return**. Example queries and full descriptions of the request parameters, responses, and error messages can be found in the documentation, and further information about Hydrocron and the types of analysis it can support is available in the Earthdata article found here.

Hydrocron is developed as open source software. Source code, known issues, and feature development requests can be found on GitHub.

* Note that at this time Hydrocron does not support observed lakes or unassigned lakes from the SWOT_L2_HR_LakesSP_2.0 collection.

** Note that Hydrocron only supports returning the attribute fields for the prior lake features. The geometries returned when requesting GeoJSON are the approximate centerpoints of the lake, and not the full polygon geometries.