Open data available via the IHM website

IHM (Informatiehuis Marien) publishes data via services from RWS (Rijkswaterstaat), WMR and from projects.  Another important partner is the platform marine monitoring (PMM (Platform Mariene Monitoring)). If you have questions, please contact us at

Basic data

Basic data is the data that is most useful for re use. For backgrounds please read the  protocol mariene data.

User rights

Data are generally free for use (unless stated otherwise)  “public domain CC0” (creative commons zero).


The data from “natuurcompensatie 2e maasvlakte (NC2M)” are owned by  Rijkswaterstaat, The  data from “shortlist wind op zee (WOZ)” and “Windmolenpark Egmond aan Zee (OWEZ (Het Offshore Windpark Egmond aan Zee))” are owned by the partners of those projects.


The data are presented as far as feasible using the Dutch  AQUO standard. For explanation and the meaning of the semantics please look at: domeintabellen server van het IHW.


Monitoring was carried out in order to establish answers to policy questions. This has led to final reports that can be obtained under the tab “projecten”. A large proportion of those monitoring results are available here for reuse under the reuse directive (2003/98/EC) as implemented in Dutch law. Interpretation of the data is the sole responsibility of the person performing this interpretation.