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Dendrochronology > Research > Pages > default

 About our Research


Dendrochronological data are an essential and unique source of information about chronology, the social economy, cultural landscape, climate, forest management and wood technology.


 Project Descriptions

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Towards a European research and data network for cultural tree-ring studies

This project was funded by the Netherlands Organization for Scientific Research (NWO) section Humanities (subsidy Internationalization Humanities 2010-2013) and was hosted by the Cultural Heritage Agency (RCE/OCW) 

The project ran from August 2010 to July 2013 and was directed at incorporating dendrochronologists in Austria, Denmark, Ireland, Latvia, Lithuania, Poland, Slovenia, Spain and the UK into the DCCD network and at placing sustainable tree-ring data management on the international research-political agendas.

During the project the participants have uploaded ca. 4000 tree-ring time series and their metadata to the DCCD and performed collaborative research on tree-ring series (oak and pine) from 17th-century artefacts and buildings, focussing on topics that benefit from international collaboration.

All studied data have been upgraded to the new international data requirements TRiDaS. The DCCD data library was used for data exchange and storage during and after the project.


Brewer, P.W., D. Murhpy & E. Jansma, 2011: TRiCYCLE: a universal conversion tool for digital tree-ring data. Tree-Ring Research 67(2), 135-144.

Jansma, E., 2010: Preserving tree-ring data: a repository for the Low Countries. In: M. de Groot & M. Wittenberg (eds.): Driven
by data: exploring the research horizon, Amsterdam University Press/Pallas Publications, 29-33.

Jansma,E., 2013. Towards sustainability in dendroarchaeology: the preservation, linkage and reuse of tree-ring data from the cultural and natural heritage in Europe. In: Bleicher, N., P. Gassmann, N. Martinelli & H.Schlichtherle (eds.), DENDRO -Chronologie, -Typologie, -Ökologie, Freiburg, 83-90.

Jansma, E., P.W. Brewer & I. Zandhuis 2010: TRiDaS 1.1: the tree-ring data standard. Dendrochronologia 28, 99-130.

NEW  Jansma, E., K. Haneca & M. Kosian, 2014: A dendrochronological reassessment of three Roman vessels from Utrecht (the Netherlands): evidence of inland navigation between the lower-Scheldt region in Gallia Belgica and the limes of Germania inferior. Journal of Archaeological Science.

Jansma, E. & R.J. van Lanen, 2012. Een digitale bibliotheek van dateringen: de internationale doorwerking van een Nederlands initiatief. Vitruvius 20, 36-41.

Jansma,E., R.J. van Lanen, K. Sturgeon, S. Mohlke & P.W. Brewer, 2012. TRiDaBASE: A stand-alone database for storage, analysis and exchange of dendrochronological metadata. Dendrochronologia 30(3), 209-211.

Jansma, E., R.J. van Lanen, P.W. Brewer & R.Kramer, 2012. The DCCD: a digital data infrastructure for tree-ring research. Dendrochronologia 30(4), 249-251.


NWO project information


    Website: E. Jansma, last update 08-16-2014
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This project is funded by the Netherlands Organization for Scientific Research (NWO, section Humanities (subsidy Internationalization Humanities 2009-2011)) and is hosted by the Cultural Heritage Agency (RCE/OCW)


General information

is used throughout Europe to answer questions about cultural heritage, such as the age and origin of wooden artifacts, economy, trade and the technological aspects of ancient craftsmanship.

For the Iberian Peninsula existing tree-ring chronologies are too short and few to allow such studies, resulting in inadequate assessments of wooden heritage in, and originating from, this region. This is illustrated by our inability to date and confirm the Iberian origin of certain shipwrecks found in the North Sea using dendrochronology. Equally, 15th and 16th century wrecks of ocean-going Spanish vessels found in the New World remain unidentified and undated, as well as Armada and earlier wrecks of possibly Iberian origin found along the British and Irish coast.

In order to improve the assessment of wooden heritage from the Iberian peninsula we are organizing a structurally anchored international research network of archaeologists, dendrochronologists, conservators, historians and foresters that will work together towards the following objectives:

1) to create an overview of existing tree-ring data for the Iberian Peninsula 

2) to make an inventory of forests and cultural heritage suited for follow-up research

3) to develop and refine an international research agenda, and

4) to perform a pilot study of selected historical objects illustrating the potential of dendrochronology in the SW of Europe.

Newly acquired dendrochronological data will be uploaded to the DCCD facility (Digital Collaboratory for Cultural Dendrochronology) and results will be published and used by the network in national and international research proposals.

NWO Project information


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Digital Collaboratory for Cultural Dendrochronology (DCCD)
A digital data library for dendrochronology

This project is funded by the Netherlands Organization for Scientific Research (NWO) section Humanities (Medium Investment subsidy 2008-2011) and is hosted by the Cultural Heritage Agency (RCE/OCW) 




Goals of the collaboratory:

  • The international standardization of dendrochronological data and metadata;
  • The development of a sustainable and integrated repository of these data;
  • Unlocking these data for interdisciplinary and international follow-up research

European data collections with relevance to cultural-historical research in the Low Countries are upgraded and combined for the benefit of large-scale research in the field of wood usage and landscape history.

After completion of the project in 2011, the DCCD contains over 30,000 measurement series and their descriptive metadata, representing over 20,000 trees that grew between 6000 BC and present.

An important feature of the DCCD repository is that data contributors control the access to their data.

Read more

This tryptich belonged to the Dutch statesman Johan van Oldenbarnevelt. The oak panels were dated dendrochronologically to the early 17th century. Source (photo): Memoria in beeld, UU. Research: the Netherlands Centre for Dendrochronology (Stichting RING).


Website: E. Jansma, last update 19-9-2010



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