(1Dutch heritage, Amsterdam / 2MBB Vu University Amsterdam, The Netherlands)

Abstract: Dorestad (modern Wijk  bij Duurstede)  Is one of the largest and longest ongoing city excavations in the world, Covering an area of 2,5 by 1.9 kilometers. More than 1200 trenches were dug, more than 2 million finds were administrated and more than 15000 drawings were made.  Four major excavations have been carried out: 1920, 1960, 1970 and 1990 until now. Also numerous smaller excavations have been carried out in the last 75 years.  Two new excavations are planned for this and next year.  Within the foreseeable future the whole of the city area of Dorestad will have been excavated.
However due to the accumulation of data, the different type of city excavation in time,  changes in the administration system, changing political and social circumcisions, nothing has been properly analyzed . The result was that each succeeding excavation did not have insight into the previous ones and could not profit from it. The whole of Dorestad remained a jigsaw and each new excavation added more pieces.  From the 1990s on it was believed that due to the amount of data it was not possible to disclose the previous excavations.
Four years ago a plan was set in motion to change all that The Odyssey_ project was intended to disclose every bit of old excavation data from Dorestad and other  major backlogs  in excavations in Holland. Conceived and headed by Professor Jos Bazelmans   Head of the Dept. of Research of Dutch heritage, a team of specialists disclosed all the old material.  It has become available for use in future excavations.

This paper focuses on the need of information of old material for current city excavations.  Without this information will just remain a jigsaw piece and not a part of the whole story of the city

Keywords: city excavation, heritage integration and standardization of excavation information