The data is based on the monitoring of cockle beds bij cockle-fishermen. Per 200m-square the presence of cockles is counted in the period from 1980 untill 2005. Information about the original data can be found in the report: EVA2-rapport RIZA/2004.028 Bodemgesteldheid en mechanische kokkelvisserij in de Waddenzee; L. Zwarts e.a..

Area Sierra Ventana, abandoned dumping place of dredged material; together with other datasets (identical lui), full-coverage habitat maps were obtained; data has been verified; expert data collection

Compiled information about the presence of mussel beds in mussel areas in the period of 1966 untill 1997. The data is split up in two groups: 1-6 times(years) observed and 7-17 times.

Area Wenduine, 2 profiles perpendicular to the coastline and up to the shore; together with other datasets (identical lui), full-coverage habitat maps were obtained; data has been verified; expert data collection

Area Paardenmarkt, old munitions dump site, 2 profiles perpendicular to the coastline and up to the shore; together with other datasets (identical lui), full-coverage habitat maps were obtained; data has been verified; expert data collection

Area Baland Bank, 2 profiles perpendicular to the coastline and up to the shore; together with other datasets (identical lui), full-coverage habitat maps were obtained; data has been verified; expert data collection

Area Baland Bank, 2 profiles perpendicular to the coastline and up to the shore; together with other datasets (identical lui), full-coverage habitat maps were obtained; data has been verified; expert data collection

Area Sierra Ventana, abandoned dumping place of dredged material; together with other datasets (identical lui), full-coverage habitat maps were obtained; data has been verified; expert data collection