General Depth of IJsselmeergebied 1905

Bottom height model of the IJsselmeer area, consisting of a grid (100 m x 100 m). Soil depth in centimetres relative to average low water. The model is calculated on the basis of digitised data from a scan of The map of the Zuiderzee from 1905 with inscription: Amsterdam, Seyffaerdt?s bookstore. Revised 1905 by S. Mars, Affiliate Set-up a.h. Kon. Ned. Meteorol. Institute in Amsterdam. Also serving to clarify Bom?s guide to the Zuiderzee. The card has a stamp with the mention Rijksdienst voor de IJsselmeerpolders. I'm done. Antiquity. Soil research, Form C5, herd book no. 117756 (where the numer is poorly readable). The scan is provided with georeference according to the national triangle system (RD) based on the coordinate crosses present on the original map. The original analogue map is in the possession of the National Cultural Heritage Office.