Soil depth Zeeland (currently)

The Zeeland grid is a composite depth grid based on the depth information in the Inland ENC of Zeeland. The grid is composed of ± 1150 lodges. The actual number of lodges differs per edition of the Zeeland grid. The accuracy depends on the type of loding on site, the most accurate loding is the multibeam loding. These meet the IHO special order standard. The entire grid was produced in UTM(31) projection and then transformed into R.D. The vertical reference is the N.A.P. Through the transformation from UTM to RD, an additional deviation occurs in the bottom height. This deviation is almost random and different for each grid cell. This extra deviation in the height is 99 % of the grid within 15 cm. In the case of a soil with a very steep slope, the deviation can be up to 2 m. Cells with a very different depth are always isolated grid cells. In the surrounding grid cells, the deviation is much smaller so that a correct soil image remains visible. The Zeelandgrid can be used as an indicative grid. It is not suitable for navigation, control of other lodges or for volume calculations. This is due to the transformation from UTM31 to RD.