GeoTOP is a three-dimensional model of the layer structure and soil type (clay, sand, gravel and peat) of the shallow subsurface in the Netherlands to a maximum depth of 50 m below NAP. In GeoTOP, the subsoil is subdivided into a regular three-dimensional grid of contiguous voxels (volume cells) of 100 by 100 m in the horizontal direction and 0.5 m in the vertical direction. Properties are associated with each voxel. These are the lithostratigraphic or geological unit (layer) to which a voxel belongs, the litho class (soil type) that is representative of the voxel and a number of attributes that together form a measure of model uncertainty. In addition to voxels, GeoTOP also contains a detailed layer model and the interpreted bore descriptions used in the model creation. To create GeoTOP, the mainland of the Netherlands has been divided into a number of regions, called model areas. GeoTOP is not yet ready for all model areas. Furthermore, the subsurface of the Dutch part of the Continental Shelf is not included in GeoTOP. GeoTOP is a (sub)regional model. It is not suitable for local scale use; additional data will always be required to create a local subsurface model. For further information, please refer to the website of the BRO: https://basisregistratieondergrond.nl/
