GeoTOP is a three-dimensional model of the layer structure and soil type (clay, sand, gravel and peat) of the shallow subsurface of the Netherlands to a depth of up to 50 m below NAP. In GeoTOP, the subsurface is subdivided into a regular three-dimensional grid of connected voxels (volume cells) of 100 by 100 m in the horizontal direction and 0.5 m in the vertical. Properties are associated with each voxel. These are the lithostratigraphic or geological unit (layer) to which a voxel belongs, the lithoclass (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 drilling descriptions used to create the model. To create GeoTOP, the mainland of the Netherlands is 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 use on a local scale; Additional data will always be required to create a local subsurface model. For further information, please refer to the BRO website: https://basisregisterondergrond.nl/
