Consist of interpolated spot heights at 10m intervals derived from the OSNI 60m Enhanced DTM product, processed using a Triangulated Irregular Network (TIN) and do not contain the break lines.

In areas of quick elevation changes, interpolation or re-sampling errors may become more visible due to the measurement spacing. Some features will appear more generalised (e.g. cliff edge, quarry terrain and other less-smooth terrain).

This product is a static historical dataset (not scheduled for updates).