A digital terrain model (DTM) is a three - dimensional representation of a terrain surface consisting of X, Y, Z coordinates, stored in digital form. It is a continuous model of ground-level land surface represented by a digital raster grid, with each grid cell holding an elevation value.

We provide a DTM which covers the whole of the Maltese Islands (320 km²), with a grid-spacing of 5 metres which are processed using digital photogrammetric methods.

DTM's have become a major component of geographical information processing as these assist in modelling, analysing and displaying phenomena related to topographical or similar surfaces. They are a fundamental data input for exercises such as groundwater and watershed analysis, quarrying studies and radio propagation studies.