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Digital elevation model (DEM) is a representation of the Earth's relief used for geospatial analysis and modelling. Elevation data are captured in the form of points with defined interval and the Breaklines.Digital elevation models are typically produced as an important basis for design and construction of infrastructure such as roads and railways.

In connection with excavations, open-cut mining and preparation of waste disposal sites, repeated measurement of digital elevation models can document alteration of the terrain and changes in volumes can be calculated.

From a digital elevation model,i-Infotech has derive a number of digital and graphic products, such as:

• Interpolation of height at any terrain point.
• Plots of contours with user-specified contour intervals.
• Generation of longitudinal and cross section profiles.
• Plots of isometric and perspective images.
• Volume calculations, including computation of cut and fill.