Digital Terrain and Clutter

Clutter

TeleResources is able to provide digital terrain and clutter data for use with our radio propagation planning tools. This data is available within Australia and overseas. By ordering this data through us we are able to ensure that it can be used by our software.

Digital Terrain Model (DTM)

A Digital Terrain Model (DTM) is a continuous model of ground-level land surface, represented by a digital raster grid with each grid cell holding an elevation value.

A DTM is a fundamental data input for radio propagation studies in that terrain blocks and reflects radio waves.

Clutter

Clutter refers to a Land Use/Land Cover classification of surface features which impact on radio wave propagation. These features are classed according to their physical and electrical properties.

Average obstacle height, local absorption power loss, co-efficients of correction and distance to clearing are some of the clutter-specific parameters that can be set and adjusted in propagation modeling. Image classification for RF propagation studies must accurately model clutter in terms of its influence on radio wave propagation.

Clutter is generally produced from multispectral satellite imagery where distinct classes of surface features can be delineated through spectral homogeneity and other characteristics. For certain classes such as water, forest and crop land we can employ supervised classification techniques. This is an automatic yet iterative process, the results of which are checked and rechecked for classification accuracy.

Most features of the built environment, however, are classified through manual photo-interpretation. The final clutter layer is a raster grid where each numeric cell value corresponds to a particular clutter class.

TeleResources can provide data sets for any area of the globe ranging from 5m to 90m order of accuracy.