These vector databases should therefore be used in (dense) urban areas to achieve the highest accuracy in the path loss predictions. Vegetation blocks (parks and trees) – either defined as polygonal cylinder (similar to a building – but with different material properties) or imported via a pixel map ( So scanned maps can be converted to vector databases and then saved in one of the above listed file formats. These files can afterwards be imported with also includes a Pixel =>, Vector converter to convert scanned maps into 2D vector data. This converter is developed by AWE Communications and can be configured to obtain best conversion results. If the requirements concerning accuray are not very high, pixel databases can be used to describe the buildings (see figures). But AWE recommends vector databases (see below) to obtain a high accuuracy with the propagation models. If the thickness is smaller than the height, the plate does not touch the ground and the waves can propagate under the plate. The specifications of WinProp’s database file formats for urban building vector data as well as topography pixel data are available for download: Source.