GEOPROCESSING SERVICE Esri ArcGIS Server – LineOfSight

Geoprocessing service LineOfSight is a public service intended for visibility analysis using the digital terrain or digital surface model. The geoprocessing service enables the user to find out which parts of the surface/terrain along the given line leading from the observation to the target point are visible. The user can use the digital surface model of the 1st generation rasterised to 2 m resolution, the digital terrain model of the 4th generation rasterised to 2 m resolution, or the digital terrain model of the 5th generation rasterised to 5 m resolution. Selection of the input model is set in the "Model" parameter. When using the service, it is necessary to choose the observation location, choose the target location and specify the offset above the surface/terrain. The result of the analysis is a line of sight (line of visibility) with visible and invisible parts leading along the surface. The target is visible (TarIsVis = 1) if there is no terrain or surface barrier along the line between the observation and target points. The target is not visible (TarIsVis = 0) if there is a barrier limiting the direct visibility of the target. A barrier is detected if the line crosses terrain, or a forest or building in the case of the digital surface model. The geoprocessing service LineOfSight is significantly faster than the geoprocessing service Visibility. The service is particularly advantageous for visibility analysis over longer distances.