Visibility analysis and DEM uncertainty propagation

Visibility analysis and DEM uncertainty propagation
María Victoria Alvarez

LatinGEO Lab, SGM+Universidad ORT del Uruguay (valvarez@adinet.com.uy)

Abstract: This study focuses on the problem of determining the accuracy of the calculated visibility analysis of an iconic building at Montevideo city, the Telecommunication Tower. This 157 m tall building is a very important architectural piece and also a central telecommunication tower. These two aspects must be considered in a visibility analysis: a) the building is expected to take a central role in the urban landscape, on the sightline of a significant part of the city; and b) the transmission scope of the tower must reach as many other telecommunication antennas as possible. The first matter can be considered as a sightline issue that requires calculating unobstructed line-of-sight between two points. The second one requires calculating Fresnel zone clearance to analyze interference by obstacles near the path of the electric radio-wave. In any case, the minimum height for the building is a function of the DEM of the city, conditioned to its expected visibility area. The study focuses particularly on the problem of determining the accuracy of the visibility analysis, by studying the propagation of DEM uncertainty.

Keywords: DEM uncertainty, visibility analysis, Monte Carlo, variogram.

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