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Comparison of Communication Viewsheds Derived from High-Resolution Digital Surface Models Using Line-of-Sight, 2D Fresnel Zone, and 3D Fresnel Zone Analysis

Department of Energy Resources Engineering, Pukyong National University, Busan 48513, Korea
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ISPRS Int. J. Geo-Inf. 2018, 7(8), 322; https://doi.org/10.3390/ijgi7080322
Received: 29 June 2018 / Revised: 29 July 2018 / Accepted: 7 August 2018 / Published: 9 August 2018
We compared three methods for deriving communication viewsheds, which indicate the coverage areas for transmitter points from high-resolution digital surface models. Communication viewsheds were analyzed with a novel 3D Fresnel zone method, as well as line-of-sight (LOS) analysis and 2D Fresnel zone analysis, using high-resolution digital surface models (DSM) from a topographical survey. A LOS analysis calculates a visibility index by comparing the profile elevations of landforms between the transmitter and the receiver, using LOS elevations. A 2D Fresnel zone analysis calculates a 2D Fresnel index by comparing the profile elevations of landforms with the transverse plane elevations of the Fresnel zone. A 3D Fresnel zone analysis quantitatively analyzes communication stability by calculating a 3D Fresnel index, obtained by comparing the elevations of every terrain cell in a Fresnel zone with the total altitude of the Fresnel zone. The latter produced the most accurate results. Indexes derived by applying different transmitter offset heights, signal frequencies, and DSM resolutions for each of the three methods were then quantitatively analyzed. As both the offset height of the transmitter and the signal frequency decreased, the differences between the results derived from each method increased significantly. Moreover, larger DSM cells generated less accurate results. View Full-Text
Keywords: geographic information systems; viewshed analysis; line of sight; 3D Fresnel zone; wireless communication; digital surface model geographic information systems; viewshed analysis; line of sight; 3D Fresnel zone; wireless communication; digital surface model
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Baek, J.; Choi, Y. Comparison of Communication Viewsheds Derived from High-Resolution Digital Surface Models Using Line-of-Sight, 2D Fresnel Zone, and 3D Fresnel Zone Analysis. ISPRS Int. J. Geo-Inf. 2018, 7, 322.

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