Quantitative Intervisibility Analysis Based on Improved PickFromRay Algorithm
Intervisibility analysis provides insight into the visible extent of terrain or the level of visibility between points within an environment.Scientific and objective evaluation of the intervisibility effect in three-dimensional scenes plays an important role in many fields,such as urban architectural planning,cultural landscape design,etc.As to the absence of quantitative evaluation in conventional intervisibility analysis techniques,this paper aims to present a novel method to changing the situation in three-dimensional intervisibility analysis.The method is founded on the well-established PickFromRay algorithm utilized in traditional two-dimensional intervisibility analysis,and it expands its application to three-dimensional spaces.It increases the vertical rota-tion while rotating the line of sight horizontally,so that the observer can see from different angles,thereby achieving three-dimensional intervisibility analysis.At the same time,this method applies the concept of voxels to the field of conventional geo-graphic information system,providing quantitative evaluation of the intervisibility effect by calculating the number of voxels and total volume within the three-dimensional scene.Finally,the paper takes a three-dimensional campus scene as an example and uses the proposed method to evaluate the results of visibility analysis quantitatively,revealing the specific influences of the dis-tance between observation points and obstacles,viewing angle indicators,and buildings distribution on observers'sight of view.Apart from the significant reference value in quantitative visibility analysis in three-dimensional space,this method for three-dimensional intervisibility analysis holds important reference value in quantitative researches whose impact factors are based on linear propagation in practical application,such as the quantitative researches on the effect of urban light pollution.
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