A computationally cheap trick to determine shadow in a voxel model

B. G.H. Gorte; K. Zhou; C. J. Van Der Sande; C. Valk

doi:10.5194/isprs-annals-IV-4-67-2018

A computationally cheap trick to determine shadow in a voxel model

B. G.H. Gorte^*, K. Zhou, C. J. Van Der Sande, C. Valk

^*Corresponding author for this work

Optical and Laser Remote Sensing

Research output: Contribution to journal › Conference article › Scientific › peer-review

7 Citations (Scopus)

66 Downloads (Pure)

Abstract

Representation of scenes on the Earth surface by using voxels is gaining attention because of its suitability for integrating heterogeneous data sources in simulations and quantitative models. Computation of shadows in such models is needed, for example, to obtain crop suitability of agricultural fields in the presence of trees and buildings, or to analyze urban heat island causes and effects. We present an efficient algorithm to compute which of the voxels in a dataset receive direct sunlight, given the solar azimuth and elevation angles. The algorithm can work with multiple (sparse and dense) voxel storage strategies.

Original language	English
Pages (from-to)	67-71
Number of pages	5
Journal	ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Volume	4
Issue number	4
DOIs	https://doi.org/10.5194/isprs-annals-IV-4-67-2018
Publication status	Published - 19 Sept 2018

Keywords

3D City models
Quantitative Modelling
Shadow
Simulation
Voxels

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10.5194/isprs-annals-IV-4-67-2018

isprs-annals-IV-4-67-2018Final published version, 807 KBLicence: CC BY-NC-ND

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AU - Gorte, B. G.H.

AU - Zhou, K.

AU - Van Der Sande, C. J.

AU - Valk, C.

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N2 - Representation of scenes on the Earth surface by using voxels is gaining attention because of its suitability for integrating heterogeneous data sources in simulations and quantitative models. Computation of shadows in such models is needed, for example, to obtain crop suitability of agricultural fields in the presence of trees and buildings, or to analyze urban heat island causes and effects. We present an efficient algorithm to compute which of the voxels in a dataset receive direct sunlight, given the solar azimuth and elevation angles. The algorithm can work with multiple (sparse and dense) voxel storage strategies.

AB - Representation of scenes on the Earth surface by using voxels is gaining attention because of its suitability for integrating heterogeneous data sources in simulations and quantitative models. Computation of shadows in such models is needed, for example, to obtain crop suitability of agricultural fields in the presence of trees and buildings, or to analyze urban heat island causes and effects. We present an efficient algorithm to compute which of the voxels in a dataset receive direct sunlight, given the solar azimuth and elevation angles. The algorithm can work with multiple (sparse and dense) voxel storage strategies.

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KW - Quantitative Modelling

KW - Shadow

KW - Simulation

KW - Voxels

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JF - ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences

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A computationally cheap trick to determine shadow in a voxel model

Abstract

Keywords

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