Downs N J, Butler H J, Baldwin L, Parisi A V, Amar A, Vanos J, Harrison S
Centre for Applied Climate Sciences, University of Southern Queensland, Toowoomba, Australia.
Queensland University of Technology, Faculty of Health, Brisbane, Australia.
MethodsX. 2019 Jul 20;6:1683-1693. doi: 10.1016/j.mex.2019.07.013. eCollection 2019.
A standardised procedure for making fair and comparable assessments of the ultraviolet protection of an established tree canopy that takes into account canopy movement and the changing position of the sun is presented for use by government, planning, and environmental health authorities. The technique utilises video image capture and replaces the need for measurement by ultraviolet radiometers for surveying shade quality characteristics of trees growing in public parks, playgrounds and urban settings. The technique improves upon tree shade assessments that may be based upon single measurements of the ultraviolet irradiance observed from a fixed point of view. The presented technique demonstrates how intelligent shade audits can be conducted without the need for specialist equipment, enabling the calculation of the Shade Protection Index (SPI) and Ultraviolet Protection Factor (UPF) for any discreet time interval and over a full calendar year. •Tree shade UPF measurements are presented using video capture analysis of moving canopies•A standard method for making accurate assessments of tree shade has been developed•Tree shade comparisons are made without the need for specialist equipment.
本文提出了一种标准化程序，用于对成熟树冠的紫外线防护进行公平且可比的评估，该程序考虑了树冠的移动和太阳位置的变化，供政府、规划和环境卫生部门使用。该技术利用视频图像捕捉，取代了使用紫外线辐射计进行测量的需求，用于调查公园、操场和城市环境中树木的遮荫质量特征。该技术改进了可能基于从固定视角观察到的紫外线辐照度单次测量的树木遮荫评估。所提出的技术展示了如何在无需专业设备的情况下进行智能遮荫审计，从而能够计算任何离散时间间隔以及一整个日历年的遮荫保护指数（SPI）和紫外线防护系数（UPF）。• 使用移动树冠的视频捕捉分析呈现树木遮荫UPF测量结果• 已开发出一种对树木遮荫进行准确评估的标准方法• 无需专业设备即可进行树木遮荫比较。
