Data and code for "Calibration of simulated spectral indoor daylight models"

This repository contains the data and code for the PhD chapter <strong>"Calibration of simulated spectral indoor daylight models."</strong><strong>Summary of the project:</strong> This chapter introduces and tests a practical calibration workflow for indoor spectral daylight simulation. The workflow aims to account for external sources of uncertainty—namely (1) sun–sky conditions, (2) exterior/context obstructions, and (3) window spectral transmittance—and restricts calibration to the latter. Using short in situ measurements in a University of Toronto classroom, simulated 18-channel irradiances from <em>Radiance</em> v6.0 are compared to field data, and the transmittance spectrum is scaled. Across options, simulated–measured spectral shapes agree well (Pearson <em>r</em> ≈ 0.89–0.92); the best window yields MAE₍room,w₎ = 0.0093 W m⁻². Post-calibration, systematic bias on the control sensor is largely removed for photopic and melanopic illuminance (MBE₍rel₎ ∈ [−5.79%, 2.71%]), with overall error magnitude and dispersion reduced to RMSE₍rel₎ ≈ 18% and σ₍rel₎ ≈ 18%. The melanopic/photopic (M/P) ratio remains stable (∼ 9–10% errors). Errors increase with distance from the windows. Limitations include a single room, short overcast monitoring, and ambiguity in two reported GHI series. The results show that scaling transmittance alone is an effective approach to reduce bias in <em>Eᵥ</em> and <em>EML</em> while preserving spectral balance.

本仓库包含对应博士章节《模拟室内光谱日光模型校准》的相关数据与代码。

项目摘要：本章节提出并验证了一套面向室内光谱日光模拟的实用校准流程。该流程旨在考量三类外部不确定性来源——即（1）太阳-天空光照条件、（2）建筑外部及周边遮挡物、（3）窗户光谱透射率——且仅针对第三类来源开展校准工作。通过在多伦多大学一间教室内开展的短期原位实测，将<em>Radiance</em> v6.0 模拟得到的18通道辐照度与实地实测数据进行对比，并对透射率光谱进行缩放校准。经多方案比对测试，模拟结果与实测数据的光谱形态吻合度优异（皮尔逊相关系数<em>r</em> ≈ 0.89–0.92）；最优校准方案对应的室内窗口相关平均绝对误差MAE₍room,w₎为0.0093 W·m⁻²。校准完成后，对照传感器的明视觉照度与黑视素照度系统偏差已基本消除（相对平均偏差误差MBE₍rel₎ ∈ [−5.79%, 2.71%]），整体误差幅值与离散度分别降至相对均方根误差RMSE₍rel₎ ≈ 18%、相对标准差σ₍rel₎ ≈ 18%。黑视素/明视觉照度比（M/P）保持稳定，误差约为9%~10%。误差随测点与窗户的间距增大而升高。本研究存在一定局限性：仅针对单一间教室开展实验、仅完成了短期阴天工况下的监测，且两份已公开的全球水平辐照度（Global Horizontal Irradiance, GHI）序列存在歧义。研究结果表明，仅通过缩放透射率光谱，即可在保留光谱平衡特性的同时，有效降低明视觉照度<em>Eᵥ</em>与黑视素照度<em>EML</em>的系统偏差。