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Quantifying the impact of building material stock and green infrastructure on urban heat island intensity

Building and Environment 2025年 280卷

作者： Bao, Yi Huang, Zhou Yin, Ganmin Ren, Shuliang Yan, Xiaoqin Qi, Junnan Institute of Remote Sensing and Geographic Information System Peking University Beijing China Beijing Key Lab of Spatial Information Integration & Its Applications Peking University Beijing China

The urban heat island (UHI) effect has become one of the most critical environmental consequences of urbanization, fundamentally linked to the accumulation of building material stocks and modification of natural surfaces. This study develops a comprehensive quantitative framework to analyze the combined effects of building material stock and green infrastructure on UHI intensity in beijing, China. Using remote sensing data and interpretable machine learning approaches, particularly partial dependence analysis, we reveal the nonlinear relationships and interaction effects between urban physical characteristics and UHI intensity. The results identify a critical threshold of brick material stock at approximately 3×108 tons, beyond which UHI intensity increases sharply. Our findings advance the understanding of urban thermal environment regulation by quantifying both the individual and interactive effects of material stocks and green infrastructure, providing insights for optimizing urban heat mitigation strategies. © 2025 Elsevier Ltd

关键词： Tile

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A unified model of bidirectional reflectance distribution function for the vegetation canopy

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Science China Earth Sciences 2017年第3期60卷 463-477页

作者： XU XiRu FAN WenJie LI JuCai ZHAO Peng CHEN GaoXing Institute of Remote Sensing and Geographic Information System Peking UniversityBeijing 100871China Beijing Key Laboratory of Spatial Information Integration&Its Applications Beijing 100871China

An accurate and operational bidirectional reflectance distribution function （BDRF） canopy model is the basis of quantitative vegetation remote sensing. The canopy reflectance should be approximated as the sum of the single scattering reflectance arising from the sun, pl, and the multiple scattering reflectance arising from the canopy, fin, as their directional characteristics are dramatically different. Based on the existing BRDF model, we obtain a new analytical expression of ρ1 and ρm in this paper, which is suitable for different illumination conditions and different vegetation canopies. According to the geometrical optic model at the leaf scale, the anisotropy of ρ1 can be ascribed to the geometry of the object, sun and the sensor, multiple scale clumping, and the fraction of direct solar radiation and diffuse sky radiation. Then, we parameterize the area ratios of four components： the sunlit foliage, sunlit ground, shadow foliage and shadow ground based on a Poisson distribution, and develop a new approximate analytical single scattering reflectance model. Assuming G=0.5, a recollision probability theory based scattering model is developed which considers the effects of diffuse sky radiation, scattering inside the canopy and rebounds between the canopy and soil. Validation using ground measurements of maize and black spruce forest proves the reliability of the model.

关键词： Vegetation BRDF Unified model Clumping Index Proportion of direct solar radiation and diffuse sky radiation Recollision probability

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A hybrid stock selection model based on forecasting, classification and feature selection

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International Journal of u- and e- Service, Science and Technology 2016年第6期9卷 153-168页

作者： Zhang, Shiliang Chang, Tingcheng Department of Computer science Ningde Normal University Key Lab of Spatial Information Integration and Its Applications Peking University China Institute of Remote Sensing and Geographical Information Systems and Beijing Key Lab of Spatial Information Integration and Its Applications Peking University China

The basic aim of this paper is to provide a model to explain stock performance paramount level. To reach this purpose, this research proposes that rough set theory (RS), allied with the use of Grey Prediction, Semi-Supervised Graph Regularized Non-negative Matrix Factorization (SGNMF), K-means and Grey Relation, can out-perform the more standard approaches that are employed in economics. This study focuses on stock to select the optimal stock portfolio out applying the financial statement datum from the New Taiwan Economy database (TEJ). Firstly, this study collects relative financial ratio datum as the conditional attributes selection and then uses GM(1,1) for forecasting, SGNMF for choosing the more important conditional attributes, and rough set for figuring the best portfolio out. Finally, the Grey relational analysis is used to reduce the investment risk for fund allocation. This study will demonstrate that rough sets model is applicable to stock portfolio. The empirical result in Taiwan: During five years (2009-2013), the average annual rate of return was 20.41%, the accumulated rate of return for 9 quarter was 61.22%. The portfolio determined by the model is a promising alternative to the conventional methods for economic and financial prediction. © 2016 SERSC.

关键词： Forecasting

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Orientation Mechanism Based on Insect Polarization Navigation

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Journal of beijing Institute of Technology 2010年第2期19卷 191-195页

作者：关桂霞陈家斌晏磊吴太夏吴波 School of Automation Beijing Institute of Technology Beijing Key Lab of Spatial Information Integration and Its Applications Peking University Information Engineering College Capital Normal University

A method to determine the direction angle for bionic navigation is proposed. In order to do it, observation models of polarized light were obtained through full-sky imaging polarimetry, and the symmetry line （ solar meridian） was detected firstly; then the angle between solar meridian and the system moving direction was derived from simultaneous model, and the relative position of the sun was calculated by astronomical knowledge ; finally, the direction angle for bionic navigation was evaluated by utilizing sun azimuth to revise the angle between solar meridian and the system moving direction. This study improves previous conception with the changing solar meridian as a reference direction （0°） and provides a theoretic foundation for polarized light to be applied into navigation.

关键词： bionic navigation polarimetry direction angle

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Geometric and automatic mosaic method with collinear equation for aviation twice-imaging data 21

Geometric and automatic mosaic method with collinear equatio...

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21st Congress of the International Society for Photogrammetry and Remote Sensing, ISPRS 2008

作者： Yan, Lei Gou, Zhi-Yang Zhao, Shi-Hu Su, Mao-Di Beijing Key Lab of Spatial Information Integration and its Applications Peking University Beijing100871 China

Due to more than one hundred of traditional film aerial cameras and too expensive digital ones in China, new type aerial camera with large format becomes the focus of researchers on remote sensing and Photogrammetry in both film and digital aerial camera. The key innovation for this program is twice-imaging proposal. In this paper, a geometric and automatic mosaic method is mainly developed for twice-imaging data. This method is able to efficiently present whole images with large format and high resolution through secondary imaging data during a mapping assignment. Experiments are carried out to validate this method. © 2008 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Photogrammetry

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Human ecosystem prediction control with dynamic state equations

Human ecosystem prediction control with dynamic state equati...

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2012 International Conference on Biomedical Engineering and Biotechnology, iCBEB 2012

作者： Yan, Lei Luo, Bo-Ren Liu, Si-Jie Spatial Information Integration and Its Applications Beijing Key Laboratory Peking University China

ISBN: (纸本)9780769547060

Nowadays, even though countries take measures to control the population, it is reported that the total number of global population has reached 7billion. In 21st century, the human society is still faced with the problems about the unprecedented consumption of material wealth and the unprecedented increase in population [1]. So the researchers should study the dynamic changes of resources and population. In this article, the authors try to build a mathematical model based on the state equation to simulate the dynamic changes of resources and population and to achieve calibration control of resources and population on ecosystem. © 2012 IEEE.

关键词： Ecosystems

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Optimizing segmented trajectory data storage with HBase for improved spatio-temporal query efficiency

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International Journal of Digital Earth 2023年第1期16卷 1124-1143页

作者： Yi Bao Zhou Huang Xuri Gong Yuyang Zhang Ganmin Yin Han Wang Institute of Remote Sensing and Geographical Information Systems Peking UniversityBeiingPeople's Republic of China Beijing Key Lab of Spatial Information Integration&Its Applications Peking UniversityBejjingPeople's Republic of China

The surging accumulation of trajectory data has yielded invaluable insights into urban systems,but it has also presented challenges for data storage and management *** response,specialized storage systems based on non-relational databases have been developed to support large data quantities in distributed ***,these systems often utilize storage by point or storage by trajectory methods,both of which have *** this study,we evaluate the effectiveness of segmented trajectory data storage with HBase optimizations for spatio-temporal *** develop a prototype system that includes trajectory segmentation,serialization,and spatio-temporal indexing and apply it to taxi trajectory data in *** indicate that the segmented system provides enhanced query speed and reduced memory usage compared to the Geomesa system.

关键词： Trajectory storage HBase trajectory segmentation spatio-temporal query

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Simulation study on spectral calibration of hyperspectral imagery based on target absorption features

Simulation study on spectral calibration of hyperspectral im...

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2011 International Conference on Remote Sensing, Environment and Transportation Engineering, RSETE 2011

作者： Gou, Zhiyang Yan, Lei Duan, Yini Yin, Zhongyi Xiang, Yun Beijing Key Lab of Spatial Information Integration and Its Applications School of Earth and Space Science Peking University Beijing China

ISBN: (纸本)9781424491711

Having the advantage of acquiring spatial information and more spectral information, Hyperspectral imager is widely applied in the fields of earth-observation, precision agriculture, etc. In order to improve the quantitative ability of hyperspectral imagery, accurate radiometric and spectral calibrations are necessary. Shifts in channel center wavelengths and changes in spectral resolution may occur when an instrument is transported, fixed, tested before flight, as well as experience vibrations, changes in instrument temperature and pressure on board. As a result, beside laboratory calibration, on-board calibration is necessary for acquiring the detector's actual center wavelengths and spectral resolution. This paper proposes a simulation study on spectral calibration method of hyperspectral imager, whose spectrum covers visible and near-infrared band, using man-made target with spectral absorption feature. The experiment result shows that this method can be applied in on-board spectral calibration to improve the quantitative studies on hyperspectral imagery. © 2011 IEEE.

关键词： Spectral resolution

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Effects on measurement precision caused by degradation of the reference panel long-term used

Effects on measurement precision caused by degradation of th...

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2nd International Workshop on Earth Observation and Remote Sensing applications, EORSA 2012

作者： Ma, Yu-Zhong Duan, Yi-Ni Chen, Wei Yang, Bin Yan, Lei Institute of Remote Sensing Beijing Key Lab of Spatial Information Integration and Its Applications Peking University Beijing 100871 China

ISBN: (纸本)9781467319461

Reference panel has to be used in the circumstances of measuring the reflectance of ground object by field spectroradiometer. The reference panel is normally regarded as reference standard during the process of field spectrometry. its stability directly affects the accuracy of target ground object reflectance, affects the precision of sensor radiometric calibration, and then affects the accuracy of ground object parameter retrieval. Reference panel is a kind of material with relatively stable reflectance, and its reflectance remains stable for certain range of wavelengths. During the process of synchronous or quasi synchronous measurement outdoor, because of long-term using of reference panel in the field, its uniform reflective characteristics has been degraded unavoidable due to some inner and outer reasons to some extent. On these occasions, it becomes vitally necessary to detect the reflective characteristics of degraded reference panel timely. This paper focuses on the degradation degree of the reference panel long-term used in the field and its effect on measurement precision through corresponding experiments. © 2012 IEEE.

关键词： Reflection

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Moving object detection based on bionic compound eye

Moving object detection based on bionic compound eye

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2014 International Conference on Materials Science and Computational Engineering, ICMSCE 2014

作者： Wang, Xiao Meng Yan, Lei Qian, Xu Luo, Boren Jing, Xin Beijing 100083 China Beijing Key Lab. Of Spatial Information Integration and Its Applications Peking University Beijing 100871 China

ISBN: (纸本)9783038350996

In view of the traditional image difference method for camera movement under the condition of low accuracy on moving target detection, the image difference method based on bionic compound eye moving target detection algorithm was proposed and optimized. It used the image difference method based on bionic compound eye to detect the moving targets, and optimize the result by pixel interpolation and the ratio. The experimental conclusions show that the accuracy about new motion detection method is 25% higher than the traditional method. © (2014) Trans Tech Publications, Switzerland.

关键词： Motion analysis

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