Shadow Accrual Maps: Efficient Accumulation of City-Scale Shadows over Time

Fabio Miranda, Harish Doraiswamy, Marcos Lage, Luc Wilson, Mondrian Hsieh, Claudio Silva

Research output: Contribution to journalArticle

Abstract

Large scale shadows from buildings in a city play an important role in determining the environmental quality of public spaces. They can be both beneficial, such as for pedestrians during summer, and detrimental, by impacting vegetation and by blocking direct sunlight. Determining the effects of shadows requires the accumulation of shadows over time across different periods in a year. In this paper, we propose a simple yet efficient class of approach that uses the properties of sun movement to track the changing position of shadows within a fixed time interval. We use this approach to extend two commonly used shadowing techniques, shadow maps and ray tracing, and demonstrate the efficiency of our approach. Our technique is used to develop an interactive visual analysis system, Shadow Profiler, targeted at city planners and architects that allows them to test the impact of shadows for different development scenarios. We validate the usefulness of this system through case studies set in Manhattan, a dense borough of New York City.

Original languageEnglish (US)
JournalIEEE Transactions on Visualization and Computer Graphics
DOIs
StateAccepted/In press - Feb 6 2018

Fingerprint

Ray tracing
Sun

Keywords

  • Buildings
  • Ray tracing
  • shadow accrual maps
  • Shadow accumulation
  • Sun
  • Tools
  • Urban areas
  • urban development
  • visual analysis
  • Visual analytics

ASJC Scopus subject areas

  • Software
  • Signal Processing
  • Computer Vision and Pattern Recognition
  • Computer Graphics and Computer-Aided Design

Cite this

Shadow Accrual Maps : Efficient Accumulation of City-Scale Shadows over Time. / Miranda, Fabio; Doraiswamy, Harish; Lage, Marcos; Wilson, Luc; Hsieh, Mondrian; Silva, Claudio.

In: IEEE Transactions on Visualization and Computer Graphics, 06.02.2018.

Research output: Contribution to journalArticle

@article{340d43b7ea8843f2a620ba34266d7562,
title = "Shadow Accrual Maps: Efficient Accumulation of City-Scale Shadows over Time",
abstract = "Large scale shadows from buildings in a city play an important role in determining the environmental quality of public spaces. They can be both beneficial, such as for pedestrians during summer, and detrimental, by impacting vegetation and by blocking direct sunlight. Determining the effects of shadows requires the accumulation of shadows over time across different periods in a year. In this paper, we propose a simple yet efficient class of approach that uses the properties of sun movement to track the changing position of shadows within a fixed time interval. We use this approach to extend two commonly used shadowing techniques, shadow maps and ray tracing, and demonstrate the efficiency of our approach. Our technique is used to develop an interactive visual analysis system, Shadow Profiler, targeted at city planners and architects that allows them to test the impact of shadows for different development scenarios. We validate the usefulness of this system through case studies set in Manhattan, a dense borough of New York City.",
keywords = "Buildings, Ray tracing, shadow accrual maps, Shadow accumulation, Sun, Tools, Urban areas, urban development, visual analysis, Visual analytics",
author = "Fabio Miranda and Harish Doraiswamy and Marcos Lage and Luc Wilson and Mondrian Hsieh and Claudio Silva",
year = "2018",
month = "2",
day = "6",
doi = "10.1109/TVCG.2018.2802945",
language = "English (US)",
journal = "IEEE Transactions on Visualization and Computer Graphics",
issn = "1077-2626",
publisher = "IEEE Computer Society",

}

TY - JOUR

T1 - Shadow Accrual Maps

T2 - Efficient Accumulation of City-Scale Shadows over Time

AU - Miranda, Fabio

AU - Doraiswamy, Harish

AU - Lage, Marcos

AU - Wilson, Luc

AU - Hsieh, Mondrian

AU - Silva, Claudio

PY - 2018/2/6

Y1 - 2018/2/6

N2 - Large scale shadows from buildings in a city play an important role in determining the environmental quality of public spaces. They can be both beneficial, such as for pedestrians during summer, and detrimental, by impacting vegetation and by blocking direct sunlight. Determining the effects of shadows requires the accumulation of shadows over time across different periods in a year. In this paper, we propose a simple yet efficient class of approach that uses the properties of sun movement to track the changing position of shadows within a fixed time interval. We use this approach to extend two commonly used shadowing techniques, shadow maps and ray tracing, and demonstrate the efficiency of our approach. Our technique is used to develop an interactive visual analysis system, Shadow Profiler, targeted at city planners and architects that allows them to test the impact of shadows for different development scenarios. We validate the usefulness of this system through case studies set in Manhattan, a dense borough of New York City.

AB - Large scale shadows from buildings in a city play an important role in determining the environmental quality of public spaces. They can be both beneficial, such as for pedestrians during summer, and detrimental, by impacting vegetation and by blocking direct sunlight. Determining the effects of shadows requires the accumulation of shadows over time across different periods in a year. In this paper, we propose a simple yet efficient class of approach that uses the properties of sun movement to track the changing position of shadows within a fixed time interval. We use this approach to extend two commonly used shadowing techniques, shadow maps and ray tracing, and demonstrate the efficiency of our approach. Our technique is used to develop an interactive visual analysis system, Shadow Profiler, targeted at city planners and architects that allows them to test the impact of shadows for different development scenarios. We validate the usefulness of this system through case studies set in Manhattan, a dense borough of New York City.

KW - Buildings

KW - Ray tracing

KW - shadow accrual maps

KW - Shadow accumulation

KW - Sun

KW - Tools

KW - Urban areas

KW - urban development

KW - visual analysis

KW - Visual analytics

UR - http://www.scopus.com/inward/record.url?scp=85041511512&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85041511512&partnerID=8YFLogxK

U2 - 10.1109/TVCG.2018.2802945

DO - 10.1109/TVCG.2018.2802945

M3 - Article

JO - IEEE Transactions on Visualization and Computer Graphics

JF - IEEE Transactions on Visualization and Computer Graphics

SN - 1077-2626

ER -