Measuring Light Pollution with a Calibrated High Dynamic Range - PowerPoint PPT Presentation

May 11, 2023 •183 likes •341 views

Measuring Light Pollution with a Calibrated High Dynamic Range All-Sky Image Acquisition System Georg Zotti Institute of Computer Graphics and Algorithms Vienna University of Technology Outline Sky Luminance and Stellar Visibility High

Measuring Light Pollution with a Calibrated High Dynamic Range All-Sky Image Acquisition System Georg Zotti Institute of Computer Graphics and Algorithms Vienna University of Technology
Outline Sky Luminance and Stellar Visibility High Dynamic Range Photography Evaluation of HDR images Results Georg Zotti 1
Sky Luminance and Stellar Visibility Human Vision Full Moon Sunset Instrument Vision [after Weaver 1947, Garstang 1986, Cinzano 1997] Georg Zotti 2
High Dynamic Range Photography Combination of several exposures Calibration with Luminance Meter � Luminance Map � Photographic Measurement System Georg Zotti 3
Our System Camera: Digital SLR All-Sky Fisheye only with Full-Size Chip DSLRs RAW image format! Free Software: Dcraw for RAW image processing http://cybercom.net/~dcoffin/dcraw/ PFS Tools for HDR processing http://www.mpi-inf.mpg.de/resources/pfstools/ Extensible Calibration: PFS Tools, from EXIF data (approximative) Minolta LS-110 for daylight range Sky Quality Meter for night measurements Georg Zotti 4
Evaluation of Zenith Luminance Series of HDR photos Averaged zenith area � Tonemapped HDR images Georg Zotti 5
Sun alt. Evaluation of Zenith Luminance 6 Georg Zotti cd/m²
Illumination Reduction Evaluation of Zenith Luminance 7 Georg Zotti
Results: Surburb Sky Full illumination Reduced illumination Difference on photographs hard to detect Georg Zotti 8
Results: Surburb Sky Full illumination Reduced illumination Georg Zotti 9
Results: City Border (average) Full illumination Reduced illumination Georg Zotti 10
Results: City Border (good night) Full illumination Reduced illumination Georg Zotti 11
Results: City Border / 20km from Vienna Good site near Vienna , mag6 mag5 Vienna Georg Zotti 12
Results: 20km from Vienna / Desert Good site near Vienna, mag6 Desert Sky (Libya) mag6.5 Camp Vienna Georg Zotti 13
Conclusions All-Sky Luminance Measurement System Calibrated HDR Imaging System Simple extensions to PFS Tools � False-Colour Plots For technical astronomers: mag/arcsec² For visual star watching: limiting visual magnitudes Street light reduction clearly visible Thank you for Your Attention Georg Zotti <gzotti@cg.tuwien.ac.at> Georg Zotti 14

Download Presentation

Download Policy: The content available on the website is offered to you 'AS IS' for your personal information and use only. It cannot be commercialized, licensed, or distributed on other websites without prior consent from the author. To download a presentation, simply click this link. If you encounter any difficulties during the download process, it's possible that the publisher has removed the file from their server.

Recommend

Contents About Avid Nano Dynamic Light Scattering Products Accessories About Avid

Contents About Avid Nano Dynamic Light Scattering Products Accessories About Avid Nano Established in July 2009 Based in High Wycombe, UK Design & manufacture novel DLS DYNAMIC LIGHT SCATTERING Dynamic Light

440 views • 32 slides

Dynamic Light Implementation of Dynamic Lighting Pilot System in Town of akovec Medjimurje

Dynamic Light Final Conference , Germany 26 th 27 th March 2019 Wismar Dynamic Light Implementation of Dynamic Lighting Pilot System in Town of akovec Medjimurje Energy Agency Ltd. MENEA / Town of akovec Alen Vinji, M.Sc. /

723 views • 21 slides

HDR imaging using Deep Learning Mukul Khanna, IIT Gandhinagar HDR High Dynamic Range Dynamic

HDR imaging using Deep Learning Mukul Khanna, IIT Gandhinagar HDR High Dynamic Range Dynamic Range Introduction Common digital cameras can not capture the wide range of light intensity levels in a natural scene. Introduction

1.26k views • 99 slides

HDR Photography Another Tool for the Photographer High Dynamic Range What does it mean?

HDR Photography Another Tool for the Photographer High Dynamic Range What does it mean? Ratio between the maximum & minimum measureable light intensities (white & black) The human eye can see 24 stops, if allowed to adjust for

419 views • 15 slides

Generating Calibrated Ensembles of Physically Realistic, High-Resolution Precipitation Forecast

Generating Calibrated Ensembles of Physically Realistic, High-Resolution Precipitation Forecast Fields Based on GEFS Model Output Michael Scheuerer University of Colorado, Cooperative Institute for Research in Environmental Sciences and

406 views • 30 slides

Pollution Exclusion in CGL Policies Navigating Scope of the Exclusion in Light of Differing Court

Presenting a live 90-minute webinar with interactive Q&A Pollution Exclusion in CGL Policies Navigating Scope of the Exclusion in Light of Differing Court Interpretations THURSDAY, JULY 12, 2012 1pm Eastern | 12pm Central | 11am

638 views • 43 slides

Context 1. Observation (before light pollution) 2. Explanation 3. Model Phaenomena " the

Context 1. Observation (before light pollution) 2. Explanation 3. Model Phaenomena " the things that appear " regular, observable patterns explanation and model: geometric mechanism cause? Observations Time-lapse photograph:

423 views • 19 slides

Curtains, Safety Controller, Measuring Light Curtains Product Line Presentation NORSTAT Safety

& Safety Light Curtains, Muting Light Curtains, Safety Controller, Measuring Light Curtains Product Line Presentation NORSTAT Safety & Automation Program Safety Switches, Limit Switches Safety Light Curtains and Barriers Safety

997 views • 80 slides

6/8/2019 Does traveling to cities with high pollution levels significantly impact cardiopulmonary

6/8/2019 Does traveling to cities with high pollution levels significantly impact cardiopulmonary health and quality of life? Air Pollution and Cardiopulmonary Effects in an International Travel Study Terry Gordon, PhD Ruzmyn Vilcassim, M.S.

322 views • 6 slides

Convex Calibrated Surrogates for Low-Rank Loss Matrices with Applications to Subset Ranking

Convex Calibrated Surrogates for Low-Rank Loss Matrices with Applications to Subset Ranking Losses Harish G. Ramaswamy 1 , Shivani Agarwal 1 and Ambuj Tewari 2 1 Indian Institute of Science 2 University of Michigan Calibrated Surrogates General

381 views • 4 slides

PLURISUBHARMONICITY and PSEUDOCONVEXITY IN CALIBRATED (and other) GEOMETRIES with REESE HARVEY

PLURISUBHARMONICITY and PSEUDOCONVEXITY IN CALIBRATED (and other) GEOMETRIES with REESE HARVEY 1 Complex Geometry: from O or H Many Powerful techniques : also from PSH 2 Other Geometries: Calibrated Geometries Arising, for

542 views • 33 slides

Tab N, No. 4 Shallow Deep LIGHT! No light! Low nutrient- Low nutrient

Tab N, No. 4 Shallow Deep LIGHT! No light! Low nutrient- Low nutrient zooxanthellae Slow growing Dynamic (generally) environment Static environment Temp, salinity, etc. dark, low oxygen, cold 5-12

229 views • 20 slides

Measuring Light d dA (solid angle subtended by ) source dA ' R d

12/6/16 Radiometric Terms Measuring Light d dA (solid angle subtended by ) source dA ' R d (foreshortened area) Lighting r i dA dA (surface area) Surface Irradiance Surface Radiance d 2 = L

493 views • 24 slides

Calibrated Bayes, and Inferential Paradigm for Of7icial Statistics in the Era of Big Data Rod

Calibrated Bayes, and Inferential Paradigm for Of7icial Statistics in the Era of Big Data Rod Little Overview Design-based versus model-based survey inference Calibrated Bayes Some thoughts on Bayes and adaptive design Ross-Royall

484 views • 32 slides

Defining and Measuring Light versus Moderate/Deep Sedation Pratik Pandharipande, MD, MSCI

Defining and Measuring Light versus Moderate/Deep Sedation Pratik Pandharipande, MD, MSCI Professor of Anesthesiology and Surgery Department of Anesthesiology Vanderbilt University School of Medicine VA TN Valley Health Care System Disclosure

428 views • 28 slides

The Calibrated Bayes Factor for Model Comparison Steve MacEachern The Ohio State University

Bayes factors and prior distributions The calibrated Bayes factor OFHS analysis Wrap-up The Calibrated Bayes Factor for Model Comparison Steve MacEachern The Ohio State University Joint work with Xinyi Xu, Pingbo Lu and Ruoxi Xu Supported

548 views • 36 slides

Keystone of the SMART CITY www.reverberi.it The setting of luminous flux today Energy saving:

LTM sensor, Keystone of the SMART CITY www.reverberi.it The setting of luminous flux today Energy saving: Setting of Luminance via Hourly Program According to setted time, luminous flux changes by getting energy saving. Change of luminous

572 views • 44 slides

Dark Sky Lighting and Energy Savings Gary Schroeder RMUE September 26, 2019 1 2003

Dark Sky Lighting and Energy Savings Gary Schroeder RMUE September 26, 2019 1 2003 Northeast Blackout 2 The Energy Cost of Light Pollution 30% of all outdoor lighting is wasted, ending up in the night sky International Dark-Sky

381 views • 26 slides

Angular Embedding: from Jarring Intensity Differences to Perceived Luminance Stella X. Yu

Angular Embedding: from Jarring Intensity Differences to Perceived Luminance Stella X. Yu Computer Science Boston College Acknowledgements: Edward H. Adelson Clare Boothe Luce Professorship NSF CAREER IIS-0644204 IEEE Conference on Computer

373 views • 15 slides

chemistry in DARS Karin Frjd Why DARS? Enabling detailed chemistry in your CAE simulations

Reactive flows and complex chemistry in DARS Karin Frjd Why DARS? Enabling detailed chemistry in your CAE simulations Take the right design choices, including chemical effects Faster and cheaper design cycles Evaluation of

331 views • 14 slides

Two-channel photopic/scotopic luminance meter Optical layout Off-the-shelf optical

Two-channel photopic/scotopic luminance meter Optical layout Off-the-shelf optical components 2 detection channels, weighted by V ( ) and V ( ) respectively Amplifiers: SWIFD (CMI) 2-channel switched integrator amplifier

310 views • 4 slides

DALI-2: New Standards and Mandatory Certification International Trends in Lighting Forum

DALI-2: New Standards and Mandatory Certification International Trends in Lighting Forum & Show Dr. Scott Wade Technical & Certification Manager, Digital Illumination Interface Alliance Sept 26-28, 2017 | Bregenz September 2017 1

547 views • 18 slides

4 Hearn Avenue Interchange Phase 3 Project Status December Project Approval &

4 Hearn Avenue Interchange Phase 3 Project Status December Project Approval & Environmental 2016 - Document Completed January Design Complete 2021 February Ready to List - Construction 2021 Hearn Avenue Interchange Phase 3

352 views • 18 slides

2020 Budget Presentation 1 1 The Strategic Plan is the direction set by Council that guides

2020 Budget Presentation 1 1 The Strategic Plan is the direction set by Council that guides Administration. The Strategic Plan Implementation includes comprehensive coordinated plans detailing the organizational work to achieve the

498 views • 38 slides