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

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