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IPO-light

IPO-light. Marian van Asten Henk Spoelstra Wim Schmidt Richard Schmidt Wim Gerritsen. Development and applications of a light pollution calculation tool 11 th Dark Sky Symposium Osnabrück October 7, 2011. Dutch provinces and light pollution. 12 regional authorities

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IPO-light

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  1. IPO-light Marian van Asten HenkSpoelstra Wim Schmidt Richard Schmidt Wim Gerritsen Development and applications of a light pollution calculation tool 11th Dark Sky Symposium Osnabrück October 7, 2011

  2. Dutch provinces and light pollution • 12 regional authorities • Growing concern about light pollution among civilians, social stakeholders and politicians • Our role is diverse: raising awareness, licensing, spatial development, motorway authority, … • Focus Utrecht: landscape, nature and physical environment IPO-Light

  3. Regional authority – regional scale • Night sky brightness • Horizon visibility Sometimes: • Disturbance IPO-Light

  4. Prediction and interpretation? • IPO (Association of the Dutch provinces) commissioned for a calculation tool: IPO-Light • How does this affect humans and animals? • Effect of new development? (e.g. residential area, road, business or industrial area) • Effect of mitigating measures? (e.g. installing better focussed or dimmed lighting) IPO-Light

  5. regional road, lighting at both sides planned residential area water ap. ap. protected ecological area 50 m Applications of tool (1) IPO-Light

  6. industrial area 500 m regional road protected landscape highway city Applications of tool (2) IPO-Light

  7. Design process of the tool Characteristics Light sources & areas Study of Light sources & areas Tables with Sky brightness-distance for light source & area Atmospheric transmission and scattering calculations IPO-Light

  8. Light sources and areas • Modular : areas of 100m x 100m • Categories: • Residential/ City centers • Sporting fields • Business /retail / industrial areas • Roads • Greenhouses • Characteristic light source areas in the Netherlands IPO-Light

  9. Characteristics - 1 • Determination of key figures • Amount of illuminated surface (%) • Roads (width), Residential areas (roads) • Sporting fields and greenhouses (% illuminated) • Business/industrial areas (roads and non-builded areas) • Illumination (selected) • Number, type, illuminance, height • Other illumination (advertising) • Amount of reflection Green and water 30% IPO-Light

  10. Characteristics - 2 • Shielding by buildings • Type of residential areas (houses, apartment blocks and city centers): ratio height houses and width streets • Sporting fields (tennis) IPO-Light

  11. Design process of the tool Characteristics Light sources & areas Study of Light sources & areas Tables with Sky brightness-distance for light source & area Atmospheric transmission and scattering calculations IPO-Light

  12. Input • Each source area (100x 100m) calculated with: • Characteristics of the light sources • Standard amount of fixtures • E.g. : Streets: 4 per 100m, Roads 1 per 30m, sporting fields: depending on type of sport • Standard amount of illuminated ground surface • E.g Roads, industrial & residential areas, sporting fields • Shielding by buildings • Standard reflection (100%) • Atmospheric transmission and scattering IPO-Light

  13. Transmission and scattering S Brightness-distance tables D IPO-Light

  14. Functioning of the tool IPO-Light Area’s & light sources Observation points Characteristics Light sources & areas User choice • Results: • Sky Brightness mcd/m2 • Horizon Visibility Tables with Sky brightness-distance for light source & area Existing environmental software platform GeoMilieu IPO-Light

  15. An imaginary case … Town 30.000 inhabitants Surface 12 km2 Planning new residential area Protected area IPO-Light

  16. IPO-Light … the tool IPO-Light

  17. Sky brightness … present situation 0.88 mcd/m2 1.74 mcd/m2 0.2 mcd/m2 IPO-Light

  18. Sky brightness … Future situation 1.82 mcd/m2 1.54 mcd/m2 0.2 mcd/m2 IPO-Light

  19. Sky brightness … After taking measures 1.77mcd/m2 0.95 mcd/m2 0.2 mcd/m2 IPO-Light

  20. Horizon visibility IPO-Light

  21. What it can • Contribution of lighting to sky brightness • in mcd/m2 • Number of visible stars • Intensity of light sources (horizon visibility) • in 5 classes (very bright -> not visible) IPO-Light

  22. Possible future developments • More meteorological conditions (> 1) • More choices within sources areas: • More types of fixtures • Layout and type of source areas • True measured sky brightness for the all of the Netherlands (now about 50% coverage) • Sky glow in all directions (now only zenithal) IPO-Light

  23. http://www.monitoringportaal.nl/index/2438/Resultaat.html IPO-Light

  24. Thank you for your attention Questions ?

  25. More information IPO-Light

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