Vienna 2008: Investigation of Light Pollution in the Republic of Croatia 1
Investigation of Light Pollution in
the Republic of Croatia
Željko Andreić1, Doroteja Andreić, Ana Bonaca, Korado Korlević, Petra Korlević, Mirna Kramar
Višnjan Education Center, Istarska 5, 51463 Višnjan, Croatia
1speaker, permanent address: Faculty of Mining, Geology and Petroleum Eng., University of Zagreb, Pierottijeva 6,
10 000 Zagreb, Croatia, E-mail: [email protected]
Vienna 2008: Investigation of Light Pollution in the Republic of Croatia 2
Overview
1. Introduction
2. A short history of our efforts in Croatia
3. LP monitoring methods
4. Modeling
5. Results and conclusions
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Croatia
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A short history of our activities
1992: first popular articles about LP
1998: Višnjan obs. starts to discover
new asteroids
2001: LP blocks Visnjan obs.
asteroid program after approx 1350
discoveries
2002-3: first attempts to measure LP
in Istria
2006--: systematic measurements
and modelling
2002.
2003.
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A short history of our activities 2 (2006-7)
10%
40%30%
20%
fireflies live only here
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Monitoring methods: Sky quality meter
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Monitoring methods: all-sky cameras
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Satellite imaging (Cinzano at al.)
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Satellite imaging + modelling (Cinzano at al.)
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Statistical model (M. Walker 1966.-1977.)
Population cenzus + Walker's law:
D N
Ad_Bright=const×N×D-2,5
Ad_Bright??
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Shadowing correction (Albers et al. 2001)
corr = exp-(h/A)
typically, A = 4000 m
h
A
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Statistical model versus satelite imaging model
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LP map of Croatia
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LP map of
Croatia
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Results: "top 10" in Croatia
20,520,420,810. Japetić vrh
20,519,520,89. Kanfanar
19,520,420,98. Novigrad podravski
21,020,921,07. rt Kamenjak
21,020,921,06. Savičenta
20,520,921,15. Tičan
20,520,421,14. Japetić kamenolom
21,520,921,33. Vela Luka suburb
21,520,921,32. Korenica
21,521,721,81. Lastovo
Cinzano et al. prediction
model prediction
SQM measurement
location
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Results: "top 10" in Croatia
1
2
3
4,10
567
8
9
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Conclusions
1. Walker's model and satelite imaging model are in agreement,
but Walker's model provides better resolution and is easier to
construct.
2. SQM is unusable near open lights, SQM-L is much beter in this
aspect. Measurements in rural areas in agreement with models,
SQM is very simple to use.
3. Places with minimum LP limited to southern Adriatic islands,
Llika and Gorski kotar and a few small spots far from cities in
other areas.