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: zandreic@rgn.hr

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

Vienna 2008: Investigation of Light Pollution in the Republic of Croatia 3

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.