Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The artificial night sky brightness mapped from DMSP Operational
  Linescan System measurements   We present a method to map the artificial sky brightness across large
territories in astronomical photometric bands with a resolution of
approximately 1 km. This is useful to quantify the situation of night sky
pollution, to recognize potential astronomical sites and to allow future
monitoring of trends. The artificial sky brightness present in the chosen
direction at a given position on the Earth's surface is obtained by the
integration of the contributions produced by every surface area in the
surrounding. Each contribution is computed based on detailed models for the
propagation in the atmosphere of the upward light flux emitted by the area. The
light flux is measured with top of atmosphere radiometric observations made by
the Defense Meteorological Satellite Program (DMSP) Operational Linescan
System.
  We applied the described method to Europe obtaining the maps of artificial
sky brightness in V and B bands.

29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph