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We study the integral Galactic extinction and reddening based on the galaxycatalog of the South Galactic Cap U-band Sky Survey (SCUSS), where $u$ bandgalaxy number counts and $u-r$ color distribution are used to derive theGalactic extinction and reddening respectively. We compare these independentstatistical measurements with the reddening map of \citet{Schlegel1998}(SFD)and find that both the extinction and reddening from the number counts andcolor distribution are in good agreement with the SFD results at low extinctionregions ($E(B-V)^{SFD}<0.12$ mag). However, for high extinction regions($E(B-V)^{SFD}>0.12$ mag), the SFD map overestimates the Galactic reddeningsystematically, which can be approximated by a linear relation $\Delta E(B-V)=0.43[E(B-V)^{SFD}-0.12$]. By combing the results of galaxy number counts andcolor distribution together, we find that the shape of the Galactic extinctioncurve is in good agreement with the standard $R_V=3.1$ extinction law of\cite{ODonnell1994}.

The Galactic extinction and reddening from the South Galactic Cap U-band Sky Survey: u band galaxy number counts and $u-r$ color distribution