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We estimated the Galactic model parameters for a set of 36 high-latitudefields included in the currently available Data Release 5 (DR 5) of the SloanDigital Sky Survey ({\em SDSS}), to explore their possible variation with theGalactic longitude. The thick disc scaleheight moves from $\sim$550 pc at$120^{\circ}<l<150^{\circ}$ to $\sim$720 pc at $250^{\circ}<l<290^{\circ}$,while the thin disc scaleheight is as large as $\sim$195 pc in the anticenterdirection and $\sim$15% lower at $|l|<30^\circ$. Finally, the axis ratio($c/a$) of the halo changes from a mean value of $\sim$0.55 in the two firstquadrants of the Galaxy to $\sim$0.70 at $190^{\circ}<l<300^{\circ}$. For thehalo, the reason for the dependence of the model parameters on the Galacticlongitude arises from the well known asymmetric structure of this component.However, the variation of the model parameters of the thin and thick discs withGalactic longitude originates from the gravitational effect of the Galacticlong bar. Moreover, the excess of stars in quadrant I (quadrant III) overquadrant IV (quadrant II) is in agreement with this scenario.

Estimation of galactic model parameters in high latitudes with SDSS