  We present the Galactic model parameters for thin disc estimated by Sloan
Digital Sky Survey (SDSS) data of 14 940 stars with apparent magnitudes
$16<g_{o}\leq21$ in six intermediate latitude fields in the first Galactic
quadrant. Star/galaxy separation was performed by using the $SDSS$ photometric
pipeline and the isodensity contours in the $(g-r)_{0}-(r-i)_{0}$ two colour
diagram. The separation of thin disc stars is carried out by the bimodal
distribution of stars in the $(g-r)_{o}$ histogram, and the absolute magnitudes
were evaluated by a procedure presented in the literature Bilir et al. (2005).
Exponential density law fits better to the derived density functions for the
absolute magnitude intervals $8<M(g)\leq9$ and $11<M(g)\leq12$, whereas
sech/sech$^{2}$ laws are more appropriate for absolute magnitude intervals
$9<M(g)\leq10$ and $10<M(g)\leq11$. We showed that the scaleheight and
scalelength are Galactic longitude dependent. The average values and ranges of
the scaleheight and the scalelength are $<H>=220$ pc ($196\leq H \leq 234$ pc)
and $<h>=1900$ pc ($1561\leq h \leq 2280$ pc) respectively. This result would
be useful to explain different numerical values claimed for those parameters
obtained by different authors for the fields in different directions of the
Galaxy.
