  The luminosity function of galaxies of the Early Data Release of the Sloan
Digital Sky Survey (SDSS) and the Las Campanas Redshift Survey (LCRS) is
calculated. The luminosity function depends on redshift, density of the
environment and is different for the Norther and Southern slice of SDSS.
Luminosity functions is used to derive the number and luminosity density fields
of galaxies of the SDSS and LCRS surveys with a grid size of 1 h^{-1} Mpc for
flat cosmological models with \Omega_m=0.3 and \Omega_\Lambda =0.7. We find
that the luminosity function depends on the density of the environment: in
high-density regions brightest galaxies are more luminous than in low-density
regions by a factor up to 5.

Astrophysics