  We study the reconstruction of overdensity maps of galaxies as function of
redshift in the range $0 < \mathrm z < 0.8$ using data from 1-m Schmidt
Telescope of Byurakan Astrophysical Observatory (Armenia) in 16 medium band
$\sim 250$ A and four broad band (u,g,r,i) filters. The data used in this work
homogeneously cover $2.39$ sq. deg with accurate photometric redshiftss, down
to $\mathrm R < 23$ mag (AB). We reconstructed the density contrast maps for
the whole galaxy sample of the HS 47.5-22 ROSAT field in narrow slices for full
range of redshifts. We select groups and clusters of galaxies with adaptive
kernel based on density peaks which are larger than two times the mean density.
The reconstructed overdensity field of galaxies consists of cluster-like
structures outlining void-like regions for full redshift range $0 \leq \mathrm
z \leq 0.8$. We detect known galaxy clusters in this field with software
specially developed for this project. This gives us a possibility to study how
star formation properties and galaxy morphology depend on the environments of
the galaxies in this field.
