A map of extinction gradients based on data from the Hipparcos catalogue in the directions, defined by the centers of 3888 equal size HealPix areas is presented. Missing data on luminosity classes
of 49542 stars in northern equatorial hemisphere have been restored by linear binary classifier built on
the training set of 39807 stars of the III and V spectral classes. The classifier precisions and recalls are
95% and 89% for the luminosity class III and 91% and 96% for the V class luminosity, respectively.