Analysis of databases and other big data has certain specifics. In recent years, we have been studied the consolidation of various plant distribution data to assess diversity and species richness, and use this information for species distribution modeling. The article presents the results of integration of databases on the distribution of vascular plants of Asian Russia, and considers the features of working with various data sets. We have been discussed the possibilities of digitizing plant distribution maps by GIS. It is important to recognize data heterogeneity and precision for better mapping procedures.