The work presents a new methodic procedure of phytometric data processing. This procedure is demonstrated on a concrete research programme elaborated for black locust (Robinia pseudacacia L.) in the Slovak Republic. The program system "DENISA" provides a dynamic model of data collecting, processing, evaluation and storing through a computer system SM 4/20. The project is based on destruction analyses of sample trees while an in-built system for a repeated parameter calculation at an optional interval carries out data modelling in a required time and space configuration.