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In the international practice of green infrastructure research, many indicators have been developed to measure the social functions, naturalness, the role of the urban climate, interconnection, networking, multifunctionality, and ecosystem services. In 2007, an indicator of biological activity value (BA) was introduced into the Hungarian town planning practice and legislation, which shows the intensity of green areas in areas to be built and is the basis for counting land use changes of settlements. However, the actual biomass, which can be measured by remote sensing devices, has not yet been considered in determining the indicator values. The main purpose of this research was to develop an easy-to-use, easily adaptable indicator for spatial and settlement planning, which has good correlation with the green coverage of different land uses and with biomass; and which may be also suitable for monitoring the ecological value of land use changes.