The aim of this paper is to highlight the main benefits of using the Qfield app in tree census activity. The advantage of entrusting all of the information to the main GIS platform of the project (master), which is stored inside the PC, means this leaves only the task of checking the collected data, along with the bonus of in-depth topographical and geospatial analysis. We illustrate the results of tree census activity in the state road 67 Tosco-Romagnola (SS 67) that connects Pisa with Marina di Ravenna, particularly in the stretch that connects the towns of Fornacette and Pontedera. Part of this stretch (about 1,.7 km) belongs to the Municipality of Calcinaia with which we are collaborating for the urban tree inventory. This one is straight, has a discontinuous and partly uneven double row of trees of the same species (hackberry), and is subject to high vehicular traffic, even heavy, due to the presence of artisanal and industrial activities. The goal of the work was to evaluate the phytopathological and hazardous conditions and the ecosystem benefits of the trees along this stretch of road in terms of healthy, C02 absorption, particulate matter (PM10) adsorption and shade effect using a GIS opensource app (QFIELD and QGIS).