The objective of this paper was to estimate the volume of a secondary forest located in the Chanchamayo valley by means of a volume equation as a function of crown diameter from the information captured by a remotely piloted aircraft system (RPAS). With the digital RGB camera of the RPAS, photographs of the secondary forest were taken with a 90% overlap between them. The flights were made at different heights, selecting the photographs taken at 100 m above ground level. With them, photomosaics were made, in which a sample of 50 trees whose crowns were visible was taken. These trees were measured in the field, obtained dbh, diameters at different heights, stem height and crown radius. The stem volume of each tree was calculated with the Smalian formula. With the data, it was determined that there are no significant differences between the crown diameters calculated in the field and those ...