RT info:eu-repo/semantics/article T1 Close-range photogrammetry and infrared imaging for non-invasive honeybee hive population assessment A1 Lopez Fernandez, Luis A1 Lagüela López, Susana A1 Pablo, Rodríguez-Gonzálvez A1 José Antonio, Martín-Jimenez A1 Diego, González-Aguilera A2 Ingeniería CartograficaGeodesica y Fotogrametria K1 Cartografía K1 3D reconstruction K1 Computer vision K1 Close-range K1 Photogrammetry K1 Infrared thermography K1 Honeybee AB Close-range photogrammetry and thermographic imaging techniques are used for the acquisition of all the data needed for the non-invasive assessment of a honeybee hive population. Temperature values complemented with precise 3D geometry generated using novel close-range photogrammetric and computer vision algorithms are used for the computation of the inner beehive temperature at each point of its surface. The methodology was validated through its application to three reference beehives with different population levels. The temperatures reached by the exterior surfaces of the hives showed a direct correlation with the population level. In addition, the knowledge of the 3D reality of the hives and the position of each temperature value allowed the positioning of the bee colonies without the need to open the hives. This way, the state of honeybee hives regarding the growth of population can be estimated without disturbing its natural development. PB MDPI YR 2019 FD 2019-07-04 LK http://hdl.handle.net/10612/10996 UL http://hdl.handle.net/10612/10996 NO ISPRS International Journal of Geo-Information NO 16 p. DS BULERIA. Repositorio Institucional de la Universidad de León RD 27-abr-2024