TY - JOUR A1 - Agüera, F. A1 - Carvajal, F. A1 - Pérez, M. T1 - MEASURING SUNFLOWER NITROGEN STATUS FROM AN UNMANNED AERIAL VEHICLE-BASED SYSTEM AND AN ON THE GROUND DEVICE JO - Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci. J1 - ISPRS-Archives VL - XXXVIII-1/C22 SP - 33 EP - 37 Y1 - 2012/09/06 PB - ISPRS SN - 2194-9034 UR - https://isprs-archives.copernicus.org/articles/XXXVIII-1-C22/33/2011/ L1 - https://isprs-archives.copernicus.org/articles/XXXVIII-1-C22/33/2011/isprsarchives-XXXVIII-1-C22-33-2011.pdf DO - 10.5194/isprsarchives-XXXVIII-1-C22-33-2011 ER -