Radiometric calibration and evaluation of ultracam X and XP using portable reflectance targets and spectometer data. Aplication to estract thematic data from imagery gathered by the national plan of aerial orthophotography (PNOA)

Abstract

Digital photogrammetric cameras obtain multispectral images with a high geometric accuracy and radiometric information which can be used for multiple purpose. The optimal use of this information requires a calibration and validation of the photogrammetric systems. Calibration is the process of defining the sensor response quantitatively to a known and controlled input signal.