Remote Sensing Area Parc de Montjuïc s/n

Solar-spectrum, passive remote sensing sensors measure mainly the radiance reflected by the atmosphere-ground system. Those images content radiometric distortions that should be corrected to obtain accurate physical measurements, multitemporal series or more realistic colours. After a proper radiometric calibration atmospheric radiative processes remain disturbing the measurement. Orthophotomap series are intended to depict the territory as realistically as possible and the colours of the multi-spectral images do not match the real colours. This is due to the different sensitivity of the sensor versus the Human Visual System (HVS). The Institut Cartografic de Catalunya (ICC) adopts several solutions to overcome it. Multispectral satellite images are atmospherically corrected with a two-step system that links together a semi-empirical method based on a physical model, followed by an empirical method based on normalizing over the time the radiometry of pseudo-invariant areas. Hyperspectral airborne images are corrected by means of the semi-empirical method adapted to the characteristics of the Compact Airborne Spectrographic Imager (CASI) airborne sensor. By 2005, the acquisition of hyperspectral CASI data and the Z/I Digital Mapping Camera (DMC) with field handheld radiometer measurements on Banyoles (Spain) was made. The aim is to validate and improve the algorithms and to enhance the radiometric likely of the DMC and geometric characteristics of the CASI data. Two methodologies are proposed for parameter estimation