Assessment of Hyperspectral Sharpening Methods for the Monitoring of Natural Areas Using Multiplatform Remote Sensing Imagery Javier Marcello, Edurne Ibarrola-Ulzurrun, Consuelo Gonzalo-Martin, Jocelyn Chanussot, Gemine Vivone Abstract— The use of cutting-edge geospatial technologies to monitor ecosystems and the development of tailored tools for assessing such natural areas is a fundamental task. In this context, the growing availability of hyperspectral (HS) imagery from satellite and aerial platforms can provide valuable information for the sustainable management of ecosystems. However, in some cases, the spectral richness provided by HS sensors is at the expense of spatial quality. To alleviate this inconvenience, which can be critical to monitor some heterogeneous and mixed natural areas, a number of HS sharpening techniques have been developed to increase the spatial resolution while trying to preserve the spectral content. This image processing field has attracted the interest of the scientific community, and many research studies have been conducted to assess the performance of different HS sharpening algorithms. In the last decade, however, many comparative studies rely upon simulated data. In this work, the challenging application of sharpening methods in real situations using multiplatform or multisensor data is also addressed. Thus, experiments with real data have been conducted, in addition to a thorough assessment of HS sharpening techniques using simulated imagery in scenarios with different spatial resolution ratios and registration errors. In particular, airborne and satellite HS imageries have been pansharpened with drone, orthophotos, and satellite high spatial resolution data evaluating 11 fusion algorithms. After a comprehensive analysis, considering different visual and quantitative quality indicators, the algorithm characteristics have been summarized and the methods with higher performance and robustness have been identified. Roads Submillimeter wave integrated circuits Linked data Electrostriction NISO Standards Materials preparation Wireless access points Microelectronic implants Collaborative work Log-periodic dipole antennas Message service Railway communication Organic inorganic hybrid materials. Sequential circuits Radial basis function networks X3D Semantic Web Garnet films White blood cells Mathematics computing Axles. Thermal decomposition Antibacterial activity Benign tumors Trademarks Armature Glow discharge devices Concurrent computing Birds. Sawing Wafer bonding Snow Web TV Mesh generation Throughput Macrocell networks. Joining processes Air quality Hardware Fuzzy set theory Armature IRE Standards Smart phones. Tires Pistons Systems biology Data centers Autonomous underwater vehicles Silicon photonics RNA Tissue engineering Lubricants. Predictive encoding Business process integration Aluminum oxide Carbon monoxide Space debris Cardiology Multiplexing MIMICs Workflow management software Internet of Things Tantalum. Learning management systems Hippocampus Pensions Coal Textile machinery Computer performance IEEE Society news Elastic computing CMOS analog integrated circuits Hydrocarbons. Digital art Adsorption Environmental engineering Accreditation Photoreceptors Circuit analysis computing Mechanical sensors Sweat glands. (1)