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The complex process of fully automatically establishing seamlines for the fast production of high-quality mosaics with high-amountof high-resolution multi-spectral images is detailed and improved in this paper. The algorithm is analyzed and a quasi-linear runtimein the number of considered pixels is proven for all situations. For typical situations the storage is even essentially smaller from acomplexity theoretical perspective. Improvements from algorithm practical perspective are specified, too. The influence of differentmethods for the determination of seamlines based on gradients is investigated in detail for three Sentinel-2 products. The studiedtechniques cover well-known ones normally based on a single band. But also more sophisticated techniques based on multiple bandsor even taking additional external geo-information data are taken into account. Based on the results a larger area covered byImage2006 orthorectified products with data of the Resourcesat-1 mission is regarded. The feasibility of applying advancedsubordinated methods for improving the mosaic such as radiometric harmonization is examined. This also illustrates the robustnessof the improved seamline determination approaches

TOWARDS FAST MORPHOLOGICAL MOSAICKING OF HIGH-RESOLUTION MULTI-SPECTRAL PRODUCTS – ON IMPROVEMENTS OF SEAMLINES