In this talk I will present the first results of the LUS (Local Universe Survey) project. The main goals of LUS are to achieve a comprehensive theory of galaxy formation and evolution, an accurate assessment of how and when galaxies form their stellar populations, and how that varies with galaxy parameters and environment. I will present the first observations carried out within the collaboration, centered on a large area of the southwestern region of M101 using the OSIRIS/GTC Tunable Filters. This new observational mode have allowed us to map emission lines such as Ha, the sulphur doublet (SII), and SIII in a very efficient way with respect to typical spectroscopy. I will show also a new tool to reconstruct monochromatic images at specific wavelengths in order to derive the gas properties (star-formation rates (SFRs) and electron densities) in large and extended sources. Altogether, these results demonstrate the power of OSIRIS for studying emission line objects and represent the first study of an extended object covering the full field-of-view using OSIRIS TFs.