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The development of regional services able to provide ionospheric verticaltotalelectron content (VTEC) maps and ionospheric indexes with a highspatialresolution, and in near-real-time, are of great importance for bothcivilianapplications and the research community. We provide here themethodolo-gies, and an assessment, of such a system. It relies on the publicGlobalNavigational Satellite Systems (GNSS) infrastructure in South America,in-corporates data from multiple constellations (currently GPS, GLONASS,Galileoand BeiDou), employs multiple frequencies, and produces continen-tal wide VTECmaps with a latency of just a few minutes. To assess theability of our systemto model the ionospheric behavior we performed a year-round intercomparisonbetween our near-real-time regional VTEC maps, andVTEC maps of verified qualityproduced by several referent analysis centers,resulting in mean biases lowerthan 1 TEC units (TECU). Also, the evalua-tion of our products against directand independent GNSS-based slant TECmeasurements shows RMS values better than 1TECU. In turn, ionospheric W-index maps were generated, for calm and disturbedgeomagneticscenarios, solely employing our quality verified VTEC maps. Thespatial rep-resentation of these W-index maps reflects the state of theionosphere, with aresolution of 0.5x0.5 degrees. Finally, we conclude that ourproducts, com-puted every 15 minutes, do provide an excellent spatialrepresentation of theregional TEC, and are able to provide the bases for thepossible computationof ionospheric W-index maps, also in near-real-time

Near-real-time VTEC maps: new contribution for Latin America Space Weather