Systems and methods are described for synthesis of total surface current vector maps by fitting normal modes to radar data. A method includes extracting a scalar data set from a radar signal from a radar. Velocity components are calculated from the radar signal. The velocity components are fitted to...http://www.google.de/patents/US20030038744?utm_source=gb-gplus-sharePatent US20030038744 - Synthesis of total surface current vector maps by fitting normal modes to single-site HF radar data