Radiometric validation of satellite vegetation indices using flux tower measurements - Jiao Wang; Tomoaki Miura; Anna Kato; Peter D. Blanken; Nathaniel A. Brunsell; Margaret S. Torn (2014 IEEE Geoscience and Remote Sensing Symposium, IGARSS 2014, Quebec City, QC, Canada, July 13-18, 2014, 2014)