The 2007 International Geoscience and Remote Sensing Symposium was held in Barcelona, Spain, July 23-27, 2007. The theme of this years symposium was “Sensing and Understanding Our Planet .” The goal of this year’s symposium was to report on the advances in understanding the basics of earth processes such as climate, ecology, and hydrology to identify factors to be measured in remote sensing. Understanding and sensing our planet encompasses remote sensing scientists and engineers that work on technological advances and earth science researchers who investigate the earth science processes.