Submitted to: Proceedings of SPIE
Publication Type: Proceedings
Publication Acceptance Date: July 15, 2006
Publication Date: August 16, 2006
Citation: Jackson, T.J. 2006. Validation of satellite-based soil moisture algorithms. In: Proceedings of SPIE Atmospheric and Environmental Remote Sensing Data Processing and Utilization II: Perspective on Calibration/ Validation Initiatives and Strategies, August 16-18, 2006, San Diego, California. 6301:63010D1-6. Technical Abstract: Validation is an important but particularly challenging task for passive microwave remote sensing of soil moisture from Earth orbit. The key issue is spatial scale; conventional measurements of soil moisture are made at a point whereas satellite sensors provide an integrated area/volume value for a much larger spatial extent. For microwave remote sensing from space it is necessary to consider the kilometer to 40 km scale, which presents new challenges. This issue of spatial scale is common to both current and future satellite missions. Regardless of the degree of difficulty, ground based sampling must remain a core component of validation. An integrated approach using in situ networks, field campaigns and comparison to other satellite products is described.