The SMAP post-launch Cal/Val activities are intended both to assess the quality of the mission products and to support analyses that lead to their improvement. A suite of complementary methodologies will be employed that will result in a robust global assessment. The specific role that field campaigns play in Cal/Val is to provide detailed information about targeted Cal/Val sites.
Field campaigns are a very important component of the process of validating satellite-based geophysical products. In addition, they can also strengthen collaboration within and across disciplines that can address broader science questions.
The SMAP mission will provide global soil moisture products that will facilitate new science and application areas, while extending those that have developed as a result of its predecessors. The breakthrough that SMAP will provide is significantly higher spatial resolution on a temporally frequent basis. This will be accomplished by integrating active and passive microwave remote sensing. Passive microwave remote sensing of soil moisture has a long history in soil moisture retrieval but faces limits on spatial resolution. Active microwave techniques can provide much higher spatial resolution data but there are challenges in developing a robust soil moisture retrieval algorithm. SMAP will exploit a combination of both techniques to produce an intermediate accuracy and spatial resolution product. In addition to this “flagship” product, SMAP will also provide a standard passive (radiometer-based) soil moisture product and a research active (radar-based) soil moisture product. Level 4 (combined satellite and model) profile soil moisture and carbon products will also be developed.
Primary SMAP Field Campaigns
Soil Moisture Active and Passive Experiments (SMAPEx) -- 2010-2011, New South Wales, Australia.
San Joaquin Valley 2010 Field Campaign (SJV10) -- Summer 2010, California, USA.
Canadian Experiment - Soil Moisture 2010 (CanEx-SM10) -- May 31-June 17, 2010, Saskatchewan, Canada.
SMAP Validation Experiment 2008 (SMAPVEX08) -- Sept 29-Oct 13, 2008, Maryland, USA.
Other Previous Campaigns - Provide useful data for SMAP algorithm development
Cloud and Land Surface Interaction Campaign (CLASIC) -- June 11-July 6, 2007, Oklahoma, USA.
Southern Great Plains Experiment 1999 (SGP99) -- July 8-14, 1999, Oklahoma, USA.