Submitted to: International Geoscience and Remote Sensing Symposium Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 7/18/2002
Publication Date: 7/18/2002
Citation: Shi, J., Njoku, E.G., Chen, K.S., Jackson, T.J., O'Neill, P. 2002. Estimation of Soil Moisture Change with PAL's L-Band Radiometer. International Geoscience and Remote Sensing Symposium (IGARSS02), June 23-28,2002, Toronto, Canada. III:1393-1395. Interpretive Summary:
Technical Abstract: One advantage of the passive microwave sensors is the quick repeat-time within a few days. Except soil moisture, most of natural surface characteristics, such as surface roughness and vegetation properties, can be reasonable assumed that there is no-change between the repeat measurements (same time during a day) between the data acquisitions. Based on this concept, we demonstrated the relative soil moisture change in terms of the ratio can be directly estimated from the repeat-pass measurements for both bare and vegetated surfaces when the small albedo assumption is valid. The advantage of this technique is that it does not require the surface information - we do not need to know if the pixel is a bare, vegetated, or fractionally vegetated, and vegetation information as long as the small albedo assumption is valid.