Special Issue (Hydraulic Engineering)Paper
A STUDY ON THE IMPACT OF SOIL MOISTURE DISTRIBUTION ON AMSR SOIL MOISTURE ESTIMATION
2025 Volume 81 Issue 16 Article ID: 24-16030
Details
2025 Volume 81 Issue 16 Article ID: 24-16030
The AMSR satellite microwave radiometer provides single-value soil moisture estimates, but it doesn't show how soil moisture is distributed within its footprint (FP), which could be useful information for users. To address this, we created a soil moisture map with a 100-meter resolution using Sentinel-1 SAR data. We then analyzed how the soil moisture distribution within the FP relates to the AMSR soil moisture estimates.
Our study found two key points: 1. When the AMSR soil moisture estimate is below 10%, the variation in soil moisture within the FP is small. The difference between the 75th and 25th percentiles is generally less than 4%. 2. When the AMSR soil moisture estimate is 10% or higher, the soil moisture distribution within the FP shows diverse patterns, making it hard to explain the variation uniformly.
