Validation of Multiple Soil Moisture Products over an Intensive Agricultural Region: Overall Accuracy and Diverse Responses to Precipitation and Irrigation Events
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area and In Situ Observations
2.2. Soil Moisture Products and Data Preprocessing
2.3. In Situ and Triple Collocation-Based Validations
2.4. Evaluating the Capabilities of Precipitation and Irrigation Detection
3. Results
3.1. Overall Performance of SM Products
3.2. Specific Behaviors of SM Products
3.3. TC-Based Comparison of SM Products
3.4. Diverse SM Responses to Precipitation Events
3.5. Diverse SM Responses to Irrigation Events
4. Discussion
4.1. Practices for Optimal Product and Algorithm Selection
4.2. Implications for Improving the Retrieval Algorithm
4.3. Recommendations for Validation of Soil Moisture Products
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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No. | Latitude | Longitude | Elevation | Land Cover | Water Fraction | Mean SM (cm·cm−3) |
---|---|---|---|---|---|---|
1 | 34.45°N | 116.33°E | 44.2 m | Cropland | Low | 0.170 ± 0.081 |
2 | 33.79°N | 115.73°E | 37.0 m | Cropland | Low | 0.230 ± 0.067 |
3 | 33.49°N | 116.20°E | 29.3 m | Cropland | Low | 0.227 ± 0.108 |
4 | 33.93°N | 116.75°E | 31.6 m | Cropland | Low | 0.188 ± 0.091 |
5 | 33.28°N | 116.55°E | 27.1 m | Cropland | Low | 0.193 ± 0.103 |
6 | 33.14°N | 117.87°E | 16.6 m | Cropland | High | 0.317 ± 0.028 |
7 | 32.64°N | 116.24°E | 24.6 m | Cropland | Low | 0.310 ± 0.049 |
8 | 32.44°N | 116.79°E | 25.7 m | Cropland | High | 0.276 ± 0.122 |
9 | 32.86°N | 117.55°E | 24.6 m | Cropland | Low | 0.293 ± 0.034 |
10 | 32.13°N | 118.29°E | 31.5 m | Cropland | Low | 0.328 ± 0.041 |
11 | 32.46°N | 118.46°E | 35.0 m | Cropland | Low | 0.390 ± 0.034 |
12 | 31.68°N | 115.88°E | 95.4 m | Forest | High | 0.319 ± 0.025 |
13 | 31.40°N | 116.34°E | 86.4 m | Forest | Low | 0.301 ± 0.052 |
14 | 31.28°N | 117.29°E | 20.2 m | Cropland | Low | 0.307 ± 0.077 |
15 | 31.72°N | 118.36°E | 22.5 m | Cropland | High | 0.231 ± 0.070 |
16 | 31.57°N | 118.49°E | 23.2 m | Cropland | High | 0.307 ± 0.107 |
17 | 31.08°N | 118.18°E | 26.8 m | Forest | Low | 0.184 ± 0.107 |
18 | 30.30°N | 118.13°E | 193.4 m | Forest | Low | 0.243 ± 0.081 |
19 | 30.88°N | 118.32°E | 34.9 m | Forest | Low | 0.268 ± 0.067 |
20 | 30.68°N | 118.41°E | 56.0 m | Forest | Low | 0.356 ± 0.022 |
SM Products | Resolution | Depth | Source | Time | Category |
---|---|---|---|---|---|
AMSR2 LPRM X/C1/C2 | 25 km | <2 cm | NASA | 1:30 a.m./1:30 p.m. | RS |
AMSR2 JAXA | 25 km | <2 cm | JAXA | 1:30 a.m./1:30 p.m. | RS |
AMSR2 NPD | 25 km | <2 cm | NASA | 1:30 a.m./1:30 p.m. | RS |
AMSR2 SCA | 25 km | <2 cm | NASA | 1:30 a.m./1:30 p.m. | RS |
SMOS L3 | 25 km | <5 cm | ESA | 6 a.m./6 p.m. | RS |
SMOS IC | 25 km | <5 cm | INRA-CESBIO | 6 a.m./6 p.m. | RS |
SMAP SCA-H/V/DCA | 36 km | <5 cm | NASA | 6 a.m./6 p.m. | RS |
CYGNSS | 36 km | <5 cm | UCAR/CU | daily at 8 a.m. | RS |
MetOp-B ASCAT | 25 km | <2 cm | EUMETSAT | 9:30 a.m./9:30 p.m. | RS |
ESA CCI | 0.25° | <5 cm | ESA | daily at 8 a.m. | RS + Model |
GLDAS Noah | 0.25° | 0–10 cm | NASA | subdaily at 8 a.m. | Model |
MERRA2 | 0.5° × 0.625° | 0–5 cm | NASA | hourly at 8:30 a.m. | Model |
ERA5 | 0.25° | 0–7 cm | ECWMF | hourly at 8 a.m | Model + RS |
ERA5 Land | 0.1° | 0–7 cm | ECWMF | hourly at 8 a.m | Model |
SMAP L4 | 9 km | 0–5 cm | NASA | subdaily at 9:30 a.m. | Model + RS |
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Fan, X.; Lu, Y.; Liu, Y.; Li, T.; Xun, S.; Zhao, X. Validation of Multiple Soil Moisture Products over an Intensive Agricultural Region: Overall Accuracy and Diverse Responses to Precipitation and Irrigation Events. Remote Sens. 2022, 14, 3339. https://doi.org/10.3390/rs14143339
Fan X, Lu Y, Liu Y, Li T, Xun S, Zhao X. Validation of Multiple Soil Moisture Products over an Intensive Agricultural Region: Overall Accuracy and Diverse Responses to Precipitation and Irrigation Events. Remote Sensing. 2022; 14(14):3339. https://doi.org/10.3390/rs14143339
Chicago/Turabian StyleFan, Xingwang, Yanyu Lu, Yongwei Liu, Tingting Li, Shangpei Xun, and Xiaosong Zhao. 2022. "Validation of Multiple Soil Moisture Products over an Intensive Agricultural Region: Overall Accuracy and Diverse Responses to Precipitation and Irrigation Events" Remote Sensing 14, no. 14: 3339. https://doi.org/10.3390/rs14143339