SGD-SM: Generating Seamless Global Daily AMSR2 Soil Moisture Long-term Products (2013-2019)

Qiang Zhang1     Qiangqiang Yuan2     Jie Li2     Yuan Wang2     Fujun Sun2     Liangpei Zhang1

1State Key Laboratory of Information Engineering, Survey Mapping and Remote Sensing, Wuhan Univeristy

2School of Geodesy and Geomatics, Wuhan Univeristy

(a) Original (b) Reconstructed

Fig. 1. Original/Reconstructed AMSR2 Global Daily 0.25° Soil Moisture Time-series Products



Dataset Download

download SGD-SM

Link 1: [Baidu Yun] (Extracting Code: fu8f)

Link 2: [Google Drive]

Link 3: [Zenodo]

Related Codes: [GitHub]


Experimental Results

(a) 2019.06.01 (b) 2019.06.15 (c) 2019.06.30

Fig. 2. Original/reconstructing global daily SM results in June, 2019

(a) 2016.10.01 (b) 2016.10.15 (c) 2016.10.30

Fig. 3. Original/reconstructing global daily SM results in October, 2016

(a) 2013.08.01 (b) 2013.08.15 (c) 2013.08.30

Fig. 4. Original/reconstructing global daily SM results in August, 2013



Validation Results

1) In-situ validation:

(a) COSMOS-026 (b) COSMOS-055 (c) COSMOS-098
(d) COSMOS-044 (e) COSMOS-033 (f) COSMOS-076
(g) COSMOS-087 (h) COSMOS-048 (i) COSMOS-012

Fig. 5. Scatters of the in-situ/reconstructed soil moisture values in selected in-situ stations


Table 1. Comparisons between original and reconstructed soil moisture productions

SM Productions Evaluation Index
R RMSE MAE
Original 0.687 0.095 0.078
Reconstructed 0.683 0.099 0.081



2) Time-series validation:


(a) Time-series results in Africa (0.375°N, 36.875°E)
(b) Time-series results in Europe (49.375°N, 35.125°E)
(c) Time-series results in Asia (38.125°N, 117.375°E)
(d) Time-series results in North America (39.875°N, 106.125°W)
(e) Time-series results in South America (15.125°S, 52.625°W)
(f) Time-series results in Australia (30.125°S, 150.375°E)

Fig. 6. Scatters of the in-situ/reconstructed soil moisture values in selected in-situ stations


3) Simulated missing regions validation:


(a) Original result with simulated missing regions (square regions) (b) Reconstructed

Fig. 7. Original and reconstructed results with simulated missing regions in 2019.7.25



(a) Scatter of simulated regions in 2013.7.25 (b) Scatter of simulated regions in 2015.7.25 (c) Scatter of simulated regions in 2017.7.25

Fig. 8. Original-reconstructed scatters of simulated regions in 2013, 2015, and 2017.7.25



References：


Q. Zhang, Q. Yuan, J. Li, Y. Wang, F. Sun, and L. Zhang, “Generating seamless global daily AMSR2 soil moisture (SGD-SM) long-term products for the years 2013-2019,” Earth System Science Data, vol. 13, pp. 1385-1401, 2021.