Gao Qi, Peng Jie, Feng Chunhui, et al. A Study on Inversion for Remote Sensing of Desert Soil Moisture Based on Landsat 8 Data[J]. Bulletin of Soiland Water Conservation, 2021, 41(1): 125-131.
DOI:
Gao Qi, Peng Jie, Feng Chunhui, et al. A Study on Inversion for Remote Sensing of Desert Soil Moisture Based on Landsat 8 Data[J]. Bulletin of Soiland Water Conservation, 2021, 41(1): 125-131. DOI: 10.13961/j.cnki.stbctb.2021.01.018.
A Study on Inversion for Remote Sensing of Desert Soil Moisture Based on Landsat 8 Data
[Objective] The variation characteristics of desert soil moisture were analyzed to provide a theoretical basis and methodology for remote-sensing monitoring of soil water content in the arid desert of Southern Xinjiang Uygur Autonomous Region.[Methods] The desert soil moisture modeling indicators were constructed based on Landsat 8 data. An optimal 26 spectral index
land surface temperature (Ts)
and digital elevation model data (DEM) were selected as modeling factors
and the soil water inversion model was constructed using the partial least squares regression (PLSR)
support vector machine (SVM)
and random forest (RF) algorithms. After model validation and comparison
the spatial distribution of soil moisture in Kongtailike was retrieved using the optimal model.[Results] ① The temperature vegetation dryness index
NR
GLI
and other 26 preferred spectral indices
as well as TS and DEM
were significantly correlated with soil moisture. They could be used as indicators for remote-sensing modeling of desert soil moisture in the arid area of Southern Xinjiang. ② Among the three models
the R2 of calibration and validation based on the RF model were 0.93 and 0.91
respectively
and the RPD of validation was 3.90
which was the highest. The PLSR model accuracy was the second best
and the SVM model accuracy was the lowest. ③ The surface soil moisture in the study area was retrieved by the RF model
and the characteristics of soil moisture distribution in different ground classifications were noticeably different
especially in the salt crust region.[Conclusion] The comprehensive use of spectral index
environmental factors
and terrain factors could result in the inversion of the soil water content in arid areas with a higher accuracy
providing scientific value for the desertification and ecological environment control in this area.
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