TY - JOUR AU - Trang Khoa AU - Pham Duy AU - Tran Tu PY - 2021/08/15 Y2 - 2024/03/29 TI - Correlation between soil moisture content and reflection value of VV polarization, VH polarization of Sentinel-1 satellite: Study case of dragon fruit farm, Binh Thuan province JF - Science & Technology Development Journal: Science of the Earth & Environment JA - STDJSEE VL - 5 IS - 2 SE - Original Research DO - https://doi.org/10.32508/stdjsee.v5i2.555 UR - http://stdjsee.scienceandtechnology.com.vn/index.php/stdjsee/article/view/555 AB - Binh Thuan province is one of the driest provinces in the South Central region in particular and Vietnam in general. The scarcity of water for agriculture in this area in the dry season is very serious. Surface moisture is one of the parameters included in the assessment of aridity. In this study, the authors establish the correlation between VV reflectance value, VH reflectance value extracted from Sentinel-1 satellite image and surface soil moisture collected in the study area. Moisture samples in the field will be taken at a depth of 5cm from the surface in at the same time the Sentinel-1 observation through study area. Samples were taken at 4 different days, each day taking 22 samples and 2 samples for calibrated. Reflectance value VV, reflectance value VH at different times are adjusted according to 2 fixed points corresponding to the place where water is saturated and the surface is the driest in the cultivation area of dragon fruit. Besides, the soil moisture value correlated with the reflectance value of VV and reflectance value of VH in research was compared and compared with similar studies in the world in order to increase the reliability of the data. The results of analysis of moisture samples in the field with humidity values ranging from 13.13% to 61.06%, are correlated with the reflectance value of Sentinel-1 image with R2= 0.926 of VV polarization and R2= 0.956 with VH polarization. ER -