(Remote sensing monitoring methods of actual effective irrigation area based on Perpendicular Drought Index (PDI)
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Abstract:
Irrigation area and the accurate information of its distribution are very important for the modern management of irrigation area，while the traditional way to get irrigated area cannot meet the present needs. Satellite remote sensing has provided a relatively inexpensive, accurate, rapid, large-scale, and effective way by which nationwide survey irrigated area can be repeated and distributed. In recent years, more and more satellite remote sensing data sources have provided, and data quality has improved. Using remote sensing technology in the modern management of the irrigation area is the trend of the future. This paper investigated the feasibility of monitoring the drought index of remote sensing for irrigation, and built a remote sensing monitoring model for irrigation area based on drought index difference threshold. Taking the Qinhan Irrigated Area in Ningxia Province as a research area, the application research of the model was carried out. The environmental mitigation satellite (HJ1A / 1BCCD) data were selected to calculate and analyze the distribution and change of the Perpendicular Drought Index (PDI) of the study area of. The difference threshold was 0.082 by on-the-spot investigation of local conditions. Then the first spring irrigation and its changes over time scales of irrigated area were calculated. Compared and verified with the ground monitoring and statistical data, the accuracy of result could reach above 75%. The paper provided a new approach for irrigation area monitoring.
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