The Application Of Remote Sensing Technology In Irrigation Management

Agriculture is the foundation of the national economy, shouldering the burden of foodsecurity task for securing the population of1.4billion. However, China is a country withserious water shortages. As the industrialization and urbanization everlasting development,the problem of agricultural water shortage is becoming more and more server. Under theincreasing water scarcity and the dual pressures of demand for agricultural products broughtby population growth, promoting water-saving irrigation measures and developing accurateand efficient modern irrigation agriculture will be a long-term task of China’s agriculture.Irrigation district accounts for48%of the arable land, whereas it supplies productionaccounting for80%of total output of grain. As is stable and high yield important, Irrigationdistrict is a cornerstone of agricultural development. On the one hand, in normal yearirrigation lacks water about300,000,000,000m3, which limits the development of agriculture.On the other hand, effective utilization coefficient of irrigation is only0.5, which results in awaste of water resources. The management of agricultural is weak. Irrigation water shortageand waste water are coexisting. Agricultural irrigation water has a great potential of savingwater resources. By accelerating water-saving agriculture, the contradiction of supply anddemand of water resources can be alleviated. This is an important measure to implement themost stringent water management system.Irrigation management is on of important way to implement the most stringent watermanagement system, to achieve high-yield agriculture while saving water. Throughmanagement measurements of water resources, water macro-control at different levels,different times and different spatial can achieve optimal allocation of water resources.Scientific irrigation management is based on the accurate information. This informationincludes all information relating to crops, soil and water resources. However, the traditionalmeans exists to obtain this information difficult to get way less monitoring sites,time-consuming, such as lack of long update cycle, making it impossible to achieve thedynamic water management, irrigation management Irrigation low. As a modern grounddetection technology, remote sensing has covered a wide range of fast, real-time, objectiveand other advantages, providing access to information for irrigated support.Firstly, from the significance and application of irrigation management status of remotesensing techniques in irrigation management analysis, elaborates the current management inirrigation districts lack access to information and remote sensing techniques exist with respectto the advantages of traditional irrigation district information acquisition methods in thedomestic application of remote sensing technology in the status quo outside irrigationmanagement systems were introduced. On this basis, for irrigation management in the business needs of the actual irrigated area and irrigation engineering control area wasconstructed based on the actual irrigated area monitoring corrected vertical drought indexdifference between the threshold and based irrigation engineering control area extractionmethods terrain data, and can be operational processes. Select Hetao Irrigation District as aresearch area and choose HJ1A/1BCCD, GF-1, ZY-3and TH-1satellite data as the dataresources. Based on the difference between before and after irrigation in soil moisturecharacteristics indicated by the use of MPDI (Modified Perpendicular Drought Index, MPDI)changes, combined with a small amount of ground survey points, and gain the results ofextraction of the actual irrigated area, which fills the gaps of the actual irrigated area irrigatedon monitoring methods. Moreover, superimposed with crop planting structure the actualirrigation area of different kinds of crop can be get. Based on the results, the progressachieved irrigation can be monitored. Selecting Landsat TM satellite data and QuickBirdsatellite data, it combined the canal with terrain data and take use of the region growingmethod to extract the four areas to achieve a controlled irrigation project area.The results show that the actual irrigated area established remote monitoring and controlof the area to identify irrigation projects of simple operation and an being easy access, canquickly get results. And it can be used as a directly indicator for irrigation management.Furthermore, extraction of crops based on the results of the actual irrigated area, combinedwith the various water-saving irrigation quota irrigated crops, irrigation should also beanalyzed to obtain the amount of irrigated water port traffic monitoring, supporting thesupervision of water-saving irrigation.