改进垂直干旱指数法在灌溉面积反演中的应用

Application of modified perpendicular drought index method in irrigated area inversion

采用卫星遥感监测手段,以多源多时相遥感数据为基础,以GIS技术为支撑,根据遥感指数对不同土壤土壤湿度响应不同,计算改进的垂直干旱指数,结合现场实际灌溉信息,确定灌溉前后提取阈值,提出一种基于低空间分辨率遥感数据的低成本灌区灌溉面积提取的精确计量技术,补充灌区信息化建设内容,能够快速有效地提高灌区水资源管理的能力。该技术在灌区进行应用,经与地面实测数据对比,精度在0.85左右,可在大中型灌区推广应用。

Using satellite remote sensing monitoring methods,based on multi-source and multi-temporal remote sensing data and supported by GIS technology,according to the different responses of the remote sensing index to different soil moisture,the improved vertical drought index is calculated,and the actual irrigation information is combined to determine the extraction before and after irrigation.This paper proposes an accurate measurement technology for the extraction of low-cost irrigation area in irrigation areas based on low spatial resolution remote sensing data.The technology has been applied in irrigation areas,and its accuracy is about 85%,which can be popularized and applied in other larger and medium-sized irrigation areas.