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针对传统的农田灌溉面积提取方法单一且费时费力的问题,提出基于遥感地表温度反演及植被供水指数(VSWI)的方法对石津灌区农作物的灌溉面积进行了提取。在利用Landsat 8影像提取灌溉面积的同时通过高分1号影像提取的小麦种植结构对灌溉区域进行了约束,从而减少了其它地物对灌溉面积提取的影响。结果显示,两种方法计算得到的灌溉区域重叠率达87%,同时将利用遥感方法提取的灌溉结果与实地调查的结果相比较,发现在灌溉时间和面积上具有较好的一致性,因此认为所得结果较为可靠。该方法不仅可以快速、高效的获取到较高精度的灌溉面积数据,同时大大减少了外业工作量,因此可以为农业灌溉区域的调查和监测提供有效的技术支撑。
Aiming at the problem of single and time-consuming traditional method of irrigated area extraction, this paper proposes to extract irrigated area of crops in Shizhen irrigation area based on remote sensing of surface temperature and vegetation water supply index (VSWI). Irrigation areas were constrained using Landsat 8 image extraction irrigated area while the wheat cropping structure extracted from highscore 1 image reduced the impact of other landforms on irrigation area extraction. The results show that the overlap rate of irrigation area calculated by the two methods is 87%, comparing the results of field survey with remote sensing, and found that there is good consistency in irrigation time and area, so that The result is more reliable. The method not only can obtain the high-precision irrigation area data quickly and efficiently, but also greatly reduces the workload of the field, so it can provide effective technical support for the investigation and monitoring of the agricultural irrigation area.