温度反演和植被供水指数的农田灌溉面积提取

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。

Extraction of farmland irrigated area based on temperature inversion and VSWI

Aiming at the problem that traditional method of irrigation area extraction was simple,laborious and time-consuming,the methods of land surface temperature inversion and vegetation water supply index (VSWI)based on remoting sensing was proposed to extract the crops of the irrigation area.When the irrigation area was extracted by using Landsat 8 images,the wheat planting structure which extracted by GF-1 was used to constrained the irrigation area,to reduce the impact of other surface features on the irrigation area extraction.The results showed that the overlap rate of irrigation area calculated by the two methods was 87％.And the results obtained by remote sensing methods and the results of the field survey were compared,they were consistent with the irrigation time and the area,so the result was eliable.This method could not only fast and efficient access to the irrigation area data with high accuracy,while greatly reduced the workload of field,so it could provide effective technical support for the investigation and monitoring of agricultural irrigation area.