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中国被洪水淹没的农田的高分辨率地图绘制

Junliang Qiu¹, Xiankun Yang², Zihao Zheng²

¹Department of Land, Environment, Agriculture and Forestry, University of Padova, Legnaro, 35020, Italy.

Science bulletin

|February 9, 2025

概括

高分辨率地图显示,中国的农田发生了严重的洪水,影响了粮食安全. 这些地图使用Sentinel-1 SAR数据,对于农村地区的防洪和适应战略至关重要.

科学领域:

环境科学环境科学
遥感遥感遥感遥感
农业科学农业科学

背景情况:

气候变化和洪水频率的增加威胁着中国的粮食安全.
准确地绘制被洪水淹没的耕地,对于有效的洪水管理和适应战略至关重要.
以前的洪水绘图因数据稀缺和光学卫星图像云层覆盖而面临限制.

研究的目的:

为中国从2017年到2021年生成高分辨率的被洪水淹没的农田地图.
评估被洪水淹没的耕地范围,包括对大米和玉米作物的具体影响.
提供支持防洪,适应和农村减贫工作的数据.

主要方法:

利用了4968个近乎实时的Sentinel-1合成孔径雷达 (SAR) 图像,空间分辨率为10米.
开发了高分辨率地图,以确定中国农田的淹水地区.
总耕地,大米和玉米作物的量化淹水面积.

主要成果:

耕地占总被洪水淹没面积的43.8%-49.8% (82,175122,037平方公里).
洪水淹没的米面积从8,42822,123平方公里,玉米面积从2,6195,397平方公里不等.
在农村地区观察到广泛的洪水,强调了有针对性的洪水减缓的必要性.

结论:

使用 Sentinel-1 SAR 数据进行高分辨率的洪水绘图对于耕地来说是可行的和准确的.
调查结果强调了农田对洪水的脆弱性及其对粮食安全的影响.
生成的地图可以为基础设施投资和洪水控制和农村发展政策提供信息.

关键词:

洪水地图的绘制.被洪水淹没的农田被淹没了粮食安全粮食安全哨兵-1 探测器的 SAR 系统.

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