期刊论文

A method for estimating cropping intensity based on mixed pixel unmixing using time series remote sensing images ———A case study of Hubei Province

中文

华中师范大学学报(自然科学版)

1000-1190

2020

54

1

96-103

10.19603/j.cnki.1000-1190.2020.01.016

国家自然科学基金项目（41971371）； 湖北省自然科学基金项目（2017CFB434）；

本校为第一机构

在耕地总量减少、质量下降与人口持续增长、对粮食需求增加的背景下,耕地集约化利用成为保障国家粮食安全的重要手段.现有耕地集约化利用指标定义主要有种植频率和复种指数等.种植频率是对种植模式的硬划分(如单季或双季),会损失部分信息.复种指数是以统计数据为基础计算得到,忽略了行政区内作物分布状况的空间异质性.该文引入“种植强度”这一概念,实现对耕地集约化利用状况的精细表达.通过分析不同土地覆盖及不同复种状况的耕地在时间序列植被指数上的差异,构建特征空间,利用线性光谱分解的方法在时间维度上进行混合像元分解.以湖北省为研究区估算耕地种植强度,基于湖北省县级尺度和样区像素尺...

Under the background of decreasing quantity and quality of croplands, and increasing demand for food, intensive utilization of croplands palys an important role in national food security. The existing indicators of intensive utilization of cropland mainly include cropping frequency and multiple cropping index. The crop patterns include single cropping and double cropping, which were norminal measurement and will lose some information. The multiple cropping index is calculated based on the statistical data, ignoring the spatial heterogeneity whinin the administrative region. In this paper, the ...