决策树分类提取宁夏耕地复种指数  

Decision Tree Classification for Extraction of Ningxia Multiple Cropping Index

作　　者：王连喜 章婷[1,2] 李琪 吴东丽 陈夏[1,2] 

机构地区：[1]江苏省农业气象重点实验室,南京210044 [2]南京信息工程大学江苏省大气环境与装备技术协同创新中心,南京210044 [3]中国气象局气象探测中心,北京100081

出　　处：《遥感信息》2018年第1期45-50,共6页Remote Sensing Information

基　　金：公益性行业(气象)科研专项(GYHY201506001);吉林省气象局青年基金项目(2014006)

摘　　要：针对运用Savitzky-Golay滤波处理的增强型植被指数曲线会出现伪峰或将真实峰去掉的情况,对复种指数的提取造成误差的问题,提出一种基于ENVI软件的决策树分类法快速准确提取宁夏复种指数的分析方法。在对2009年和2010年中等分辨率MOD13Q1的EVI进行预处理后,进行SG滤波法重构时间序列曲线,然后利用TIMESAT软件的TSF_seas2img功能模块提取宁夏植被的关键物候信息,最后基于物候信息运用决策树分类,分离出宁夏一年一熟及一年两熟的作物面积。对提取的结果利用高分辨率的2009年Landsat-5TM影像以及统计年鉴提供的数据进行了验证。结果表明,宁夏主要种植方式为一年一熟,少量的一年两熟区域大多集中于固原市。基于关键物候信息提取宁夏复种指数的精度较高,能够比较准确地反映宁夏复种作物信息,表明中分辨率遥感影像在提取复种指数方面也能发挥积极作用,丰富了复种指数的分析,也为该方面的研究与应用提供了参考。The use of Savitzk-Golay filtering EVI（enhanced vegetation index）curve will appear spurious peaks or the real peak removed,which causes the error in the extraction of multiple cropping index. In this paper, a decision tree classification method based on ENVI software is proposed for the rapid and accurate analysis of the multiple cropping index in Ningxia. After preproeessing the 2009 and 2010 medium resolution MOD13Q1 EVI, reconstruct the time sequence curve by SG filtering method,then utilize the TSF_seas2img TIMESAT software function module to extract the key Ningxia vegetation phenology information. Finally,use the decision tree classification to isolate the crop area of Ningxia one year one ripe and two crops a year. The results are verified by using high resolution Landsat-5 TM images in 2009 and the statistical yearbook data. The results show that the main cropping system in Ningxia is one year one ripe,and a small amount of a year two cooked areas are mostly focused on the natural Guyuan city. The extraction of Ningxia multiple cropping index based on the key phenology information has higher accuracy,which can accurately reflect the Ningxia double-cropping information, showing that moderate resolution remote sensing image can also play a positive role in extracting multiple crop index.

关 键 词：物候信息 EVI 决策树分类 SG滤波 复种指数 

分 类 号：S127[农业科学—农业基础科学] TP79[自动化与计算机技术—检测技术与自动化装置]