HY-1C CZI与Sentinel-2 MSI的海岸带植被信息提取差异研究  

Study on the Difference of Vegetation Information Extraction in Coastal Zone of HY-1C CZI and Sentinel-2 MSI

作　　者：李黎 王嘉芃 俞建康 林明森[4] 张登荣[1,2] Li Li;Wang Jiapeng;Yu Jiankang;Lin Mingsen;Zhang Dengrong(Institute of Remote Sensing and Earth Sciences,Hangzhou Normal University,Hangzhou 311121,China;Zhejiang Provincial Key Laboratory of Urban Wetlands and Regional Change,Hangzhou 311121,China;Zhejiang Natural Resources Collection Center,Hangzhou 310007,China;National Satellite Ocean Application Service,Ministry of Natural Resources,Beijing 100081,China)

机构地区：[1]杭州师范大学遥感与地球科学研究院,杭州311121 [2]浙江省城市湿地与区域变化研究重点实验室,杭州311121 [3]浙江省自然资源征收中心,杭州310007 [4]自然资源部国家卫星海洋应用中心,北京100081

出　　处：《科技通报》2022年第3期20-30,共11页Bulletin of Science and Technology

基　　金：国家重点研发计划项目(NO.2016YFB0501404);生态环境遥感调查研究项目(编号:ZJMY(采)2019211)。

摘　　要：为探究HY-1C CZI与Sentinel-2 MSI对海岸带植被信息提取差异,以杭州湾、莱州湾和大亚湾为研究区,将研究区划分为城市和密林两个区域,计算归一化植被指数NDVI和植被覆盖度FVC,对比CZI、MSI的NDVI统计信息和相关性,分析FVC分级面积占比和时空分布异同。结果显示:CZI与MSI在大亚湾与莱州湾的NDVI均值十分接近,但CZI在杭州湾有大量近饱和像元,城市区和密林区分别相对MSI高估0.189和0.183;CZI与MSI在不同样区的NDVI均值线性拟合效果优良,R;最高达到0.98;CZI的FVC与MSI的FVC在不同覆盖等级占比、植被覆盖水平差异、高-低分布趋势三个方面呈现出相似性,在杭州湾地区具有相近的时间分布特征,但CZI的FVC在所有城市平原区及中北部海岸带的高山密林区均有高估现象。综合来看,HY-1C CZI整体可满足我国中等尺度海岸带植被监测需求,在植被变化监测方面有较大潜力。In order to explore the differences between HY-1 C CZI and Sentinel-2 MSI in vegetation extraction abilities in coastal zone, we selected Hangzhou Bay, Laizhou Bay and Daya Bay as the research areas,and the research areas are divided into urban plain and dense forest functional areas. We calculated the normalized vegetation index(NDVI) and fractional vegetation coverage(FVC), compared the statistical information and correlation of NDVI bewteen CZI and MSI,and analysed the proportion of classified area of FVC. The results indicates that: the NDVI mean values of CZI and MSI in Daya Bay and Laizhou Bay are very close, but there are a lot of near saturated pixels in Hangzhou Bay, and the urban area and dense forest area are overestimated by 0.189 and 0.183, respectively;the linear fitting effects of NDVI of four land use types are good, R2 are up to 0.98;the FVC of CZI and the FVC of MSI show strong consistency in three aspects: the proportion of different coverage classes, the difference of vegetation coverage level between North and south, and the high low distribution trend of different functional areas. In Hangzhou Bay area, they present similar time distribution trends, but the FVC of CZI is overestimated in the urban plain area and the dense forest area of the north central coastal zone. Generally speaking, HY-1 C CZI can meet the needs of vegetation monitoring in most coastal zones of China, and has great potential in monitoring changes of vegetation.

关 键 词：HY-1C CZI 植被指数 植被覆盖度 海岸带 

分 类 号：P237[天文地球—摄影测量与遥感]