A comparative analysis of five global cropland datasets in China

来源 :Science China(Earth Sciences) | 被引量 : 0次 | 上传用户:laojiawolai
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Accurate information of cropland area and spatial location is critical for studies of national food security, global environmental change, terrestrial ecosystem geophysics and the geochemical cycle. In this paper, we compared five global cropland datasets in circa 2010 of China from in terms of cropland area and spatial location, including Global Land30, FROM-GLC, Glob Cover, MODIS Collection 5, and MODIS Cropland. The results showed that the accuracies of cropland area and spatial location of Globe Land30 were higher than the other four products. The cropland areas of the five products varied in most of the provinces. Compared with the statistical data, the best goodness of fit was obtained using Globe Land30, followed by MODIS Collection 5 and FROM-GLC, with MODIS Cropland and Glob Cover having the poorer accuracies. Regarding the spatial location of cropland, Globe Land30 achieved the best accuracy, followed by FROM-GLC and MODIS Collection 5, with Glob Cover and MODIS Cropland having the poorer accuracies. In addition, the spatial agreement of the five datasets was reduced from agricultural production area to pastoral area and significantly affected by elevation and slope factors. Although the spatial resolution of MODIS Collection 5 was the lowest, accuracies of the cropland area and spatial location were better than those of Glob Cover and MODIS Cropland. Therefore, high spatial resolution remote sensing images can help to improve the accuracy of the dataset during land cover mapping, while it is also important to select a suitable classification method. Furthermore, in northwestern and southeastern China, spectral mixing pixels are universal because of the complicated landscape and fragmentized topography and result in uncertainty and poor consistency when using the five products. Therefore, these regions require additional attention in future cropland mapping studies. Accurate information of cropland area and spatial location is critical for studies of national food security, global environmental change, terrestrial ecosystem geophysics and the geochemical cycle. In this paper, we compared five global cropland datasets in circa 2010 of China from terms of cropland area and spatial locations, including Global Land 30, FROM-GLC, Glob Cover, MODIS Collection 5, and MODIS Cropland. The results showed that the accuracies of cropland area and spatial location of Globe Land 30 were higher than the other four products. The cropland areas of Compared with the statistical data, the best goodness of fit was obtained using Globe Land 30, followed by MODIS Collection 5 and FROM-GLC, with MODIS Cropland and Glob Cover having the poorer accuracies. Regarding the spatial location of cropland, Globe Land 30 achieved the best accuracy, followed by FROM-GLC and MODIS Collection 5, with Glob Cover and MODIS Cropland havi In addition, the spatial agreement of the five datasets was reduced from agricultural production area to pastoral area and significantly affected by elevation and slope factors. Although the spatial resolution of MODIS Collection 5 was the lowest, accuracies of the cropland area and spatial location were better than those of Glob Cover and MODIS Cropland. Therefore, high spatial resolution remote sensing images can help to improve the accuracy of the dataset during land cover mapping while it is also important to select a suitable classification method. Further, in northwestern and southeastern China, spectral mixing pixels are universal because of the complicated landscape and fragmentized topography and result in uncertainty and poor consistency when using the five products. Therefore, these regions require additional attention in future cropland mapping studies.
其他文献
颈椎管内肿瘤与颈椎病的鉴别(附9例报告)王鲁博,于夕欣,毕万利1990年2月至1994年11月,我院骨科对318例"颈椎病"患者施行了手术治疗。其中9例为神经纤维鞘瘤误诊为颈椎病,对其中3例按颈椎病施行了手术治
人多水少,缺水已成为制约宁夏固原市原州区经济发展和社会进步的重要因素。基于此,分析原州区水利发展的制约因素,提出水利发展总体布局与主要任务,稳步推进原州区节水型社会
一个词汇,一个句段在不同的语言环境能够发挥不同的作用,教学的最大目的就是让它发挥得淋漓尽致,表现出最大的张力。因此说教学不是教教材而是用教材,教学就是组织学生利用教
定理设D为△ABC的边BC上任一内点,且r、r_1、r_2分别△ABC、△ABD、△ACD内切圆的半 Theorem Let D be any interior point on edge BC of △ABC, and r, r_1, r_2 are △A
我院从1988年1月至1995年8月共收治急性重症胰腺炎102例,手术治疗60例。根据不同术式将病人分为两组。本文对两组手术死亡率及术后并发症的发生率作一比较,以探讨治疗急性重
加气混凝土防水隔热叠合屋面板受力性能的试验研究@田传谦@邓恢义@贺采旭... Experimental Study on Mechanical Performance of Aerated Concrete with Water-proof and Th
酷暑天长途旅行,常有人发生急症,如何进行就地急救呢?虚脱热天,车船里人多,气温高,空气污浊,人容易发生虚脱。症状:突然头晕,眼前发黑,面色苍白,出冷汗,昏迷。遇到这样的病
颅内蛛网膜囊肿的治疗方法探讨济宁医学院附属医院(272111)第四军医大学西京医院伦学庆章翔易声禹费舟1985~1995年,我们收治颅内蛛网膜囊肿(IAC)患者59例。现将其治疗方法介绍并讨论如下。1临床资料1.1一般
企业信息资源微观配置,是指信息资源在单个企业的微观经济个体内的分配,其主要任务是认清组织内各类人员对信息资源的需求,合理组织、协调信息资源的开发利用。企业信息资源
In order to find the dynamic response laws of retaining walls affected by certain earthquake loads,the influence of the seismic wave characteristics and sub-gra