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A Novel Hybrid Method for Measuring the Spatial Autocorrelation of Vehicular Crashes: Combining Moran’s Index and Getis-Ord G<sub>i</sub><sup style='margin-left:-7px;'>*</sup>Statistic 被引量:2
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作者 Azad Abdulhafedh 《Open Journal of Civil Engineering》 2017年第2期208-221,共14页
Spatial autocorrelation is a measure of the correlation of an observation with other observations through space. Most statistical analyses are based on the assumption that the values of observations are independent of... Spatial autocorrelation is a measure of the correlation of an observation with other observations through space. Most statistical analyses are based on the assumption that the values of observations are independent of one another. Spatial autocorrelation violates this assumption, because observations at near-by locations are related to each other, and hence, the consideration of spatial autocorrelations has been gaining attention in crash data modeling in recent years, and research have shown that ignoring this factor may lead to a biased estimation of the modeling parameters. This paper examines two spatial autocorrelation indices: Moran’s Index;and Getis-Ord Gi* statistic to measure the spatial autocorrelation of vehicle crashes occurred in Boone County roads in the state of Missouri, USA for the years 2013-2015. Since each index can identify different clustering patterns of crashes, therefore this paper introduces a new hybrid method to identify the crash clustering patterns by combining both Moran’s Index and Gi*?statistic. Results show that the new method can effectively improve the number, extent, and type of crash clustering along roadways. 展开更多
关键词 spatial AUTOCORRELATION moran’s index Getis-Ord Gi* statistic Vehicle Crashes
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结合均匀度理论和Moran’s I指数、广义G指数的景观格局全局自相关分析 被引量:9
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作者 张玉娟 曲建光 +1 位作者 王强 李丹 《测绘通报》 CSCD 北大核心 2018年第11期36-39,共4页
以塔子沟林场为研究区域,以1997年8月28日和2009年8月25日两期Landsat TM遥感影像为主要数据源,辅助大量非遥感数据,借助ENVI 5.1、Arc GIS 10.3和Geoda095i等软件,将均匀度理论分析方法引入到景观格局空间相关分析中,对研究区域景观格... 以塔子沟林场为研究区域,以1997年8月28日和2009年8月25日两期Landsat TM遥感影像为主要数据源,辅助大量非遥感数据,借助ENVI 5.1、Arc GIS 10.3和Geoda095i等软件,将均匀度理论分析方法引入到景观格局空间相关分析中,对研究区域景观格局全局自相关进行了分析,并与Moran’s I、广义G指数的分析方法获得结论进行了对比。经计算,1997年的景观格局均匀度为0.320 7,介于景观均匀度置信区间[0.297 2,0.339 7],景观格局判定为随机分布,2009年的景观格局均匀度为0.288 3,小于下限值0.296 9,景观格局判定为聚集分布。1997年Moran’s I值为-0.11,景观格局判定为分散分布,2009年Moran’s I值为0.42,景观格局判定为聚集分布。1997年研究区域Z Score值为0.92,2009年研究区域Z Score值为2.06,根据景观格局判别可知,2009年研究区域景观格局呈现出明显的高值空间聚集(H-H聚集),即该期景观格局为聚集分布。结果表明3种分析方法得到的结论相同,即从1997—2009年的12年间,研究区域的格局状况由随机格局到聚集格局变化,说明将均匀度理论分析方法引入到景观格局空间相关分析中是可行的。 展开更多
关键词 景观格局 均匀度 moran’s I 广义G指数 全局自相关
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基于遥感和Moran’s I指数的水稻面积变化空间自相关性研究 被引量:4
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作者 孙玲 单捷 +2 位作者 毛良君 黄晓军 王志明 《江苏农业学报》 CSCD 北大核心 2016年第5期1060-1065,共6页
本研究基于遥感影像获取了2011-2015年江苏省淮安区水稻面积,在乡镇区划和2 km规则网格的基础上,用Moran’s I指数分析了2011-2015年水稻逐年空间变化的相关关系,分析结果表明,淮安区水稻面积变化有聚集现象,2012年有4个聚集区,2013年有... 本研究基于遥感影像获取了2011-2015年江苏省淮安区水稻面积,在乡镇区划和2 km规则网格的基础上,用Moran’s I指数分析了2011-2015年水稻逐年空间变化的相关关系,分析结果表明,淮安区水稻面积变化有聚集现象,2012年有4个聚集区,2013年有3个聚集区,2014年和2015年有6个聚集区;聚集区仅为乡镇行政区划单元的部分区域。 展开更多
关键词 水稻 卫星遥感 moran’s I指数 网格
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基于Moran′s I的林分空间结构量化指标自相关分析 被引量:2
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作者 卿东升 彭进香 +2 位作者 李建军 邓巧玲 刘帅 《林业资源管理》 北大核心 2022年第1期8-17,共10页
为了研究林分空间单元中对象木与相邻木之间在空间结构指标上的自相关性,分析对象林木与相邻木之间在空间中的逻辑关系。在大围山自然保护区、乌云界自然保护区及芦头林场等区域中设置了25块20m×20m的样地,构建了基于Voronoi图的... 为了研究林分空间单元中对象木与相邻木之间在空间结构指标上的自相关性,分析对象林木与相邻木之间在空间中的逻辑关系。在大围山自然保护区、乌云界自然保护区及芦头林场等区域中设置了25块20m×20m的样地,构建了基于Voronoi图的林木空间单元,确定了每株对象林木的相邻木,并选取混交度、开阔比数、胸径大小比及竞争指数作为林木空间结构量化指标,计算了各指标的值,最后结合全局Moran′s I的基本原理构建了林分空间结构单元指标自相关性分析方案,对研究样地中的林分进行分析。结果表明,研究区域的林分为中度混交混交林,该区域的林木之间处于呈中拥挤状态,研究区域内的对象木和其空间单元内的相邻木胸径大小分布差异性较大,林木之间的竞争相对较强。从空间关系上看,研究区域内林木的混交度、开阔比数与其相邻木在空间上呈正相关,在逻辑上表现为聚集;林木的胸径大小比、竞争指数与其相邻木在空间上呈负相关,在逻辑上表现为离散。此外,调研区域中的林木在空间上与其相邻木的关系主要表现为竞争,林分中林木的混交度和竞争指数可能是导致其与周围相邻木存在负相关的主要空间指标。 展开更多
关键词 林分空间结构 林分空间关系 morans I 空间结构量化 自相关性
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Global Mission Sensitivity Study for Phased MissionSystem with Analysis of Variance Method 被引量:1
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作者 吴昕阳 武小悦 《Journal of Donghua University(English Edition)》 EI CAS 2014年第6期809-811,共3页
A comprehensive mission sensitivity analysis index based on Sobol's index called global mission sensitivity( GMS) was proposed in this paper which focused on analyzing the mission sensitivity of components of phas... A comprehensive mission sensitivity analysis index based on Sobol's index called global mission sensitivity( GMS) was proposed in this paper which focused on analyzing the mission sensitivity of components of phased mission systems( PMS). The simulation strategy of GMS based on a Petri net and Monte Carlo method was presented which had broad applicability. Finally,the GMS and Birnbaum's sensitivity of components in a PMS example were compared. The GMS of component is demonstrated to be more adaptable to reflect the component mission sensitivity when the rated reliability parameters of components cannot be obtained, and components have state dependency or the system is subjected to common cause failure. 展开更多
关键词 phased mission system(PMs) global mission sensitivity(GMs) sobol’s index
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Moran’s I指数与DEM网格大小关系的研究
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作者 郤建军 李新通 《海南师范大学学报(自然科学版)》 CAS 2016年第4期418-424,共7页
数字高程模型(Digital Elevation Model,简称DEM)作为真实地形的一种数字化模拟,网格间存在着某种空间自相关性.Moran’s I是一种常见的空间自相关程度量化指标.为了研究Moran’s I与DEM网格大小之间的关系,文章在分辨率为30 m×30 ... 数字高程模型(Digital Elevation Model,简称DEM)作为真实地形的一种数字化模拟,网格间存在着某种空间自相关性.Moran’s I是一种常见的空间自相关程度量化指标.为了研究Moran’s I与DEM网格大小之间的关系,文章在分辨率为30 m×30 m的DEM上随机选取了35个采样点.又以每个采样点为中心,选取n×n(n=3,5,7,…,25)大小的DEM网格,计算并记录对应于每个网格的Moran’s I指数值,绘出各采样点的Moran’s I指数值随n变化的曲线.研究发现:大多数采样点的Moran’s I曲线呈现出一致的变化趋势;同时发现少数采样点的Moran’s I曲线出现局部的变化异常.对这些异常进行分析后发现,Moran’s I值随n变化的趋势与DEM网格高程值的离散程度(地形)有关. 展开更多
关键词 DEM moran’s I指数 网格 空间自相关
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基于CSLE的泛第三极地区土壤侵蚀强度空间分布特征
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作者 刘子玥 章文波 +4 位作者 殷兵 杨勤科 魏欣 刘宝元 殷水清 《水土保持研究》 CSCD 北大核心 2024年第3期1-9,共9页
[目的]定量评估泛第三极地区的土壤侵蚀状况,明确土壤侵蚀的分布特征,以期为土壤侵蚀的科学防治提供依据。[方法]基于分层不等概系统抽样方法,共布设31 406个调查单元。利用中国土壤流失方程CSLE计算泛第三极地区土壤侵蚀速率,并利用莫... [目的]定量评估泛第三极地区的土壤侵蚀状况,明确土壤侵蚀的分布特征,以期为土壤侵蚀的科学防治提供依据。[方法]基于分层不等概系统抽样方法,共布设31 406个调查单元。利用中国土壤流失方程CSLE计算泛第三极地区土壤侵蚀速率,并利用莫兰指数(I)探讨其分布特征。[结果](1)泛第三极地区平均土壤侵蚀速率为162.73 t/(km^(2)·a),水土流失面积比例为7.75%,土壤侵蚀速率超过500 t/(km^(2)·a)的地区主要位于西亚、东亚和南亚;(2)土壤侵蚀存在明显的空间聚集性(I=0.920 9),以高高型和低低型聚集为主,高高型聚集主要分布在西亚北部、南亚北部和西南部以及中国的东北、黄土高原和西藏南部;(3)草地、灌丛和耕地是土壤侵蚀较严重的土地利用类型,其中>1 000 m的草地、>500 m的灌丛和耕地的土壤侵蚀更严重,超过25%的土地都发生了水土流失,平均土壤侵蚀速率变化于426.85~683.72 t/(km^(2)·a)。[结论]海拔介于1 000~6 000 m的草地、500~4 000 m的灌丛以及1 000~4 000 m的耕地是泛第三极地区土壤侵蚀发生的重点区域,需特别关注。 展开更多
关键词 土壤侵蚀 泛第三极 空间分布 莫兰指数
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Examining the Relationship Between Spatial Configurations of Urban Impervious Surfaces and Land Surface Temperature 被引量:3
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作者 WU Xiangli LI Binxia +3 位作者 LI Miao GUO Meixin ZANG Shuying ZHANG Shouzhi 《Chinese Geographical Science》 SCIE CSCD 2019年第4期568-578,共11页
The urban heat island(UHI) effect has significant effects on the quality of life and public health. Numerous studies have addressed the relationship between UHI and the increase in urban impervious surface area(ISA), ... The urban heat island(UHI) effect has significant effects on the quality of life and public health. Numerous studies have addressed the relationship between UHI and the increase in urban impervious surface area(ISA), but few of them have considered the impact of the spatial configuration of ISA on UHI. Land surface temperature(LST) may be affected not only by urban land cover, but also by neighboring land cover. The aim of this research was to investigate the effects of the abundance and spatial association of ISAs on LST. Taking Harbin City, China as an example, the impact of ISA spatial association on LST measurements was examined. The abundance of ISAs and the LST measurements were derived from Landsat Thematic Mapper(TM) imagery of 2000 and 2010, and the spatial association patterns of ISAs were calculated using the local Moran’s I index. The impacts of ISA abundance and spatial association on LST were examined using correlation analysis. The results suggested that LST has significant positive associations with both ISA abundance and the Moran’s I index of ISAs, indicating that both the abundance and spatial clustering of ISAs contribute to elevated values of LST. It was also found that LST is positively associated with clustering of high-ISA-percentage areas(i.e.,>50%) and negatively associated with clustering of low-ISA-percentage areas(i.e.,<25%). The results suggest that, in addition to the abundance of ISAs,their spatial association has a significant effect on UHIs. 展开更多
关键词 impervious surface area URBAN heat IsLAND LAND sruface temperature spatial CONFIGURATION local moran’s I index
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Spatial Quantitative Analysis of Garlic Price Data Based on ArcGIS Technology 被引量:1
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作者 Guojing Wu Chao Zhang +5 位作者 Pingzeng Liu Wanming Ren Yong Zheng Feng Guo Xiaowei Chen Russell Higgs 《Computers, Materials & Continua》 SCIE EI 2019年第1期183-195,共13页
In order to solve the hidden regional relationship among garlic prices,this paper carries out spatial quantitative analysis of garlic price data based on ArcGIS technology.The specific analysis process is to collect p... In order to solve the hidden regional relationship among garlic prices,this paper carries out spatial quantitative analysis of garlic price data based on ArcGIS technology.The specific analysis process is to collect prices of garlic market from 2015 to 2017 in different regions of Shandong Province,using the Moran's Index to obtain monthly Moran indicators are positive,so as to analyze the overall positive relationship between garlic prices;then using the geostatistical analysis tool in ArcGIS to draw a spatial distribution Grid diagram,it was found that the price of garlic has a significant geographical agglomeration phenomenon and showed a multi-center distribution trend.The results showed that the agglomeration centers are Jining,Dongying,Qingdao,and Yantai.At the end of the article,according to the research results,constructive suggestions were made for the regulation of garlic price.Using Moran’s Index and geostatistical analysis tools to analyze the data of garlic price,which made up for the lack of position correlation in the traditional analysis methods and more intuitively and effectively reflected the trend of garlic price from low to high from west to east in Shandong Province and showed a pattern of circular distribution. 展开更多
关键词 GARLIC PRICE DATA analysis moran’s index KRIGING interpolation sPATIAL distribution
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Purchase willingness of new energy vehicles: A case study in Jinan City of China 被引量:3
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作者 Xueqing Tian Qingling Zhang +1 位作者 Yuzhu Chi Yu Cheng 《Regional Sustainability》 2021年第1期12-22,共11页
Speeding up the promotion of new energy vehicles is an important measure to optimize the energy structure,promote energy conservation and emission reduction,and develop the economy sustainability.The research uses a q... Speeding up the promotion of new energy vehicles is an important measure to optimize the energy structure,promote energy conservation and emission reduction,and develop the economy sustainability.The research uses a questionnaire survey to analyze the residents’willingness to purchase new energy vehicles in Jinan Gty of China,and utilizes the binomial logistic regression model and Global Moran's I to explain the impact of three factors(including responden ts'personal characteristics and subjective cognition,products,and social environment)on the purchase willingness of new energy vehicles.According to the survey,75.12%of the responden ts consider buying new energy vehicles in the future,but only 11.66%of the respondents know new energy vehicles well.It can be seen that the respondents in Jinan City generally have an insufficient understanding of new energy vehicles.It may lead to a decline in residents’trust in new energy vehicles,which will in turm affect their purchase willingness.Based on the survey,we find that women who live far from the city center enjoy high incomes and have a low-carbon awareness,generally exhibit a higher willingness to purchase new energy vehicles.Spatial distribution of the purchase willingness has certain aggregation characteristics,showing a positive spatial correlation pattern.Purchase willingness has a certain positive diffusion effect in space,and areas with a higher purchase willingness have a positive driving effect on their surrounding regions.Spatial distribution of the purchase willingness can be used as one of the breakthroughs in promoting new energy vehicles.In addition,safety,price,after-sales service,and infrastruicture of new energy vehicles are important determinants of people's purchase willingness.Among the types of subsidies,financial subsidy is most effective on the residents’purchase wilingness.Our research provides an impor tant information for the promotion of new energy vehicles in the region. 展开更多
关键词 New energy vehicles Purchase willingness Public acceptance global moran’s I Jinan City
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Spatial autocorrelation analysis of 13 leading malignant neoplasms in Taiwan: a comparison between the 1995-1998 and 2005-2008 periods 被引量:1
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作者 Pui-Jen Tsai Cheng-Hwang Perng 《Health》 2011年第12期712-731,共20页
Spatial autocorrelation methodologies, including Global Moran’s I and Local Indicators of Spatial Association statistic (LISA), were used to describe and map spatial clusters of 13 leading malignant neoplasms in Taiw... Spatial autocorrelation methodologies, including Global Moran’s I and Local Indicators of Spatial Association statistic (LISA), were used to describe and map spatial clusters of 13 leading malignant neoplasms in Taiwan. A logistic regression fit model was also used to identify similar characteristics over time. Two time periods (1995-1998 and 2005-2008) were compared in an attempt to formulate common spatio-temporal risks. Spatial cluster patterns were identified using local spatial autocorrelation analysis. We found a significant spatio-temporal variation between the leading malignant neoplasms and well-documented spatial risk factors. For instance, in Taiwan, cancer of the oral cavity in males was found to be clustered in locations in central Taiwan, with distinct differences between the two time periods. Stomach cancer morbidity clustered in aboriginal townships, where the prevalence of Helicobacter pylori is high and even quite marked differences between the two time periods were found. A method which combines LISA statistics and logistic regression is an effective tool for the detection of space-time patterns with discontinuous data. Spatio-temporal mapping comparison helps to clarify issues such as the spatial aspects of both two time periods for leading malignant neoplasms. This helps planners to assess spatio-temporal risk factors, and to ascertain what would be the most advantageous types of health care policies for the planning and implementation of health care services. These issues can greatly affect the performance and effectiveness of health care services and also provide a clear outline for helping us to better understand the results in depth. 展开更多
关键词 sPATIAL AUTOCORRELATION Analysis global moran’s I statistic Local Indicators of sPATIAL Association statistic Logistic Regression Malignant NEOPLAsM TAIWAN
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Theoretical Perspective of Social Entrepreneurship: A Study of Determinants of Social Entrepreneurship in the Context of Saudi Arabia
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作者 Abdulmonem Alzalabani Rajesh S Modi, M 《Journal of Modern Accounting and Auditing》 2013年第4期571-581,共11页
The present paper discusses the different theories on entrepreneurship in general and social entrepreneurship in particular to investigate the different determinants of social entrepreneurship in the context of Saudi ... The present paper discusses the different theories on entrepreneurship in general and social entrepreneurship in particular to investigate the different determinants of social entrepreneurship in the context of Saudi Arabia. The present research is a conceptual study. The data were collected to analyze the entrepreneurship theories in Saudi Arabia's context. The data related to entrepreneurship spirit, perception of society towards entrepreneurship, and other macroeconomic indicators are collected from different research journals, websites of different corporate houses, and government sources to analyze the social entrepreneurship theories, such as failure thesis, interdependence theories, welfare state theory, supply-side theory, entrepreneurship education, etc.. The theoretical hypothesis of interdependence theory, entrepreneurship spirit, and general education and the theoretical analysis of this paper in light of Saudi Arabia are in line with the theory. But the hypothesis generated out of failure thesis theory, welfare state theory, entrepreneurship education, and individualistic and collective society culture is not in line with these theories. 展开更多
关键词 global entrepreneurship monitor (GEM) corporation social responsibility (CsR) Hofstede's index Legatum Prosperity index gross domestic product (GDP)
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Spatial analysis of tuberculosis in four main ethnic communities in Taiwan during 2005 to 2009
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作者 Pui-Jen Tsai 《Open Journal of Preventive Medicine》 2011年第3期125-134,共10页
The aim of the present study was to assess spatial features of tuberculosis prevalence and their relationships with four main ethnic communities in Taiwan. Methods of spatial analysis were clustering pattern determina... The aim of the present study was to assess spatial features of tuberculosis prevalence and their relationships with four main ethnic communities in Taiwan. Methods of spatial analysis were clustering pattern determination (such as global version of Moran’s test and local version of Gi*(d) statistic), using logistic regression calculations to identify spatial distributions over a contiguous five years and identify significant similarities, discriminant analysis to classify variables, and geographically weighted regression (GWR) to determine the strength of relationships between tuberculosis prevalence and ethnic variables in spatial features. Tuberculosis demonstrated decreasing trends in prevalence in both genders during 2005 to 2009. All results of the global Moran’s tests indicated spatial heterogeneity and clusters in the plain and mountainous Aboriginal townships. The Gi*(d) statistic calculated z-score outcomes, categorized as clusters or non-clusters, at at 5% significance level. According to the stepwise Wilks’ lambda discriminant analysis, in the Aborigines and Hoklo communities townships with clusters of tuberculosis cases differentiated from townships without cluster cases, to a greater extent than in the other communities. In the GWR models, the explanatory variables demonstrated significant and positive signs of parameter estimates in clusters occurring in plain and mountainous aboriginal townships. The explanatory variables of both the Hoklo and Hakka communities demonstrated significant, but negative, signs of parameter estimates. The Mainlander community did not significantly associate with cluster patterns of tuberculosis in Taiwan. Results indicated that locations of high tuberculosis prevalence closely related to areas containing higher proportions of the Aboriginal community in Taiwan. This information is relevant for assessment of spatial risk factors, which, in turn, can facilitate the planning of the most advantageous types of health care policies, and implementation of effective health care services. 展开更多
关键词 TUBERCULOsIs Taiwan Residents ETHNICITY global moran’s Test Local Gi*(d) statistic Logistic Regression DIsCRIMINANT Analysis Geographically Weighted Regression
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运用GIS的商品销售时空分布特征分析
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作者 张世良 《宁德师范学院学报(自然科学版)》 2020年第4期371-375,共5页
在分析GIS时空分析技术,利用空间自相关分析方法与核密度估计的基础上,研究商品销售时空分布特征,以福建茶叶销售的地理分布数据为例,研究结果表明,销售分布Moran’s I指数为0.3以上,Z得分大于85,总体上表现为典型的高集聚分布,并可以... 在分析GIS时空分析技术,利用空间自相关分析方法与核密度估计的基础上,研究商品销售时空分布特征,以福建茶叶销售的地理分布数据为例,研究结果表明,销售分布Moran’s I指数为0.3以上,Z得分大于85,总体上表现为典型的高集聚分布,并可以划分为不同等级的热点区域;销售分布点逐渐由沿海城市向内陆城市推移,随时间有着明显的演化和迁移,并由各城市中心向市郊扩散,在市中心表现为显著聚集性.本研究采用自相关分析技术,综合考虑了时间和空间两方面的信息,更完整地表达了销售地理分布的地理学特征,体现了商业信息与地理信息的相关,为其他供应时空分布模式提供了新的视角. 展开更多
关键词 时空分析 moran’s I指数 自相关 核密度
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全国能源消费结构低碳化的空间非均衡性及动态演进
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作者 马海良 高洁 +1 位作者 金瑞琪 江骋宇 《资源与产业》 2024年第1期113-123,共11页
剖析中国能源消费结构低碳化趋势、衡量其空间非均衡状态是推进能源革命及绿色发展的关键环节。文章根据2003—2020年我国各省市能源消费的面板数据,利用泰尔指数和空间自相关法,探究全国能源消费结构低碳化的空间非均衡性及动态演进特... 剖析中国能源消费结构低碳化趋势、衡量其空间非均衡状态是推进能源革命及绿色发展的关键环节。文章根据2003—2020年我国各省市能源消费的面板数据,利用泰尔指数和空间自相关法,探究全国能源消费结构低碳化的空间非均衡性及动态演进特征。结果显示:1)我国能源消费结构低碳化指数总体呈稳步上升的趋势,由2003年的5.298上升至2020年的5.862;2)全国能源消费结构低碳化分布的空间非均衡性较弱,呈现先升后降态势,即泰尔指数总体呈现先上升后下降发展态势,区域间能源消费结构低碳化的差异对总体差异的影响越来越大;3)全国能源消费结构低碳化存在明显的空间正相关,空间集聚效应现象,且近年来总体空间格局分布变化较小。江浙沪地区始终呈现高高聚集的特征,而西南和华中地区则处于弱弱聚集。根据分析结果,提出构建区域利益共同体,通过技术交流等多种方式互惠互助、合作共赢,共同促进能源低碳化发展;推动产业结构高级化,激发社会创造力和市场活力,破解落后高耗能产业的模式锁定和路径依赖;优化能源产业结构,积极推进能源消费转型等政策建议。 展开更多
关键词 能源消费结构 空间非均衡性 动态演进 莫兰指数
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数字经济与工业技术创新发展水平及耦合协调度评价分析 被引量:1
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作者 卢雨 杨力 朱俊奇 《黑龙江工业学院学报(综合版)》 2024年第4期51-57,共7页
选取2012—2021年全国30个省份数据,对数字经济与工业技术创新发展水平、耦合协调度及空间自相关性进行分析。结果表明:(1)2012—2020年期间数字经济和工业技术创新发展水平不断上升,随后一年因受到疫情的冲击导致数字经济发展水平下降... 选取2012—2021年全国30个省份数据,对数字经济与工业技术创新发展水平、耦合协调度及空间自相关性进行分析。结果表明:(1)2012—2020年期间数字经济和工业技术创新发展水平不断上升,随后一年因受到疫情的冲击导致数字经济发展水平下降。(2)我国数字经济与工业技术创新的耦合协调度稳步上升,但是区域和各省份之间存在显著的差异,呈现东部>中部>西部的发展状况。(3)Moran′s Ⅰ指数表明两系统耦合协调度存在显著的空间效应,部分省份存在空间集聚的特征。对此提出了促进数字经济与工业技术创新协调发展的政策建议。 展开更多
关键词 数字经济 工业技术创新 耦合协调 莫兰指数
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未来变化环境下大汶河流域济南段生态流量评价
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作者 侯恩光 冯平 +3 位作者 孙影 林庆辉 褚伟 谭秀翠 《中国农村水利水电》 北大核心 2024年第6期124-131,139,共9页
生态流量是河流生态系统健康稳定的基础,在全球气候变化和人类活动增强的背景下,生态流量受到的影响日益显著。为探究大汶河流域生态流量对未来变化环境的响应,以大汶河流域济南段为研究对象,采用SWAT模型分析未来土地利用和气候情景下... 生态流量是河流生态系统健康稳定的基础,在全球气候变化和人类活动增强的背景下,生态流量受到的影响日益显著。为探究大汶河流域生态流量对未来变化环境的响应,以大汶河流域济南段为研究对象,采用SWAT模型分析未来土地利用和气候情景下径流时空变化规律,评价大汶河水资源调度控制断面陈北、马小庄生态流量保证率,探究其对未来变化环境的响应规律。结果表明:未来变化环境下,大汶河流域济南段土地利用呈现耕地面积减小,城镇面积增大的特点;气候变化呈现降水量增多,温度上升的特点。未来土地利用变化引起径流减少2%,未来气候影响径流减少1%~4%,而两者共同作用,径流减少3%~5%,未来气候变化减弱了降水与径流的相关性。空间上,未来土地利用变化增强径流量空间正相关性,而未来气候变化减弱了径流量的空间正相关性及其显著性水平,且影响径流量空间分布特征。未来土地利用变化对陈北、马小庄流量及生态流量保证率影响较小,而未来气候变化改变了陈北、马小庄流量过程线的形态,将陈北、马小庄生态流量保证率由73%、74%提高到97%、98%,基本生态流量保证率90%以上占比由14%提高至93%。未来土地利用与气候因素中,降水量是陈北、马小庄生态流量保证率的主控因子。研究结果可为大汶河流域生态调度与管理,应对变化环境提供技术支持。 展开更多
关键词 土地利用变化 气候变化 生态流量 sWAT 全局莫兰指数
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公安县新型农民合作社发展水平的影响因素分析
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作者 刘润长 李丽 《武汉理工大学学报(信息与管理工程版)》 CAS 2024年第5期797-802,共6页
新时代县域农民合作社发展是乡村振兴的重要抓手。以公安县为例,构建2017—2022年公安县16个乡镇农民合作社的面板数据,利用空间杜宾模型分析公安县新型农民合作社发展水平的相关影响因素。结果表明:除少数乡镇外,公安县各乡镇农民合作... 新时代县域农民合作社发展是乡村振兴的重要抓手。以公安县为例,构建2017—2022年公安县16个乡镇农民合作社的面板数据,利用空间杜宾模型分析公安县新型农民合作社发展水平的相关影响因素。结果表明:除少数乡镇外,公安县各乡镇农民合作社建设水平与2017年相比总体呈上升态势,且不同地方存在差异化特征;新型农民合作社发展水平的提升及农民合作社的发展具有明显的空间溢出效应,对周边相邻地区也会产生明显的带动效果;入社农民的净收入增长效应指数、合作社引入企业的技术投入程度均能直接或间接影响当地新型农民合作社的发展水平。研究结果可为进一步促进农民合作社建设及区域农村经济发展贡献边际力量。 展开更多
关键词 公安县 农民合作社 影响因素 全局莫兰指数 空间杜宾模型
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西安市生态系统服务价值与生态风险时空演变及其关联分析
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作者 张辉 谢涛 +3 位作者 杨张瑜 邢海波 柴茜 冯恬 《环境生态学》 2024年第7期37-44,共8页
随着城市化进程不断加快,土地利用方式对环境产生重要影响。本研究以ArcGIS 10.8、Fragatats 4.2、GeoDa 1.20、Excel 365软件为支撑平台,以1995年、2000年、2005年、2010年、2015年、2020年等近30年西安市土地利用数据为数据源,基于1 k... 随着城市化进程不断加快,土地利用方式对环境产生重要影响。本研究以ArcGIS 10.8、Fragatats 4.2、GeoDa 1.20、Excel 365软件为支撑平台,以1995年、2000年、2005年、2010年、2015年、2020年等近30年西安市土地利用数据为数据源,基于1 km×1 km评价单元格网研究了近30年西安市生态风险时空变化与生态系统服务价值相关性关系。结果表明:1)近30年土地利用耕地、草地主要流向林地、水域、建设用地,其中林地最多,其次为建设用地,再次为水域;2)近30年西安市生态系统服务价值围绕228.11×10^(8)元上下波动,且提供生态价值由大到小为林地>耕地>水域>草地>未利用地>建设用地;3)近30年西安市景观生态风险变化为先减小后增加的态势,且整体景观生态风险值较低,最大生态风险分别为6.63、2.57、1.24、1.48、1.38、3.58,高生态风险区域集中在林地与水域、草地与林地、水域与耕地交会处;4)西安市生态服务价值与景观生态风险指数呈负相关,负相关斜率分别为-0.142、-0.180、-0.135、-0.246、-0.246、-0.191。本研究旨在为西安市土地利用合理规划及环境治理提供参考。 展开更多
关键词 土地利用 生态系统服务价值 景观生态风险指数 莫兰指数
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基于公交可达性的公共文化设施空间分异研究
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作者 徐学娴 彭玉玲 《测绘与空间地理信息》 2024年第8期22-25,共4页
基于武汉市主城区公共文化设施POI数据、居住小区数据、公交站点数据以及道路网络矢量数据,利用Arc GIS软件的网络分析方法计算公共文化设施可达性,借助Geo Da平台,通过Moran′s I指数探究公共文化设施可达性的空间分异特征。结果表明:... 基于武汉市主城区公共文化设施POI数据、居住小区数据、公交站点数据以及道路网络矢量数据,利用Arc GIS软件的网络分析方法计算公共文化设施可达性,借助Geo Da平台,通过Moran′s I指数探究公共文化设施可达性的空间分异特征。结果表明:居住小区和公共文化设施的公交配给和服务能力均较好,公交出行十分便捷;公共文化设施可达性整体较好,其空间特征为圈层式由中心向四周递减;公共文化设施供给均等化水平较高,可达性空间分布由中心高值集聚区逐渐向四周低值集聚区过渡。 展开更多
关键词 公共文化设施 可达性 空间分异 morans I指数
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