共查询到19条相似文献,搜索用时 156 毫秒
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付晓杰 《中国环境管理干部学院学报》2011,21(2):89-91
空间数据挖掘技术是数据挖掘技术与空间数据库技术的融合,在GIS遥感、图像数据库、医疗影像处理等领域具有广阔的应用前景。基于空间数据挖掘的特点,论述了其在GIS中的应用,指出了空间数据挖掘面临的问题,并阐述了空间数据挖掘的发展趋势。 相似文献
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结合人口普查数据和GIS手段,系统分析了20世纪90年代以来武汉城市圈常住人口空间分布现状特征,揭示了基于圈层法和方向法的空间分布演变趋势,并从政策、经济、人口迁移、交通方面剖析了导致变化的驱动力因素。 相似文献
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基于新发展理念构建制造业高质量发展综合评价体系,运用熵值—TOPSIS模型测度综合指数,结合修正后引力模型与社会网络分析法,对长江经济带制造业高质量发展空间关联结构及其效应进行实证研究。结果表明:(1)长江经济带制造业高质量发展存在显著的空间分异及非均衡分布特征。(2)空间关联结构由“单节点发展模式”演化为“点轴发展模式”,空间溢出效应和辐射带动效应显著。(3)整体网络特征向网状化、稠密化、纵深化发展;个体网络特征显示,上海、南京、苏州等城市为核心扩散点,网络向均衡化和片区化发展,且形成了“由东向西扩展,由沿海向内陆延伸”的“核心-半边缘-边缘”结构特征。(4)时空距离、社会消费品零售总额、制造业从业人员数差异是影响长江经济带制造业高质量发展空间关联结构特征的重要因素。 相似文献
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运用景观生态学的原理与方法,基于GIS技术对芜湖市绿地空间格局特征进行了分析.结果表明,芜湖市绿地景观多样性指数为1.1556、优势度为3.4775、均匀度为0.4977、破碎度为0.4046;城市绿地系统内部景观多样性偏低,优势度明显,类型分布不均,城市绿地生态功能较弱,易受人类活动影响,总体绿地空间布局有待改善. 相似文献
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基于数字城市的理念,将信息技术和社会经济环境(SEE)问题结合起来,将GIS与网络技术相结合,基于GIS空间分析功能中的空间查询和量算功能,提出了城市SEE信息查询系统的框架,实现了城市生态环境及可持续发展基础信息的整理。 相似文献
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分析了成都市突发公共卫生事件应急指挥信息系统的需求,阐述了如何基于数字城市空间信息基础设施,利用网络地理信息系统技术(WebGIS)来整合数字城市信息化资源以及公共卫生专题资源,建设城市突发公共卫生事件应急指挥系统的总体设计和技术实现。 相似文献
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The maintenance of a timely, reliable and accurate spatial database on current forest ecosystem conditions and changes is
essential to characterize and assess forest resources and support sustainable forest management. Information for such a database
can be obtained only through a continuous forest inventory. The National Forest Continuous Inventory (NFCI) is the first level
of China’s three-tiered inventory system. The NFCI is administered by the State Forestry Administration; data are acquired
by five inventory institutions around the country. Several important components of the database include land type, forest
classification and ageclass/ age-group. The NFCI database in China is constructed based on 5-year inventory periods, resulting
in some of the data not being timely when reports are issued. To address this problem, a forest growth simulation model has
been developed to update the database for years between the periodic inventories. In order to aid in forest plan design and
management, a three-dimensional virtual reality system of forest landscapes for selected units in the database (compartment
or sub-compartment) has also been developed based on Virtual Reality Modeling Language. In addition, a transparent internet
publishing system for a spatial database based on open source WebGIS (UMN Map Server) has been designed and utilized to enhance
public understanding and encourage free participation of interested parties in the development, implementation, and planning
of sustainable forest management. 相似文献
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Karl J. C. Harries 《Natural resources forum》1998,22(1):1-13
At common law, the legal nature of a mining royalty between private parties will decide the respective rights of payor and recipient. In some circumstances, it will also determine whether the interest of the recipient will prevail or may be lost and ignored. Industry practices, even those of long standing, that are contrary to the law will not change the law or its effect to meet such concerns. This paper looks at the development of the mining royalty between private parties in Canada and the effect of the realization by recipients that contractual royalties, as opposed to royalties that are interests in the lands or product to which they relate, can be lost in certain circumstances. Suggestions are made for some features that may assist in transforming an otherwise contractual royalty into a real property interest. Some of the concerns for both payor and recipient with respect to the implementation of such suggestions are also discussed.
The article has two appendices attached. Appendix A is an extract from an article by the author discussing the concept of payment of a royalty in kind which is relevant to such suggestions. Appendix B contains some of the more lengthy explanatory notes referred to in the text of the article. 相似文献
The article has two appendices attached. Appendix A is an extract from an article by the author discussing the concept of payment of a royalty in kind which is relevant to such suggestions. Appendix B contains some of the more lengthy explanatory notes referred to in the text of the article. 相似文献
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Assessment of surface water quality of selected estuaries of Malaysia: multivariate statistical techniques 总被引:2,自引:0,他引:2
Multivariate statistical techniques such as cluster analysis (CA), factor analysis (FA) were used for the evaluation of spatial
variations and the interpretation of a large complex water quality data set of two selected estuaries of Malaysia. The two
locations of interest with 10 sites in each location were Kuala Juru (Juru estuary) and Bukit Tambun (Jejawi estuary). Cluster
analysis showed that some sites in both locations have similar sources of pollution from point or non-point sources whereas
FA yielded four factors which are responsible for water quality variations explaining more than 80% of the total variance
of the data set and allowed to group the selected water quality. Correlation analysis of the data showed that some parameters
have strong association with other parameters and they share a common origin source. This study illustrates the usefulness
of multivariate statistical analysis for evaluation and interpretation of complex data sets to get better information about
the pollution sources/factors and understanding the behavior of the parameters in water quality for effective river water
quality management. 相似文献
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Brent Johnson Elizabeth Smith Jerry W. Ackerman Susan Dye Robyn Polinsky Eric Somerville Chris Decker Derek Little Gregory J. Pond Ellen D'Amico 《Journal of the American Water Resources Association》2019,55(1):247-258
Spatial patterns in major dissolved solute concentrations were examined to better understand impact of surface coal mining in headwaters on downstream water chemistry. Sixty sites were sampled seasonally from 2012 to 2014 in an eastern Kentucky watershed. Watershed areas (WA) ranged from 1.6 to 400.5 km2 and were mostly forested (58%–95%), but some drained as much as 31% surface mining. Measures of total dissolved solutes and most component ions were positively correlated with mining. Analytes showed strong convergent spatial patterns with high variability in headwaters (<15 km2 WA) that stabilized downstream (WA > 75 km2), indicating hydrologic mixing primarily controls downstream values. Mean headwater solute concentrations were a good predictor of downstream values, with % differences ranging from 0.55% (Na+) to 28.78% (Mg2+). In a mined scenario where all headwaters had impacts, downstream solute concentrations roughly doubled. Alternatively, if mining impacts to headwaters were minimized, downstream solute concentrations better approximated the 300 μS/cm conductivity criterion deemed protective of aquatic life. Temporal variability also had convergent spatial patterns and mined streams were less variable due to unnaturally stable hydrology. The highly conserved nature of dissolved solutes from mining activities and lack of viable treatment options suggest forested, unmined watersheds would provide dilution that would be protective of downstream aquatic life. 相似文献
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The seminal work of the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services on pollinators, pollination, and food production, informed scientific studies on the understudied impacts of mining on agriculture sub-sectors. This paper assesses the potential impacts of mining activities on beekeeping as an agricultural sub-sector, and the flow-on effects on associated economic values and enterprises to enhance sustainable development. A case study is conducted in the emerging northwest gold mining region of Ghana. The Location Quotient (LQ) and Location Association (La) models are used to explore the economic significance of beekeeping, its spatial links with tree habitats, and mining activities. Geographic Information Systems (GIS) were used to analyze the spatial interactions between concessions, trees, and beekeeping. The paper finds that districts with LQ < 1 in beekeeping also record LQ > 1 in mining, and La < 50 between beekeeping and mining. The findings are useful for stakeholder decision-making toward harnessing and leveraging the prospects of mining on integrated rural and sustainable development. 相似文献
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/ Environmental regulatory agencies are responsible for protecting human health and the environment in their constituencies. Their responsibilities include the identification, evaluation, and cleanup of contaminated sites. Leaking underground storage tanks (USTs) constitute a major source of subsurface and groundwater contamination. A significant portion of a regulatory body's efforts may be directed toward the management of UST-contaminated sites. In order to manage remedial sites effectively, vast quantities of information must be maintained, including analytical dataon chemical contaminants, remedial design features, and performance details. Currently, most regulatory agencies maintain such information manually. This makes it difficult to manage the data effectively. Some agencies have introduced automated record-keeping systems. However, the ad hoc approach in these endeavors makes it difficult to efficiently analyze, disseminate, and utilize the data. This paper identifies the information requirements for UST-contaminated site management at the Waste Cleanup Section of the Department of Environmental Resources Management in Dade County, Florida. It presents a viable design for an information management system to meet these requirements. The proposed solution is based on a back-end relational database management system with relevant tools for sophisticated data analysis and data mining. The database is designed with all tables in the third normal form to ensure data integrity, flexible access, and efficient query processing. In addition to all standard reports required by the agency, the system provides answers to ad hoc queries that are typically difficult to answer under the existing system. The database also serves as a repository of information for a decision support system to aid engineering design and risk analysis. The system may be integrated with a geographic information system for effective presentation and dissemination of spatial data. 相似文献
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Ali Jabr Alawi 《Natural resources forum》1992,16(2):151-153
On 22 May 1990 the Yemen Arab Republic and Peoples Democratic Republic of Yemen were unified to form the Republic of Yemen, with a population of about 14 million people in an area of about 580 000 km2 . The Republic of Yemen is hoping to develop its mineral industry. Possessing a well established geological database plus a newly issued mining law and investment law, Yemen is inviting all investors, whether from the Yemeni private sector or foreign companies, either solely or in joint ventures to investigate opportunities in minerals and construction and industrial materials. 相似文献