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Managing Road Maintenance Using Geographic Information System Application 利用地理信息系统应用管理道路养护
Pub Date : 2010-10-29 DOI: 10.4236/jgis.2010.24030
M. Yunus, Hamidah Bt. Hassan
The development and economic growth of a nation is closely related to its available transportation system. Good and efficient road transport infrastructure facilities will promote industrial and socio-economic development. To provide safety and comfort to road users, a comprehensive road maintenance schedule must be formulated and adopted to ensure those roads are in good condition at all times. Preventive maintenance works, such as road rehabilitation will help to reduce the major road repairs and expenditure. Prior to this, a good database, gathered through GIS will be necessary in order to ensure maintenance is done effectively. Geographic Information System (GIS) is said to be one of the useful tools that can be utilized to manage database in road maintenance engineering. This system is capable of storing, managing, analyzing, computing and displaying all forms of geographical data for road maintenance works. In this study, the author has adopted GIS application software – ArcView, and has reviewed and analyzed its effectiveness in managing road database. These data are then used to assist the management to ensure effective and systematic road maintenance. A typical model of roads in Penang, Malaysia is used as a case study to further clarify the application of GIS in road maintenance.
一个国家的发展和经济增长与其可用的交通系统密切相关。良好和有效的道路运输基础设施将促进工业和社会经济发展。为确保道路使用者的安全及舒适,我们必须制订和采用全面的道路维修时间表,以确保道路在任何时候都处于良好状态。预防性维修工程,例如道路修复工程,有助减少主要道路维修及开支。在此之前,通过GIS收集的良好数据库将是必要的,以确保有效地进行维护。地理信息系统(GIS)是道路养护工程中可用于数据库管理的有用工具之一。该系统能够存储、管理、分析、计算和显示道路养护工程中各种形式的地理数据。本文采用GIS应用软件ArcView,对其在道路数据库管理中的有效性进行了综述和分析。然后使用这些数据来协助管理人员确保有效和系统的道路维护。以马来西亚槟城的典型道路模型为例,进一步阐明GIS在道路养护中的应用。
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引用次数: 16
Regional Economic Geography with Externalities, Congestion, and Fiscal Policies in a Small-Open Growth Economy 具有外部性、拥塞性和财政政策的小开放增长经济区域经济地理
Pub Date : 2010-10-29 DOI: 10.4236/jgis.2010.24028
Wei-bin Zhang
This paper develops a two-regional growth model with amenity, capital accumulation and regional public goods with public goods and fiscal policies. The economy consists of two regions and each region consists of the industrial sector and public sector. The industrial sector provides goods in perfectly competitive markets. The public sector, which is financed by the regional government’s tax incomes, supplies regional public goods. The public goods affect both firms and households. We show how to find equilibrium values of the dynamic system and simulate model. Then, we carry out comparative statics analysis with regard to parameter changes in tax rates, congestion and amenity. Our comparative statics analysis provides some important insights. For instance, a main difference between the effects of increasing the two regions’ tax rates on the output is that as the technologically advanced region’s (the other region’s) tax rate on the industrial sector is increased, the national industrial output, national capital employed by the economy, and the national wealth are increased (reduced). In the region which increases the tax rate, the wage rate, consumption and wealth per capita, output per labor force, the population, and land rent are increased, and the corresponding variables in the other region are reduced.
本文建立了一个考虑舒适度、资本积累和区域公共产品的两区域增长模型,考虑公共产品和财政政策。经济由两个区域组成,每个区域由工业部门和公共部门组成。工业部门在完全竞争的市场上提供商品。公共部门由地方政府的税收收入提供资金,提供地区公共产品。公共产品对企业和家庭都有影响。我们展示了如何找到动态系统的平衡值和模拟模型。然后,我们对税率、拥堵和舒适的参数变化进行了比较统计分析。我们的比较统计分析提供了一些重要的见解。例如,提高两个地区的税率对产出的影响之间的一个主要区别是,随着技术先进地区(另一个地区)对工业部门的税率提高,国家的工业产出、经济所使用的国家资本和国民财富都增加(减少)了。在提高税率的地区,工资率、人均消费和财富、人均劳动力产出、人口、地租增加,而在其他地区,相应的变量减少。
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引用次数: 2
An Information System for Risk-Vulnerability Assessment to Flood 洪水风险易损性评估信息系统
Pub Date : 2010-07-29 DOI: 10.4236/jgis.2010.23020
S. Karmakar, S. Simonovic, Angela Peck, J. Black
An exhaustive knowledge of flood risk in different spatial locations is essential for developing an effective flood mitigation strategy for a watershed. In the present study, a riskvulnerability analysis to flood is performed. Four components of vulnerability to flood: 1) physical, 2) economic, 3) infrastructure and 4) social; are evaluated individually using a Geographic Information System (GIS) environment. The proposed methodology estimates the impact on infrastructure vulnerability due to inundation of critical facilities, emer gency service stations and bridges. The components of vulnerability are combined to determine an overall vulnerability to flood. The exposures of land use/land cover and soil type (permeability) to flood are also considered to include their effects on severity of flood. The values of probability of occurrence of flood, vulnerability to flood, and exposures of land use and soil type to flood are used to finally compute flood risk at different locations in a watershed. The proposed methodology is implemented for six major damage centers in the Upper Thames River watershed, located in the SouthWestern Ontario, Canada to assess the flood risk. An information system is developed for systematic presentation of the flood risk, probability of occurrence of flood, vulnerability to flood, and exposures of land use and soil type to flood by postal code regions or Forward Sortation Areas (FSAs). The flood information system is designed to provide support for different users, i.e., general public, decisionmakers and water management professionals. An interactive analysis tool is developed within the information system to assist in evaluation of the flood risk in response to a change in land use pattern.
全面了解不同空间位置的洪水风险对于制定有效的流域洪水减灾战略至关重要。在本研究中,进行了洪水的风险脆弱性分析。洪水脆弱性的四个组成部分:1)物质,2)经济,3)基础设施和4)社会;使用地理信息系统(GIS)环境进行单独评估。拟议的方法估计了关键设施、紧急服务站和桥梁被淹没对基础设施脆弱性的影响。脆弱性的组成部分结合起来确定对洪水的总体脆弱性。土地利用/土地覆盖和土壤类型(渗透性)对洪水的影响也被考虑在内,包括它们对洪水严重程度的影响。利用洪水发生概率、洪水易损性、土地利用和土壤类型对洪水的暴露值,最终计算流域不同位置的洪水风险。所提出的方法在位于加拿大安大略省西南部的上泰晤士河流域的六个主要损害中心实施,以评估洪水风险。本署已发展一套资讯系统,按邮政编码地区或前向分拣区系统介绍洪水风险、发生洪水的可能性、易受洪水影响的程度,以及土地用途和土壤类型可能受洪水影响的程度。洪水信息系统旨在为不同的用户,即公众、决策者和水管理专业人员提供支持。资讯系统内发展了一套互动分析工具,协助因应土地用途模式的改变,评估洪水风险。
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引用次数: 74
A Hybrid Approach towards the Assessment of Groundwater Quality for Potability: A Fuzzy Logic and GIS Based Case Study of Tiruchirappalli City, India 基于模糊逻辑和GIS的印度蒂鲁奇拉帕利市地下水饮用水质综合评价方法研究
Pub Date : 2010-07-29 DOI: 10.4236/jgis.2010.23022
N. Kumar, S. Mathew, G. Swaminathan
The present study aims to develop a new hybrid Fuzzy Simulink model to assess the groundwater quality levels in Tiruchirappalli city, South India. Water quality management is an important issue in the modern times. The data collected for Tiruchirappalli city have been utilized to develop the approach. This is illustrated with seventy nine groundwater samples collected from Tiruchirappalli city Corporation, South India. The characteristics of the groundwater for this plain were monitored during the years 2006 and 2008. The quality of groundwater at several established stations within the plain were assessed using Fuzzy Logic (FL) and GIS maps. The results of the calculated FL and GIS maps with the monitoring study have yielded good agreement. Groundwater quality for potability indicated high to moderate water pollution levels at Srirangam, Ariyamangalam, Golden Rock and K. Abisekapurm zones of the study area, depending on factors such as depth to groundwater, constituents of groundwater and vulnerability of groundwater to pollution. Fuzzy logic simulation approach has shown to be a practical, simple and useful tool to assess groundwater quality assessment for potability. This approach is capable of showing and updating the water quality assessment for drinking.
本研究旨在开发一种新的混合模糊Simulink模型来评估印度南部蒂鲁奇拉帕利市的地下水质量水平。水质管理是当今社会的一个重要问题。在蒂鲁奇拉帕利市收集的数据已用于开发该方法。这是用从印度南部蒂鲁奇拉帕利市公司收集的79个地下水样本来说明的。2006年和2008年对该平原的地下水特征进行了监测。利用模糊逻辑(FL)和地理信息系统(GIS)对平原区几个已建立站点的地下水水质进行了评价。计算结果与GIS图与监测研究结果吻合较好。根据地下水深度、地下水成分和地下水对污染的易损性等因素,研究区Srirangam、Ariyamangalam、Golden Rock和K. Abisekapurm带的饮用水水质显示出高至中度污染水平。模糊逻辑模拟方法是一种实用、简单、实用的评价地下水可饮用性的方法。该方法能够显示和更新饮用水水质评价。
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引用次数: 4
GPS- vs. DEM-Derived Elevation Estimates from a Hardwood Dominated Forest Watershed 来自阔叶林流域的GPS与dem的高程估算
Pub Date : 2010-07-29 DOI: 10.4236/jgis.2010.23021
L. Kiser, J. Kelly
Topographic attributes are often used as explanatory variables when providing spatial estimates of various environmental attribute response variables. Elevation of sampling locations can be derived from global positioning systems (GPS) or digital elevation models (DEM). Given the potential for differences in elevation among these two data sources, especially in response to forest canopy cover, our objective was to compare GPS and DEM-derived elevation values during the dormant season. A non-parametric Wilcoxon test indicated GPS elevation was higher than DEM elevation with a mean difference of 6 m. Linear regression analysis indicated that GPS and DEM elevation were well correlated (R2 = 0.71, r = 0.84, p < 0.0001). Although elevation among the two data sources differed, the strong linear relationship allows for correction of elevation values in a predictable manner.
在对各种环境属性响应变量进行空间估计时,通常使用地形属性作为解释变量。采样地点的高程可以通过全球定位系统(GPS)或数字高程模型(DEM)得到。考虑到这两种数据源之间的海拔差异,特别是对森林冠层覆盖的响应,我们的目标是比较GPS和dem在休眠季节的海拔值。非参数Wilcoxon检验表明,GPS高程高于DEM高程,平均差6 m。线性回归分析表明,GPS与DEM高程具有较好的相关性(R2 = 0.71, r = 0.84, p < 0.0001)。虽然两个数据源之间的高程不同,但强线性关系允许以可预测的方式校正高程值。
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引用次数: 4
Contribution of Topographically Explicit Descriptors of Landscape Measures for Application in the Vector Data Environment 景观测量的地形显式描述符对矢量数据环境应用的贡献
Pub Date : 2010-07-29 DOI: 10.4236/jgis.2010.23023
Jomaa Ihab, Y. Auda
Digital terrain models (DTMs) are not commonly used to integrate for landscape spatial analysis. Two dimensional patchcorridormatrix models are prototypes in landscape spatial ecology analysis. Previous studies have motivated ecologists to integrate terrain models in landscape analysis through 1) adjusting areas and distance calculations prior computing landscape indices; 2) designing new indices to capture topography and 3) searching the possible relationship between topographic characteristics and vegetation patterns. This study presents new indices called Relative number of Topographic Faces (RTF) and Simplicity of topographic Faces (STF) that can be easily computed in a GIS environment, capturing topographical features of landscapes. Digital terrain model was first prepared and topographic units were extracted and installed in computing the suggested indices. Mountainous and rugged topography in Lebanon was chosen on a forested landscape for the purpose of this study. The indices were useful in monitoring changes of topographic features on patch and landscape level. Both indices are ecologically useful if integrated in landscape pattern analysis, especially in areas of rugged terrains.
数字地形模型(dtm)在景观空间分析中应用较少。二维拼凑廊道矩阵模型是景观空间生态分析的原型。以往的研究促使生态学家将地形模型整合到景观分析中:1)在计算景观指数之前调整面积和距离计算;2)设计新的指数来捕捉地形;3)寻找地形特征与植被格局之间可能的关系。本研究提出了新的指数,称为相对地形面数(RTF)和地形面简单性(STF),可以在GIS环境中轻松计算,捕捉景观的地形特征。首先建立数字地形模型,提取地形单元并安装在建议指数的计算中。为了进行这项研究,我们选择了黎巴嫩多山和崎岖的地形作为森林景观。这些指数可用于监测斑块和景观水平的地形特征变化。如果在景观格局分析中结合这两个指标,特别是在崎岖地形地区,这两个指标在生态学上都是有用的。
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引用次数: 0
Neotectonic Evidences of Rejuvenation in KaurikChango Fault Zone, Northwestern Himalaya 喜马拉雅西北部KaurikChango断裂带新生的新构造证据
Pub Date : 2010-07-29 DOI: 10.4236/jgis.2010.23024
M. Joshi, G. Kothyari, Arun Ahluvalia, P. Pant
Neotectonic investigations using morphotectonic parameters such as basin asymmetry, drainage anomalies, digital data interpretation and geomorphic field evidences were carried out in Satluj river valley downstream of Khab in the Kaurik Chango Fault (KCF) zone. The study reveals the presence of a northsouth trending fault which is similar to the KCF. Unpaired, tilted terraces, V shaped valleys, deep gorges and lakes are the manifestations of fault movement in the area. Presence of deformation structures preserved in the palaeolake profile at Morang indicates that the area has also been seismically active in the past. In this paper we present a conceptual model of the formation of lakes in KCF zone. Morphometric analysis was carried out with the help of Digital Elevation Models (DEMs) and field investigations.
利用盆地不对称、流域异常、数字资料解释和地貌场证据等形态构造参数,在Kaurik Chango断裂带Khab下游的Satluj河谷进行了新构造调查。研究发现该区存在一条类似于KCF的南北向断裂。不成对、倾斜的阶地、V形山谷、深峡谷和湖泊是该区断层运动的表现。Morang古湖泊剖面中保存的形变构造表明该地区在过去也曾发生过地震活动。本文提出了KCF带湖泊形成的概念模型。借助数字高程模型(dem)和野外调查,进行了形态计量学分析。
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引用次数: 13
Geospatial Mapping of Singhbhum Shear Zone (SSZ) with Respect to Mineral Prospecting 新兴剪切带地质空间填图与找矿
Pub Date : 2010-07-29 DOI: 10.4236/jgis.2010.23025
Bijay Singh Jimly Dowerah
Singhbhum Shear Zone is a highly mineralized zone having variety of minerals, predominantly those of uranium, copper and some sulphide minerals. From Remote Sensing data it is possible to decipher the regional lithology, tectonic fabric and also the geomorphic details of a terrain which aid precisely in targeting of metals and minerals. Mapping of mineralized zones can be done using Geospatial Technology in a GIS platform. The present study includes creation of various maps like lithological map, geomorphological map, contours and slope map using satellite data like IRS LISSIV and ASTER DEM which can be used to interprete and correlate the various mineral prospective zones in the study area. Even the alterations of the prevalent mineral zones can be mapped for further utilization strategies. The present work is based on the investigations being carried under ISROSAC Respond Project (Dept. of Space, Govt. of India SAC Code: OGP62, ISRO Code: 10/4/556).
兴兴剪切带是一个高矿化带,矿物种类繁多,以铀、铜和部分硫化物矿物为主。从遥感数据可以破译区域岩性、构造结构以及地形的地貌细节,这有助于精确定位金属和矿物。利用地理空间技术可以在GIS平台上绘制矿化区。目前的研究包括利用IRS LISSIV和ASTER DEM等卫星数据制作各种地图,如岩性图、地貌图、等高线图和坡度图,这些地图可用于解释和关联研究区内的各种矿产远景区。甚至可以对主要矿产地的变化进行测绘,以供进一步的利用战略之用。目前的工作是基于ISROSAC响应项目(印度政府空间部门SAC代码:OGP62, ISRO代码:10/4/556)下进行的调查。
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引用次数: 8
Double Polarization SAR Image Classification based on Object-Oriented Technology 基于面向对象技术的双偏振SAR图像分类
Pub Date : 2010-05-14 DOI: 10.4236/jgis.2010.22017
Xiuguo Liu, Yongsheng Li, Wei Gao, Lin Xiao
This paper proposed to use double polarization synthetic aperture radar (SAR) image to classify surface feature, based on DEM. It takes fully use of the polarization information and external information. This pa-per utilizes ENVISAT ASAR APP double-polarization data of Poyang lake area in Jiangxi Province. Com-pared with traditional pixel-based classification, this paper fully uses object features (color, shape, hierarchy) and accessorial DEM information. The classification accuracy improves from the original 73.7% to 91.84%. The result shows that object-oriented classification technology is suitable for double polarization SAR’s high precision classification.
提出了基于DEM的双偏振合成孔径雷达(SAR)图像地物分类方法。它充分利用了极化信息和外部信息。本文利用江西省鄱阳湖地区ENVISAT ASAR APP双极化数据。与传统的基于像素的分类方法相比,本文充分利用了目标特征(颜色、形状、层次)和辅助的DEM信息。分类准确率由原来的73.7%提高到91.84%。结果表明,面向对象分类技术适用于双极化SAR的高精度分类。
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引用次数: 5
Research on Data Sharing between AutoCAD and MapGIS in Cadastral Database Construction AutoCAD与MapGIS在地籍数据库建设中的数据共享研究
Pub Date : 2010-05-14 DOI: 10.4236/jgis.2010.22019
Jiajia Liu, Yang Cai
In the Second Chinese Country Survey, MAPGIS (Map Geographic Information System) is widely used all over the country in the Cadastral Database Construction. There are plenty original data is saved in the AutoCAD (Auto Computer Aided Design) data format. Therefore it is important to find a way which can exchange and share the data between AutoCAD and MAPGIS effectively and efficiently. In order to use MapGIS cadastral management system building cadastral database, it researched the current transformation methods between data of MapGIS and AutoCAD, including analysis defects of ObjectARX technology, southern CASS conversion interface, DXF file conversion. Combining the characteristics of MAPSUV data and southern CASS data, it found a data conversion method through the DWGdirectX control. This method actually read and wrote files provided by the library of MAPSUV and AutoCAD. This way avoids exchange process which can better transform the southern CASS DWG file containing graphics and attributes information to the SUV. The example which showed how DWG file transformed into SUV file. It improves the effectiveness and efficiency of conversion.
在第二次全国调查中,MAPGIS(地图地理信息系统)在地籍数据库建设中得到了广泛的应用。有大量的原始数据保存在AutoCAD(自动计算机辅助设计)数据格式。因此,寻找一种能够在AutoCAD和MAPGIS之间有效地交换和共享数据的方法是非常重要的。为了利用MapGIS地籍管理系统建立地籍数据库,研究了目前MapGIS与AutoCAD数据之间的转换方法,包括分析ObjectARX技术的缺陷、南方CASS转换接口、DXF文件转换等。结合MAPSUV数据与南方CASS数据的特点,通过DWGdirectX控件找到了一种数据转换方法。该方法实际上是读写MAPSUV库和AutoCAD提供的文件。这种方式避免了交换过程,可以更好地将包含图形和属性信息的南方CASS DWG文件转换为SUV。该示例演示了如何将DWG文件转换为SUV文件。它提高了转换的有效性和效率。
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引用次数: 0
期刊
Journal of geographic information system
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