共查询到20条相似文献，搜索用时 62 毫秒
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分形理论在城市交通网络时空演变特征研究中的应用--以上海市为例 总被引：6，自引：0，他引：6
以上海城市交通网络为例，通过不同行政区域交通网络的分维值测算，研究了分形特征的空间变化；利用上海全域及典型行政区交通网络不同时代的分维，研究了分形特征的时间演化。结果表明，上海城市交通网络的分形特征在空间域上城区内域明显复杂于外域，在城市发展主轴方向上表现为由内向外分维测度值的降低；而在时间域，近期的交通网络分形复杂度明显高于早期，反映了城市发展与形态演化的时间过程。 相似文献
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针对城市地价定量化研究和空间可视化表达的方法体系已日渐成熟的现状,该文以2008至2014年间,石家庄市主城区土地交易数据作为研究样本,借助ArcGIS、GS+软件平台,分别建立石家庄市城区商业和住宅数字地价模型,并依据模型进行地价数量特征、剖面特征、等值线形态特征分析等一系列空间分析。研究表明:石家庄市城区商业地价分布,整体上呈现出围绕一个传统的一级商业中心和一个新兴的次级商业中心向边缘衰减的圈层结构;住宅地价分布呈现出多峰值、多方向山脊状圈层衰减的结构,且聚集效应不及商业地价明显,衰减趋势较平缓。 相似文献
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运用聚集维数、网格维数、关联维数等地理数学方法,结合ArcGIS10.2软件研究空间结构特征及优化.研究发现:①辽宁省特色小镇空间聚集作用较强,西柳镇中心性明显,对其他特色小具有一定的吸附作用并在附近存在多分形特征;②在发展过程中特色小镇具有集中于线状区域的趋势.系统空间演化是以局部区域部分城市为节点,通过内部道路系统要素进行能量传递而形成的分形特征;③牛鸭维数β=0.9819趋近于1,表明辽宁省特色小镇之间的交通通达性较好;④加强特色小镇之间的合作、提高交通网络通达度、构建旅游空间格局对优化空间结构有重要影响.基于分形理论探寻空间结构特征及优化,为辽宁省构建特色小镇产业群提供参考. 相似文献
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分形理论在交通网络分布形态研究中的应用 总被引：2，自引：0，他引：2
探讨了以分形几何理论为基础的表达空间网络分布特征的几种分维数,重点描述了相似分维数的定义及其地理意义,以实例说明了相似分维数在交通网络分布特征研究中的应用,对测算结果进行了分析和评述。 相似文献
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城市交通网络在微观尺度具有局部积聚、马太效应等特征;在宏观尺度具有小世界、无标度等特征;除上述两种极端情况,还具有介于宏观和微观之间的层次结构.社区结构就是城市交通网络关键结构特性之一.构建了精细颗粒度空间网格的时空立方体模型,将社区结构发现算法应用于成都市出租车轨迹的研究中,以成都市2016年11月1日-7日的出租车轨迹数据为例,对其进行时空分析,探讨了公交站点核密度估计结果与出租车出行数据之间的相关性;并利用空间热点发现算法发掘了城市不同时刻的热点网格,构建了城市复杂交通网络,进行了节点之间空间相关性分析以及社区结构发现研究.结果表明,城市交通网络符合复杂网络特性,且呈现明显的社区结构,市区人流具有强烈的潮汐效应. 相似文献
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采用Landsat TM数据分析了阿克苏河—塔里木河断面水质污染状况,通过波段的DN值和常规监测数据建立能反映水质状况的
污染物监测模型。结果发现,将2000年常规监测数据代入模型后,与遥感数据的结果基本吻合| 重建阿克苏河—塔里木河的连续水体
污染变化曲线,得出污染物浓度随着远离上游而增加。 相似文献
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Monitoring drought dynamics in the Aravalli region (India) using different indices based on ground and remote sensing data 总被引：5，自引：0，他引：5
C. Bhuiyan R.P. Singh F.N. Kogan 《International Journal of Applied Earth Observation and Geoinformation》2006,8(4):289-302
The hard-rock hilly Aravalli terrain of Rajasthan province of India suffers with frequent drought due to poor and delayed monsoon, abnormally high summer-temperature and insufficient water resources. In the present study, detailed analysis of meteorological and hydrological data of the Aravalli region has been carried out for the years 1984–2003. Standardised Precipitation Index (SPI) has been used to quantify the precipitation deficit. Standardised Water-Level Index (SWI) has been developed to assess ground-water recharge-deficit. Vegetative drought indices like Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) and Vegetation Health Index (VHI) have been computed using NDVI values obtained from Global Vegetation Index (GVI) and thermal channel data of NOAA AVHRR satellite. Detailed analyses of spatial and temporal drought dynamics during monsoon and non-monsoon seasons have been carried out through drought index maps generated in Geographic Information Systems (GIS) environment. Analysis and interpretation of these maps reveal that negative SPI anomalies not always correspond to drought. In the Aravalli region, aquifer-stress shifts its position time to time, and in certain pockets it is more frequent. In comparison to hydrological stress, vegetative stress in the Aravalli region is found to be slower to begin but quicker to withdraw. 相似文献
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Piyoosh Rautela Ramesh Chandra Lakhera 《International Journal of Applied Earth Observation and Geoinformation》2000,2(3-4)
The area around Sataun in the Sirmur district of Himachal Pradesh, India (falling between the rivers Giri and Tons; both tributaries of the Yamuna River) was studied for landslide vulnerability on behalf of the inhabitants. The study was made using extensive remote sensing data (satellite and airborne). It is well supported by field evidence, demographic and infrastructural details and aided by Geographic Information System (GIS) based techniques. Field observations testify that slope, aspect, geology, tectonic planes, drainage, and land use all influence landslides in the region. These parameters were taken into consideration using the statistical approach of landslide hazard zonation. Using the census data of 1991, vulnerability of the populace to the landslide hazard was accessed. As most of the infrastructure in the region is concentrated around population centres, population data alone was used for vulnerability studies. 相似文献
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ZHAN F. Benjamin 《地球空间信息科学学报》2011,(1)
Although it is well known that coseismic gravity changes take place during an earthquake, previous research has not yielded convincing evidence demonstrating that significant gravity changes occur before large earthquakes. Furthermore, even if we suspect that gravity changes occur before large earthquakes, we have yet to demonstrate how to consistently observe these changes for useful earthquake forecast that would bring benefits to society. We analyzed ground gravity survey data obtained in 1998, 2000, 200... 相似文献
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GNSS系统及其技术的发展研究 总被引：3，自引：1，他引：2
阐述了国际上卫星导航系统的总体发展,对美、俄、欧、中的四大全球系统,以及相关的区域系统和增强系统进行了简单的介绍,研究分析了GNSS系统及其技术的发展趋势,同时分析了我国Compass全球系统面临的机遇和挑战,并提出了我国未来工作的建议. 相似文献
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“4D”技术及其应用 总被引：13，自引：0，他引：13
介绍“４Ｄ”（即数字地面模型、数字正射影像、数字栅格地图和数字线划地图）系列产品的生产流程、关键技术、及其在耕地保护、防灾减灾救灾和城市规划等方面的应用方法。 相似文献
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《International Journal of Digital Earth》2013,6(1):66-87
Abstract Virtual Australia is not a well-defined or agreed concept. This discussion paper conceptualises Virtual Australia as a ‘virtual [digital] model containing and representing all non-trivial objects and their contextual environment – from blue sky to bedrock – in real world Australia’. It describes a scenario for Virtual Australia, one or two decades from now, in which the locations and conditions of non-trivial objects and their environment are updated automatically through a combination of remote sensing and wireless communication technologies in support of a ‘Supranet’. It then examines the concept of the ‘Supranet’ – a pervasive information network based largely on wireless technology linking the physical world to a virtual model in real time – and develops and discusses three principal characteristics of the Supranet: the ability to have or collect specific information (know); the ability to process information (think); and the ability to communicate that information. If, in the near future, any or all non-trivial devices are to some extent able to know, think and communicate, the potential for object autonomy will be realised. 相似文献
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Toward seamless indoor-outdoor applications: Developing stakeholder-oriented location-based services
Kohei OGAWA Edward VERBREE Sisi ZLATANOVA Naohiko KOHTAKE Yoshiaki OHKAMI 《地球空间信息科学学报》2011,14(2):109-118
Location-Based Services (LBS),an emerging new business based on smartphone and mobile networks,are becoming more and more popular.Most of these LBSs,however,only offer non-seamless indoor/outdoor applications and simple applications without giving stakeholders the chance to play an active role.Our specific aim is to solve these issues.This paper presents concepts to solve these issues by expanding the Open Location Services Interface Standard (OpenLS) to allow seamless indoor/outdoor positioning and to extend the content of the services to include information recommended by stakeholders. 相似文献
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地理数据库的关系模型及其实现 总被引：1，自引：0，他引：1
本文从以图论观点分析地理实体入手,系统阐述了地理数据库关系模型的设计法和过程。作者于1984年4～9月间在微型机上设计建立了关系型地理数据库的实方验系统(RGDB)。该系统采用了本文提出的关系模型,采用了可动态扩库的子库组合结构,这种结构具有灵活性和提高空间利用率的优点。RGDB含有多种功能的数据操作命令,除了具有一般检索功能外,还能进行“开窗”选取和十分“自由”的映象选取。本文对RGDB系统的主要性能和实现途径作了扼要介绍。 相似文献