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随着城市建设步伐的加快和基础地理信息应用领域的扩展,国家经济建设和人民群众生活对基础地理信息的需求越来越大,对基础地理信息的现势性和更新频率也提出了更高的要求。因此,对不同精度、不同来源的地理信息数据融合技术进行研究具有十分重要的意义。道路实体是重要的基础地理信息,尤其是铁路、高速、国省道、城市主干道。本文重点围绕道路实体研究数据间的差异性,建立了自动匹配评价指标;并基于FME平台搭建同名匹配、变化检测和增量更新模型,实现了道路实体自动更新和融合,缩短了道路实体更新周期。“十三五”第2轮基础测绘更新项目利用该技术完成了重要道路实体的融合,证明了该技术的可行性和准确性,为新型基础测绘体系的建设提供了技术支撑。 相似文献
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正基础测绘作为测绘地理信息事业的立业基础,在新修订的《测绘法》中进行了明确定义:"建立全国统一的测绘基准和测绘系统,进行基础航空摄影,获取基础地理信息的遥感资料,测制和更新国家基本比例尺地图、影像图和数字化产品,建立、更新基础地理信息系统。"基础测绘经过几十年的长足发展,取得了丰硕的成果,为国家经济和国防建设提供了可靠有力的测绘地理信息服务保障。为了深入贯彻落实 相似文献
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随着城市现代化进程的加快和社会信息化的快速发展,社会对于基础地理信息数据的现势性要求日益提高.而传统的基础地理信息数据库的更新方式已很难满足当前的需求.本文以福州市地理信息数据寻求新的管理与更新模式为背景,研究福州市地理信息数据联动更新方法.通过对福州市的测绘业务和数据库的梳理和研究,建立基于联动关系的业务数据联动更新数据库和数据库间联动更新两种工艺流程,为提高福州市地理信息数据库的更新效率以及数据库的现势性提供了保障. 相似文献
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赵朋 《测绘与空间地理信息》2022,(2)
21世纪测绘部门逐步进入信息化测绘阶段,本文分析了测绘产品更新滞后、更新不及时的现状,提出了基于EPS生产办公信息化系统实现基础地理数据生产、动态更新入库流程化,强化生产流程信息化,扩展报表统计功能,并增加测绘生产办公流程管理、测绘生产进度信息采集、测绘生产质检流程管理信息统计的功能。探索城市勘测类测绘单位从生产型测绘向综合服务型测绘转型升级,开展信息化测绘体系建设,在数据获取、数据处理、数据服务及社会应用等方面进行研究,解决测绘地理信息数据生产与需求的矛盾,突破测绘地理信息资源整合与共享利用的瓶颈,从整体上提高测绘地理信息综合服务能力。 相似文献
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《现代测绘》2021,(1)
基础测绘是测绘地理信息立业之基。物联网、互联网、大数据、云计算和人工智能等技术的不断进步以及"智慧城市""生态文明"等国家战略的推进促使基础测绘改革升级,新型基础测绘应运而生。阐述了新型基础测绘产生的背景以及基础测绘与新型基础测绘的基本概念,并从测绘体系建设、实景三维建设、按需测绘、多测合一、基础测绘与基础地理信息、基础地理信息与专题地理信息、联动更新等视角剖析新型基础测绘应具有的内涵。新型基础测绘应在统一时空框架下,构建高精度的地表和地形三维模型,并在这些高精度三维模型上,按需生成不同应用需求的场景模型,按需生产不同要素、不同尺度、颗粒度的地理信息产品。 相似文献
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基于最新基地测绘地理信息数据集,本文从基地测绘成果管理、分发服务、档案管理和应用服务等角度出发,系统地开展和完善极地测绘地理信息分类方法研究、基地测绘地理信息数据库及管理系统架构的设计与研建,以实现对各种数据和信息的快速查询、检索、统计,及时修改更新、空间分析与资源共享等,避免数据资料流失,实现数据的可持续利用,为科研人员和决策人员提供全面的研究和决策基础。 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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自动车辆定位导航系统中传感器的误差分析 总被引:1,自引:0,他引:1
对国界定位导航系统中几种常见的辅助传感器所产生的误差进行了分析,导出了不同传感器的误差模型。这些误差模型是估计车辆位置的扩展卡尔曼滤波器的基础,同时也为选择适当的传感器提供了理论根据。 相似文献