共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
矢量地理信息快速制作出版地图问题,始终是数字成图生产的瓶颈.文中提出一种面向矢量一体化处理的全局模型,该模型采用具有亚拓扑特征的超Spaghetti数据结构进行矢量空间数据组织,并在此基础上面向一体化任务所执行的行业标准,进行属性资源模型重构,建立由具有隐含拓扑关系的空间数据和属性参数组成的拓扑信息模型,为实现具有智能化特征的一体化矢量数据处理过程奠定了完备的底层数据基础.基于该矢量一体化全局模型的矢量数字成图方法,可快速获取具有出版效能的矢量地理信息. 相似文献
3.
基于数据挖掘和知识发现的矢量一体化全局模型 总被引:2,自引:0,他引:2
矢量地理信息快速制作出版地图问题,始终是数字成图生产的瓶颈。文中提出一种面向矢量一体化处理的全局模型,该模型采用具有亚拓扑特征的超Spaghetti数据结构进行矢量空间数据组织,并在此基础上面向一体化任务所执行的行业标准,进行属性资源模型重构,建立由具有隐含拓扑关系的空间数据和属性参数组成的拓扑信息模型,为实现具有智能化特征的一体化矢量数据处理过程奠定了完备的底层数据基础。基于该矢量一体化全局模型的矢量数字成图方法,可快速获取具有出版效能的矢量地理信息。 相似文献
4.
5.
从作业生产实际需求出发,深入研究了数字正射影像的制作过程和各环节关键技术,通过对大量数字正射影像图像素位置统计对比,并参照相关规范,开发了数字正射影像图制作中图廓整饰自动化工具软件,很好地弥补了传统图廓整饰方法的不足,显著地提高了作业生产效率。该软件已经应用在某测区1∶2 000正射影像图制作任务中。 相似文献
6.
结合1∶5000全要素数字线划图(DLG)数据生产实践,阐述了测制DLG成果的作业方法及要点,分析了提高成果质量应注意的问题,强调了检查验收的方法和步骤,为今后1∶5000全要素数字线划图的生产提供参考和可借鉴的经验. 相似文献
7.
对照<1:50 000地形要素数据规定>,探讨了采用1:10 000数字线划图做基本资料缩编更新1:50 000地形要素时的异同点和作业过程中的处理方法,并对缩编更新的制图综合技术、规范、生产及质量控制做了一些阐述. 相似文献
8.
一、引 言
全站仪数字化测图技术是现代测绘技术、计算机技术和信息技术相结合的产物,也是地图制图学研究的重要方向之一.自20世纪90年代以来,随着全站仪和计算机技术的发展和普及,数字化测图技术的研究得到了飞速的发展.简单地说,数字测图就是用数字形式存储全部地图信息的地图,它是用数字形式描述地图要素的属性、定位和关系信息的数据集合,是存储在具有直接存取性能的介质上的关联数据文件.数字化测图技术在测绘生产与实践中已得到了广泛的应用.为了分析和评估全站仪数字测图的精度问题,本文以全站仪数字测图技术的方法入手,从全站仪数字测图技术的过程中,分析和评估全站仪数字测图的精度,并对全站仪在数字测图使用过程中的误差产生及大小作分析,从而正确评定全站仪数字化测图的精度. 相似文献
9.
10.
《测绘与空间地理信息》2020,(5)
针对当前数字测图实习教学实践中过程质量控制与成果质量评价存在的问题,本文从教学目标出发,对实习基本教学环节进行分解,形成了具体的质量控制要素体系。根据质量控制要素,结合数字测图实习的过程特点和成果类型,制订出完善的实习过程与成果评价指标体系以及相应的实施方案,对提高数字测图实习教学质量起到积极的作用。 相似文献
11.
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
12.
13.
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
14.
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
15.
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
16.
17.
“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
18.
《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
19.
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