共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
3.
4.
5.
雷建 《测绘与空间地理信息》2016,(5)
根据数字锦州基础地理信息数据库的实现过程、数据库设计需求,对其功能与流程进行简要描述。就我们现在所建立的数据库来说,它是以地理信息系统这种形式支持数字城市基本建设,而已实现的数字城市的基础信息数据库的作用也显得更为重要。本文着重描述和总结了锦州市基础地理信息数据库的建库内容、组织、设计及建库的原则等,同时重点介绍了数据库各部分的系统功能。 相似文献
6.
面向NSDI遥感影象数据库共享的元数据库和数据交换中心技术探讨 总被引:2,自引:0,他引:2
数据发现是数据共享的前提,本文根据NSDI空间数据共享的要求,针对多源遥感影像数据网络发现所面对的技术问题,结合国际国内最新的影像、栅格等地理数据交换标准,为了将原有的遥感影像数据库加入NSDI影像库,进行了具有普遍适用性的遥感影像元数据库内容设计、分级结构模型设计,并基于目前数据交换技术的发展状况,论述了将传统的、孤立的、多源的海量遥感影像数据库加入NSDI遥感影像库,实现快速数据检索的便捷途径和系统体系框架。 相似文献
7.
地理国情普查成果建库是地理国情监测的重要工作内容,可以有效地推动地理国情统计分析工作及地理国情监测各项业务的开展。本文在分析地理国情普查数据建库需求的基础上,设计了地理国情普查数据库的结构,以厦门为例,开发了地理国情普查数据库管理系统,实现了试点普查成果的建库和集中管理,为福建省后续地理国情普查成果的建库奠定了良好的基础。 相似文献
8.
9.
强大的图形功能以及能满足出版要求的地图符号设计功能是地图制图的一个先决条件。利用ArcGIS软件的通用组件库——ArcEngine9.2,对地形图的符号化技术进行了较为系统的研究和探讨,实现了基于基础地理信息数据库的地图符号化表达。同时采用面向对象的设计思想设计了CMyUniqueValueRenderer类,并完成了地图符号库的设计,解决了地图生产中的实际问题。 相似文献
10.
极地地理数据具有多尺度、多类型、多时相、海量存储等特点,为满足对极地数据的高效存储管理,采用基于ArcSDE结合Oracle10g的空间数据库建库技术建设极地空间数据库。本文阐述了极地空间数据库的数据模型、数据库结构、主要技术路线和时空数据一体化概念,提出利用分层和要素编码的方案来管理地理数据。 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.
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
14.
15.
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
16.
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
17.
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
18.
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
19.
“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
20.
《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