共查询到20条相似文献，搜索用时 62 毫秒
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刘合辉 《测绘与空间地理信息》2017,40(7)
Web地图因在其现势性、覆盖范围、详略层次等方面优越性明显,在专题地图生产中得到了认可,但专题地图生产对其方便、灵活使用提出了新的要求。为解决这个问题,本文着重研究了Web地图瓦片在MapGIS专题地图生产中研究显示方法,通过地图瓦片图幅计算、拼接、投影变换与显示等处理,实现了地图瓦片在MapGIS中与专题地图快速动态叠加显示。 相似文献
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在MapGIS软件平台支持下对专题地图制作进行研究,以辽宁省地质专题地图为底图,对其进行专题地图制作,包括对栅格地图的配准校正,数据库的设计建立、矢量化、符号化等一系列的制图工作,通过一些制图方法来完成地质专题地图的制作与研究。 相似文献
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示意性地图作为一种特殊的专题地图,较之传统专题地图,有着不同的制图法则和制图方法,目前,示意性地图的设计还缺乏充足的理论依据和技术支持,本文从图面、风格、符号等方面对示意性地图的设计进行了研究,提出了一些示意性地图综合的方法,最后将这些方法应用到一个实例之中。 相似文献
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根据地震应急专题地图的不同需求分别制定不同的应急专题地图出图逻辑流程。建立地震应急专题图基础数据库,并利用ArcGIS模型构建器对专题图数据库中的数据需求分类进行快速调取数据和处理数据。使用Arcpy自动出图脚本进行地震应急专题地图的自动批量制图,从而加快不同要求下地震应急专题图的制图速度,提高专题图的出图效率。 相似文献
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专题地图是人们接触自然、了解自己活动空间的基础,也是不同历史时期社会、经济、文化的产物。近年来,随着社会经济、科技的飞速发展,非专业用户专题地图的需求空间呈现出前所未有的高涨态势,如何进行专题地图服务成为地图生产单位和地图研究人员共同面对的一个课题。 相似文献
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《世界港口交通地图集》是中国地图出版社首次利用世界地图数据库编制出版的专题图集,该图集打破了传统的制图方式,完全借助于数据库制图的技术手段,开启了利用小比例尺世界基础地理底图数据库制作专题地图的新篇章。从地图选题、结构设计、地图投影、色彩设计、专题符号、读图方法等方面详细论述利用数据库制图技术编制地图的原则、方法和特点。 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