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为了适应现代工程需求,将某项目的水准网数据平差计算进行数据库设计,实现数据调用及读写、内业编程平差计算、精度评定、数据处理软件化自动化运行,提高数据处理和精度评定的效率,并实现高质量有效地管理水准测量数据,满足测绘专业工作人员的需要.通过数据库设计,合理地组织水准网数据库,经过高程控制网的数据估算和精度评定,达到高效解算的目的,可应用于实际工程中. 相似文献
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在煤矿井下水准测量中,水准网常布设为沿巷道的长条型或方格网型,这些水准网中经常含有多个闭合环。然而,由于测量过程中各种误差影响,其闭合环存在一定高差闭合差。通常采用条件平差或间接平差法以消除高差闭合差。但是因其计算的复杂性,所以在实际井下作业时经常带来不可避免的麻烦,尤其是复杂的井下测量水准网。为了进一步提高和优化井下水准测量成果的精度,方便、有效、快捷地完成井下测量作业,采用了逐环分配闭合差的方法对其进行数据处理。通过理论分析及实例计算验证分析,结果表明,相比较条件平差法,逐环分配闭合差法是一种更简便、实用和行之有效的水准网数据处理方法。 相似文献
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GPS网平差中,平面边长的精度评定是一个很重要的环节,特别是平面边长的相对精度更是决定网平差成果质量的重要指标之一。本文探讨了边长两端点坐标间相关性对评定平面边长精度的影响,并利用某一城市GPS控制网的数据对精度评定结果进行了分析,结果显示:顾及边长两端点坐标间相关性的精度评定方法较为合理。 相似文献
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以现代测绘基准建设的短基线GNSS网作为应用实例,研究比较采用对流层延迟估计与对流层延迟不估计两种短基线解算策略在GLOBK软件中的平差精度,并结合已有二等水准正常高,生成两套GNSS/水准点的成果,通过似大地水准面计算软件,利用地球重力场模型对两种策略下的平差结果进行模型拟合验证,以此评价其平差精度与拟合精度的影响.... 相似文献
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水准测量的外业数据要经过内业数据处理提高数据精度,好的水准平差函数模型将会更好地提高数据精度,提出结点水准网中结点的最或然值的快速平差计算方法。 相似文献
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《武汉大学学报(信息科学版)》2020,(4)
大地测量技术是地面沉降灾害监测的重要手段,其中水准测量是地壳垂直运动速度的经典观测手段。针对多期水准网测量数据中的异常误差,提出一种多期水准网自适应动态平差方法。改进等价权函数,进一步抑制观测数据中的异常误差影响;采用最小二乘配置方法,建立区域垂直运动速度模型。以山东境内及周边二等水准网数据为例进行验证,验证结果表明,该方法有效削弱了水准观测数据中异常误差影响,提高了二等水准网动态平差精度;并通过获取的山东省最近十年高精度垂直运动速度,得出了山东区域北部、西部整体上呈下降运动趋势,东部、东南整体上呈缓慢上升趋势的结论。 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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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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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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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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李志宽 《测绘与空间地理信息》2009,32(2)
3维技术以其直观、眩目的表现力深受人们喜爱.利用3S技术和Skyline开发平台,可以构建大型企业3维地理信息系统,以满足企业设计部门和资产管理部门对基础地理信息的需求.兼容原有2维系统的总图3维信息系统,将为企业的日常管理、设计施工、分析统计、规划决策等提供更加可靠、直观、多层次、多功能的综合服务信息. 相似文献