共查询到20条相似文献，搜索用时 46 毫秒
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通过应用WILD GAK-1陀螺经纬仪进行逆转点法、中天法及时差法的定向实验,论述了3种定向方法的理论精度,并和实际定向精度进行了比较。 相似文献
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陀螺经纬仪三点测时快速定向法 总被引：2，自引：0，他引：2
本文论述只在陀螺分划板的三条分划线上测取穿过时间而不测摆幅的快速定向方法。对于GAK1陀螺经纬仪，采用这种方法观测一次仅需6～7分钟（马达启动到停止）。本文比较了这种方法与中天法、记时摆幅法Ⅰ、多点测时法、5点快测法的观测精度。 相似文献
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陀螺经纬仪定向系统误差研究 总被引：2，自引：1，他引：1
通过对不同观测者用逆转点法进行的陀螺经纬仪定向实验数据分析,确认不同观测者在用逆转点法进行陀螺经纬仪定向时存在着显著的系统误差,而且这种系统误差的大小还随所使用的仪器不同而不同。研究结果对制定陀螺经纬仪定向操作程序和提高定向精度有一定的指导意义。 相似文献
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介绍了陀螺全站仪在地铁竖井联系测量中的应用。简述井上下连接测量、陀螺全站仪定向的方法,分析陀螺定向的精度,讨论定向方法的优缺点。实践表明:利用陀螺全站仪进行竖井联系测量,克服了几何定向精度低、占用井筒时间长等缺点,提高了井下测量数据精度,为地铁安全生产工作提供了保证。 相似文献
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为了减少起始方位角对最终边的影响,保证矿井高精度的长距离贯通,文章对提高TJ9000陀螺全站仪定向精度方法进行了研究。以内蒙古鄂托克前旗某煤矿精密贯通测量工程为例分析了已知边位置对仪器常数的影响,选择了工程中需要加测的陀螺定向边,制定了合理的观测方案和数据处理方法。利用陀螺全站仪进行井上、井下陀螺定向观测,进行严密平差计算和数据处理,及时对贯通导线进行修正,最后对结果进行比对分析。结果表明,采用距离定向边更近的已知边来测定仪器常数所得到的陀螺边定向精度更高;应用陀螺全站仪加测定向边可以提高贯通精度并且操作简单方便、实用性好。 相似文献
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陀螺经纬仪定向精度分析 总被引：3，自引：0，他引：3
陀螺经纬仪的定向精度是评价其质量的重要指标之一.以GAK-1型陀螺仪为例,从其定向过程中主要的误差来源入手,理论上对陀螺经纬仪定向过程及影响测量精度予以研究与探讨,并结合赵家寨煤矿现场生产实践,实例分析了陀螺经纬仪的定向精度,提出了提高其定向精度与工作效率的意见与建议. 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