共查询到20条相似文献，搜索用时 54 毫秒
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结合工程四参数转换项目编写了相应的图件转换程序,分析DXF文件中实体数据结构,开发了四参数坐标转换、七参数坐标常用坐标转换功能转换等,实现了地形图坐标转换的功能,结合具体的工程实例验证了软件的正确性。 相似文献
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《测绘科学技术学报》2018,(5)
现代智能型全站仪可以在不整平的情况下进行高精度的三维坐标测量,但应用到工程坐标系需要把不整平测量的三维坐标通过公共点进行坐标转换。对基于罗德里格矩阵直接解算的坐标转换数学模型进行了研究,编制了计算软件;并与布尔沙模型及罗德里格矩阵迭代算法的计算结果进行对比分析。该算法通过纯线性的方法解决了非线性约束问题,模型稳定可靠、转换精度高,适用于任意旋转角的三维空间坐标转换。通过该算法求得工程坐标系下全站仪不整平测量时的站心坐标,应用于高速铁路的轨道测量过程中,将会大幅度提高测量效率。 相似文献
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基于Android的测量坐标转换系统的设计与开发 总被引：1，自引：0，他引：1
传统的测量坐标转换软件不适用日益盛行的Android操作系统,运用JAVA,SQLITE数据库,以Android2.2以上版本为开发平台,设计开发的测量坐标转换系统,实现了坐标正反算和换带计算,满足了生产需求。 相似文献
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GPS-RTK技术已经广泛应用于测绘工程的各个领域,特别是在城市测量和工程测量的应用中,因其使用的地方独立坐标系统的特殊性,GPS-RTK坐标转换参数求取方法也具有特殊性。本文从实际工作应用的角度出发,论述了GPS-RTK技术在城市测量和工程测量中坐标转换的不同方法及其适用性。 相似文献
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确定地面点的坐标和高程以及把已知坐标、高程的点放样到地面上是城市道路工程测量的主要工作之一。就道路测设而言，其测量数据量往往很大。由于目前道路工程中使用的主要绘图软件是AutoGAD，因此，只有使全站仪数据与AutoGAD联接，实现内、外业数据转换，才能使全站仪的运用更加有效，进而提高测设效率。 相似文献
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车载式近景目标3维测量系统,采用激光扫描仪获取建筑物立面点云.激光点云仅具有扫描仪坐标系下的坐标,不便于其他数据融合进行3维建模.文中根据系统的特点和要求,通过建立相应的坐标系,利用已有或优化的坐标转换模型确定坐标系之间的坐标转换关系.依据基准点与载体平台GPS接收机之间同步观测数据将激光点云在扫描仪坐标系下的坐标经过多次坐标转换,得到基准点所在当地坐标系下的坐标.使系统实现了满足精度要求的建筑物立面激光点云的定位工作. 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