共查询到20条相似文献，搜索用时 78 毫秒
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王胜强 《测绘与空间地理信息》2012,(6):190-192,195
探讨了无反射棱镜全站仪的原理及其特点,对索佳SET2130 R3全站仪在无反射棱镜条件下的测距性能进行了分析,主要包括不同材质对测距精度的影响分析;不同材质颜色对测距精度的影响分析;不同距离对测距精度的影响分析;边缘点测距精度试验;反射面透明度对测距精度的影响分析,以及不同网孔的穿透试验。根据以上实验得出该仪器测距精度稳定的结论,同时提出了无反射棱镜全站仪在测距工作中的注意事项。 相似文献
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无反射棱镜全站仪是无反射棱镜测距技术与传统全站仪的结合,它具有普通全站仪所不具备的优点。以徕卡TCR402为例,在无反射棱镜条件下对测量精度进行多方面的测试,得出无棱镜测距精度与距离、反射物体的属性及气象条件等有关,并在特殊条件下（如透明物体等）测量距离存在偏差的结论。 相似文献
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日本拓普康公司生产的MS05系列全站仪,主要针对高精度测量要求的用户,具有测量精度高、功能全、可靠性好等特点,在测绘、建筑、三维工业测量等领域有着广泛的应用。其测角标称精度为0.5″,测距标称精度对反射片为0.5 mm+1 ppm,对棱镜为0.8 mm+1 ppm,对无棱镜测距为1 mm+1 ppm,这一精度指标与一般全站仪有较大差别,尤其是该仪器对反射片及无棱镜的测距精度远高于其它同等级仪器。针对这一特点,给出了MS05全站仪的基本特点,并以大量的测试试验对其标称精度进行了测试。 相似文献
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无反射棱镜全站仪是不用棱镜作为照射目标就可以进行测距的全站仪,是无反射棱镜测量距离技术与一般全站仪的融合,具有一般全站仪不能替代的优点。利用无反射棱镜可以方便、快捷地测量距离,实现了"即测即得"。已普遍应用于数字地形图测绘的此类全站仪,其所测定地物点的精度满足规范的要求,因此,对无反射棱镜测量这项新技术的工作原理、成果精度进行了系统的阐述与总结。 相似文献
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本文以无棱镜全站仪结合RTK测量技术在三门海游大闸地形测量中的应用为例,着重介绍无棱镜全站仪与RTK相结合的测量技术在测绘领域的发展现状及其前景。通过对无棱镜测距的介绍,精度的分析,提出无棱镜测距全站仪的优势,但是面对一个整体测绘工程项目,单一的全站仪使用是不够的,应该同时结合RTK在工程中的应用。本文所使用的技术对类似工程具有一定的参考价值。 相似文献
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Hyuk Park Yong-Hoon Kim 《Geoscience and Remote Sensing Letters, IEEE》2009,6(2):229-233
A 2-D Doppler-radiometer has been proposed to improve the poor angular resolution of microwave radiometers, using aperture synthesis on a moving platform. In this letter, we investigate drawbacks of the Doppler-radiometer, which have not been discussed previously in detail. The imaging method is revised to be suitable for imaging of distributed sources, which is the more common situation than a point source, and then the specklelike sidelobes in the point source response are discussed. In distributed source imaging, the specklelike sidelobes in the point source response of the Doppler-radiometer severely degrade the imaging performance, so it is necessary to reduce them. The cause of specklelike sidelobes is discussed, and a sparse array is proposed to improve the imaging performance of the Doppler-radiometer. The improvement is demonstrated by simulation of the point source response, showing reduced speckle. 相似文献
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Michael A. Graber 《Journal of Geodesy》1974,48(4):419-423
It is possible to simply describe the curve followed by a chain suspended in a non-uniform gravitational field. Parallel discussions
are given using the two theories of gravitation, Newtonian and general relativistic. 相似文献
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Representing the topological relations between directed spatial objects has gained increasing attention in recent years. Although topological relations between directed lines and other types of spatial objects, such as regions and bodies, have been widely investigated, few studies have focused on the topological relations between directed lines and directed regions. This research focuses on the representation and application of directed line–directed region (DLDR) topological relations, and may contribute to spatial querying and spatial analyses related to directed spatial objects or time‐varying objects. Compared with other topological relation models, a DLDR model that considers the starting and ending points of the directed line and the front and back faces of directed regions is proposed in this research to describe the topological relations between directed lines and directed regions. DLDR topological relations are presented, the completeness of the 111 DLDR topological relations is proved, and the topological relations based on the 9‐intersection model (9IM), 9+‐intersection model (9+‐IM), and DLDR model are compared. The formalism of the DLDR model and the corresponding geometric interpretations of the 111 DLDR topological relations are presented, seven propositions are stated to prove the completeness of the 111 DLDR topological relations, and the case study shows that more detailed topological relation information can be obtained based on the DLDR model. 相似文献
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Eugenio Trumpy Gianpaolo Coro Adele Manzella Pasquale Pagano Donatella Castelli Philippe Calcagno 《International Journal of Digital Earth》2016,9(5):499-519
Geothermal data are published using different IT services, formats and content representations, and can refer to both regional and global scale information. Geothermal stakeholders search for information with different aims. E-Infrastructures are collaborative platforms that address this diversity of aims and data representations. In this paper, we present a prototype for a European Geothermal Information Platform that uses INSPIRE recommendations and an e-Infrastructure (D4Science) to collect, aggregate and share data sets from different European data contributors, thus enabling stakeholders to retrieve and process a large amount of data. Our system merges segmented and national realities into one common framework. We demonstrate our approach by describing a platform that collects data from Italian, French, Hungarian, Swiss and Icelandic geothermal data providers. 相似文献
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Separate space- or time-lags have been considered regularly in data analyses; as space–time models are more recently being
studied extensively in data analytic fashion, joint estimation of both lags has to be considered explicitly. This paper addresses
this issue, taking into special consideration parametric parsimony together with specification richness; use of the bivariate
Poisson frequency distribution is advocated and applied to an empirical case. The relation of this approach to random effects
specifications is investigated. Data for Belgian regional products constitute the empirical case study.
相似文献
| Daniel A. GriffithEmail: |
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The conventional international origin (CIO), established from observations made a century ago, is not directly related to observations by modern space-geodetic techniques. Both the greater precision of these techniques and improved knowledge of the structure of the Earth justify the need for a new CIO. We analyze recent polar motion time-series (VLBI, SLR, and GPS) to test estimators that might be used to establish such a new conventional origin. This new origin would be defined as the barycenter of the motion of the pole for a specific epoch. Consistency among the series examined is of the order of 2 milli-arc-seconds. A drift model can be employed in the analysis of specific series to establish an origin as the barycenter at a specific epoch, rather than the midpoint of the series. As an example, we estimate a “Conventional International Reference Origin” for the year 2000.0, using polar motion series that began in 1984. 相似文献
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Building an environmental quality index for a big city: a spatial interpolation approach combined with a distance indicator 总被引：1，自引：1，他引：0
One of the main tasks of regional and environmental economics is to construct Environmental Quality Indexes for big cities.
A standard method is to generate a single measure as a linear combination of several contaminants by applying Principal Component
Analysis. Spatial interpolation is then carried out to determine pollution levels across the city. We innovate on this method
and propose an alternative approach. First, we combine a set of noise and air pollutants measured at a number of monitoring
stations with data available for each census tract. This yields a mixed environmental index that is socioeconomically more
complete. We then apply kriging to match the monitoring station records to the census data. Finally, we construct a composite
pollution index using the Pena Distance method (DP2), which proves more robust than traditional approaches. 相似文献