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简要介绍了手持电脑和Windows CE操作系统的特点。以CMC SuperStar GPS OEM板为例,讨论了在二进制和NMEA-0183两种格式下对GPS OEM板设置时的指令格式,详细介绍了利用Windows API函数对手持电脑的串口进行操作的方法,实现了在Windows CE环境下对GPS OEM板进行设置和导航定位数据及时间信息的提取与处理等功能。 相似文献
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在对微软新一代智能嵌入式平台Windows Mobile 6.5研究的基础上,针对目前广泛采用的PDA与智能全站仪联合作业技术特点,以Visual studio 2008为开发平台,采用多线程技术,实现了PDA与智能全站仪的双向通讯。 相似文献
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本文主要探讨了在 Visual Basic 6.0 (以下简称 VB)环境下实现计算机与全站仪数据通讯的两种方法 :使用 Ms Comm控件和 windows API函数。并结合实例给出了实现两者串行通讯的应用程序及步骤 ,最后对两种方法进行了比较和总结 相似文献
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简要介绍了手持电脑和Windows CE操作系统的特点.以CMC SuperStar GPS OEM板为例,讨论了在二进制和NMEA-0183两种格式下对GPS OEM板设置时的指令格式,详细介绍了利用Windows API函数对手持电脑的串口进行操作的方法,实现了在Windows CE环境下对GPS OEM板进行设置和导航定位数据及时间信息的提取与处理等功能. 相似文献
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全站仪与Pocket PC的通讯技术 总被引：3，自引：1，他引：2
分析开发全站仪与Pocket PC通讯的必要性和可能性,以天玑5100Pocket PC和GTS-311全站仪通讯为例,对全站仪和Pocket PC通讯的关键技术进行介绍. 相似文献
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在VisualBasic6.0编程环境中,实现全站仪与计算机实时通讯,解决了在田径赛中用全站仪对投掷项目进行自动化测量及数据管理问题。实践证明,该方法是可行的。 相似文献
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张丽梅 《测绘与空间地理信息》2007,30(1):116-119
本文简述了电子平板系统的发展历史,讨论了电子平板系统的串行通讯原理,给出了目前作业单位经常使用的全站仪的串行通讯参数,重点对可编程输出的全站仪与PDA的通讯进行了叙述,最后,对电子平板系统的发展进行了展望。 相似文献
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本文简要介绍了ＰＣ—Ｅ５００与全站仪的数据通讯技术，并结合实践经验给出了几种全站仪的通讯参数及Ｅ５００与全站仪数据通讯程序流程图。 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