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以"几何约束互相关"模型为基础,将迭代高程等效成"半全局影像匹配"方法中的左右视差,通过匹配代价的聚合分析,提出了一种多基线立体影像匹配方法 GC~3-P-SGM,并给出了其具体匹配步骤和处理流程。利用天绘一号卫星影像数据进行了实验和分析,结果表明,该方法具有较高的匹配性能和匹配精度。 相似文献
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分析了SGM影像匹配算法的基本思想及其不足,给出了半全局影像匹配算法的基本模型;在此基础上,对该SGM算法模型进行了多分辨率扩展,设计了一种多分辨率半全局影像匹配方法 P-SGM,并讨论了该方法的实现步骤及其技术细节;利用实际影像数据进行了P-SGM影像匹配实验。实验结果表明,该方法能够完成大场景、大幅面遥感影像的密集匹配工作,获取实验区密集匹配点云;并具有较高的匹配性能和匹配精度。 相似文献
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针对数字城市地理空间框架建设中地址匹配的具体需求和现存中文地址匹配方法中存在的问题,该文提出一种多元地址要素组合的地址匹配方法:分析地名地址数据的分词方法和作为参考数据的地址编码库的物理结构;给出组合策略和匹配流程,针对地址要素的不同重要程度分配权重,计算不同组合中各地址要素相似性匹配指数,并采用加权求和方式获得匹配总分;并以城市地址编码数据库为参考数据,工商领域监管对象地名地址数据为输入地址对提出方法进行实验和验证,与其他匹配算法对比的结果表明,提出算法有效、正确、灵活。 相似文献
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针对精度差、频率低的浮动车数据特点,给出了空间和拓扑约束下的最短路径浮动车数据地图匹配算法,基于不同采样频率的匹配结果证明算法准确度高。基于武汉市浮动车数据的匹配结果表明,算法具有高可靠性,可以用于浮动车数据的交通信息提取与特征挖掘。 相似文献
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几何地理数据相似性是地理数据匹配处理的基础,决定着地理数据匹配结果的成功率和准确率。本文分别从点、线、面3个角度对几何地理数据的相似性进行深入分析,通过对点、线、面三种地理要素特点的深入研究,给出了几何地理数据的相似性算法和度量模型。通过实验,初步验证了所提算法的可行性,为地理数据的相似性匹配研究奠定了基础。 相似文献
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在GIS数字化输入空间数据时，经常碰到分幡接边时的数据匹配问题，本文提出了一种建立于综合考虑距离和整体结构的模糊数据匹配算法，并给出了应用实例。 相似文献
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GPS车载导航系统数据误差分析及精确定位 总被引：1，自引：0，他引：1
深入分析了影响GPS车载导航系统数据质量的各种误差，给出在不同阶段提高车载导航系统中数据质量的方法，最后提出用地图匹配算法提高车载导航系统的定位准确度。 相似文献
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浮动车数据(Floating Car Data,FCD)已广泛应用于城市规划、智能交通系统中,其中地图匹配一直以来都是浮动车数据应用的技术难点。本文在已有地图匹配算法的基础上,提出了基于点序列和要素加权法的地图匹配模型,不仅考虑了当前GPS点的信息,同时也考虑了GPS数据的历史信息和道路网的拓扑结构,从空间关系上分析车辆行驶轨迹和道路的相似性。作者通过上海市出租车轨迹数据对算法进行验证,结果表明:该匹配模型解决了已有地图匹配算法的一些弊端,并且提高了地图匹配的精度,具有高效、实用的特点。 相似文献
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EGM96,WDM94和GPM98CR高阶地球重力场模型表示深圳局部重力场的比较与评价 总被引：9，自引：0，他引：9
为计算深圳精密重力大地水准面，利用62个高精度GPS水准点和4871个实测重力点数据对EGM96，WDM94和GPM98CR全球重力场模型表示深圳局部重力场进行了比较与评价。结果表明，由上述3个重力场模型计算的大地水准面高和重力异常与实测值之间存在明显的系统偏差，当采用GPS水准数据尽可能消除系统偏差以后，大地水准面高的精度得到显著提高，若应用移去-恢复技术确定深圳高精度大地水准面，则WDM94应该是首选的参考重力场模型。 相似文献
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Ionospheric delays can be efficiently eliminated from single-frequency data using a combination of carrier phases and code
ranges. Unfortunately, GPS and GLONASS ranges are relatively noisy which can limit the use of the positioning method. Nevertheless,
position standard deviations are in the range of 6–8 cm (horizontal) and 7–9 cm (3d) obtained from diurnal data batches from
selected IGS reference stations can be further reduced to 2–3 cm (3d) for weekly smoothed averages. GPS data sets collected
in Ghana (Africa) reveal a typical level of 10 cm of deviation that must be anticipated under average conditions. Looking
at the future of GNSS, the European Galileo system will, in contrast to GPS, provide the broadband signal E5 that is by far
less affected by multipath thus providing rather precise range measurements. Simulated processing runs featuring both high
ionospheric and tropospheric delay variations show a 3d position precision of 4 cm even for a data batch as short as just
1 h, whereas GPS L1/Galileo E1 performance is close to 13 cm for the same data set. 相似文献
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Integrated Traffic Management Systems (ITMS) need reliable, accurate, and real-time data. Travel time, speed, and delay are
three of the most important factors used in ITMS for monitoring, quantifying, and controlling congestion. GPS has recently
become available for civil applications. Because it provides real-time spatial and time measurements, it has an increasing
use in conducting different transportation studies. This article presents the application of GPS in collecting travel time,
speed, and delay information of 64 major roads in the state of Delaware. A comparative statistical analysis was performed
on data collected by GPS, with data collected simultaneously by the conventional method. The GPS data proved to be at least
as accurate as the data collected by the conventional method, and it was 50% more efficient in terms of manpower. Moreover,
the sample-size requirement was determined to maintain 95% confidence level throughout the controlled test. Benefiting from
the Geographic Information System's dynamic segmentation tool, our travel time, delay, and speed information were integrated
with other relevant traffic data. This was presented graphically on the Internet for public use. Statistical trend analysis
for the data collected in 1997, 1998, 1999, and 2000 are also presented and applications on the overall ITMS are discussed.
? 2002 Wiley Periodicals, Inc. 相似文献
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地面点的正常高可以通过GPS技术结合高精度、高分辨率的似大地水准面模型获得,以代替劳动强度大效率低的传统水准(或高程)测量。影响精度的因素有两个:GPS点大地高的测量精度和该点内插高程异常的精度。本文主要针对深圳市1km格网似大地水准面数据,利用克里金法内插拟合高程异常值,用实例说明克里金法在深圳市似大地水准面的应用中可以满足大比例尺数字化测图的需要。 相似文献
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The nearly nine-year continuous GPS data collected since 1 March 1999 from the Crustal Motion Observation Network of China(CMONOC) were consistently analyzed.Most of the nonlinear movements in the cumulative position time series pro-duced by CMONOC data center disappeared;and more accurate vertical terms and tectonic signals were extracted.Displacements caused by atmospheric pressure loading,nontidal ocean loading,soil moisture mass loading,and snow cover mass loading using the National Centers for Environmental Prediction(NCEP) Reanalysis I/II models and Estimation of the Circulation and Climate of the Ocean(ECCO) data can explain most of the vertical annual terms at many stations,while only parts can be explained at Lhasa and southern coastal sites,indicating that there are some deformation mechanisms that are still unknown or not modeled accurately.The remarkable differences in vertical position time series for short-baseline sites reveal that GPS stations can be greatly affected by lo-cal factors;and attention should be paid when explaining observed GPS velocity vectors. 相似文献
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Yunfeng Tian 《地球空间信息科学学报》2013,16(3):207-215
The nearly nine-year continuous GPS data collected since 1 March 1999 from the Crustal Motion Observation Network of China (CMONOC) were consistently analyzed. Most of the nonlinear movements in the cumulative position time series produced by CMONOC data center disappeared; and more accurate vertical terms and tectonic signals were extracted. Displacements caused by atmospheric pressure loading, nontidal ocean loading, soil moisture mass loading, and snow cover mass loading using the National Centers for Environmental Prediction (NCEP) Reanalysis I/II models and Estimation of the Circulation and Climate of the Ocean (ECCO) data can explain most of the vertical annual terms at many stations, while only parts can be explained at Lhasa and southern coastal sites, indicating that there are some deformation mechanisms that are still unknown or not modeled accurately. The remarkable differences in vertical position time series for short-baseline sites reveal that GPS stations can be greatly affected by local factors; and attention should be paid when explaining observed GPS velocity vectors. 相似文献
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在对GPS／GLONASS组合定位的周跳探测和修复方法进行深入研究的基础上，论述了适合于两种数据联合解算的GPS／GLONASS模糊度迭代处理方法及相应的基于FARA方法的整周模糊度固定方法。在现有BERNESE Ver4.0GSP数据处理软件的基础上，增加及改进了其中的若干模块，从而研制出组合定位系统高精度数据处理软件，并进行了试验计算。结果表明，所开发的组合定位系统数据处理软件内、外符合精度均达到mm级，证明了这种高精度相对定位理论、方法、软件的正确性和可行性。 相似文献
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中国大陆GPS基准站的时间序列特征 总被引：1，自引：0，他引：1
利用1999年3月至2002年3月期间“中国地壳运动观测网络”25个GPS基准站与周边国家IGS站的观测资料，进行了时间序列分析研究，并对提高GPS基准站的观测精度进行了探讨。结果表明，GPS基准站的时间序列具有一定的周期性，高程分量的周期性最为明显，GPS点位高程时间序列拟舍曲线的波峰和波谷出现的时间表现为区域性的不同。 相似文献