共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
3.
为解决黑龙江省部分地区电台RTK和网络RTK均无法为项目提供厘米级定位服务的问题,引入全球卫星导航定位系统(简称GNSS)动态数据后处理模式。基于黑龙江省卫星定位连续运行综合服务系统(简称“HLJCORS”)分别开展了车载GNSS动态数据后处理和静态GNSS观测数据后处理试验,验证了GNSS动态数据后处理方法可以使点位精度达到厘米级,满足测绘项目要求。 相似文献
4.
《测绘与空间地理信息》2017,(10)
地基雷达IBIS-S系统在微变形监测领域展现出了巨大优势。本文介绍了IBIS-S系统的工作原理,同时利用模拟变形实验验证了该系统的测量精度。数据处理过程中分别考虑了静杂波相位分量和环境扰动对变形信号的影响,并进行了去除处理。实验结果表明,变形数据经过处理后的精度可以达到亚毫米级,能满足高精度的微变形监测任务需求。 相似文献
5.
6.
地基SAR(synthetic aperture radar)可实现高精度的小区域性连续形变监测。为研究其形变探测能力与精度,建立了一套精度验证平台和系统。在楼顶布设不同位置分布的角反射器,并采用步进平台控制角反射器模拟不同数值形变,形变角反射器与稳定点及楼顶表面构成小区域二维形变场,利用IBIS-L(image by interferometric system-landslides)系统完成形变监测与分析。实验结果表明,当角反射器发生毫米级形变时,地基干涉雷达IBIS-L系统形变探测平均精度为0.27 mm,而角反射器发生亚毫米级形变时,其形变探测平均精度为0.11 mm;该系统可以实现小区域性的亚毫米级形变探测,对于缓慢微小变化,其具有更好的形变探测能力与可靠性。 相似文献
7.
GVG农情采样系统及其应用 总被引:13,自引:8,他引:13
介绍了通过对GPS、VIDEO摄像头、GIS的综合集成 ,用于野外农作物采样的信息快速采集、定位和处理分析系统 ,简称为GVG农情采样系统。系统包括影像采集卡、视频摄像头、GPS接收卡、GPS天线和工控计算机 ,在野外采集时采用汽车为主要工作平台 ,以各级公路为样线进行动态采样。系统工作时实时采集GPS信号 ,捕捉视频影像 ,同时根据GPS位置自动获得GIS属性信息 ,并自动记录在后台数据库。野外工作结束后 ,系统提供的功能允许操作人员对每条记录的照片中各类农作物所占比例进行赋值 ,统计单元内各种作物的分类成数 ,包括采样线、县级、农业区划级和省级单元。GVG系统的自动数据采集方式和GIS支持下的图像分析和统计方法提高了数据的采集和室内数据分析的效率 ,同时保证了采样的精度 ,经过不同地区的精度检验 ,作为“中国农情遥感监测系统”的重要组成部分 ,在全国范围内对大宗农作物分类成数的监测精度达到 95 %以上。 相似文献
8.
介绍了煤概查区收集已知资料,并对已知资料分析后,确保已知资料准确无误后,如何利用已知资料建立D级控制网,如何控制D级控制网网形质量,以及控制网精度的评定,误差的分析,精度的分析,基线和平差的处理,高程拟合的方法。 相似文献
9.
10.
AUSPOS在线定位系统研究分析 总被引:1,自引:0,他引:1
基于网络的在线GPS定位服务系统提高了测量精度和作业效率,极大地方便了用户.AUSPOS是澳大利亚有关专业部门开发的在线定位服务系统,具备处理静态双频接收机RINEX格式的GPS数据的能力.试算表明:AUSPOS使用2h的数据便能获得cm级的定位精度(3D),8h就可以获得水平方向优于1cm和垂直方向优于2cm的定位精度.利用24h的观测数据可以获得mm级的内符合精度和1cm左右的外符合精度.AUSPOS这类高性能在线定位服务系统在GPS基准站建设、GPS高程测量和GPS控制网解算等领域有着很大的实际应用价值. 相似文献
11.
房价与地价的影响因素多且因素之间相关关系复杂,本次研究通过收集整理重庆市房价与地价的相关数据,采用政策因素、宏观区位因素、微观区位因素、平均容积率因素、规划因素、路网密度因素来研究房价与地价之间的关系,通过建立因素间的通径图构建房价地价的结构方程模型,详细分析了各因素之间的影响关系. 相似文献
12.
13.
14.
Chris Lonergan 《制图学和地理信息科学》2016,43(2):87-102
This article explores the ways in which researchers conceptualize and visualize visibility in spatial research – using isovists and visualscapes. We review how visibility analyses have been used in spatial analysis and visualization. We dissect the geometric conceptualization of isovists, and geometric relationships between isovist origins and targets. From this, we develop an expanded typology of isovists based on geometries of visibility and the relationships between an observer and the observed. This typology differentiates panoptic isovists, constrained isovists, and targeted isovists. We apply these isovist examples to urban privacy and surveillance to ground the new conceptual framework. We conclude with a discussion surrounding future research and conceptual development needed to advance visualscapes and visibility analysis. 相似文献
15.
Classification comparisons between dual-pol, compact polarimetric and quad-pol SAR imagery 总被引:1,自引:0,他引:1
T.L. Ainsworth J.P. Kelly J.-S. Lee 《ISPRS Journal of Photogrammetry and Remote Sensing》2009,64(5):464-471
We present a study of the polarimetric information content of dual-pol imaging modes and dual-pol imaging extended by polarimetric scattering models. We compare Wishart classifications both among the partial polarimetric datasets and against the full quad-pol dataset. Our emphasis is the inter-comparisons between the classification results based on dual-pol modes, compact polarimetric modes and scattering model extensions of the compact polarimetric modes. We primarily consider novel dual-pol modes, e.g. transmitting a circular polarization and receiving horizontal and vertical polarizations, and the pseudo-quad-pol data derived from polarimetric scattering models based on dual-pol data. We show that the overall classification accuracy of the pseudo-quad-pol data is essential the same as the classification accuracy obtained directly employing the underlying dual-pol imagery. 相似文献
16.
17.
《制图学和地理信息科学》2013,40(2):129-138
We examine some benefits of using the medial axis as a centerline for rivers and lakes. One benefit, automatic centerline generation, has been used for many years. We show that additional benefits can be derived from the geometric relationships between the medial axis and the riverbanks or lakeshores. These include area estimates, association of centerline analysis to banks, and definition of opposite for riverbanks. We also report on our experience at approximating the medial axis with a Voronoi diagram of point sites. 相似文献
18.
19.
In this study, we tested whether terrain-based visibility modelled from a remotely sensed ASTER Digital Elevation Model (DEM) explains sable flight initiation distance (FID) better than vegetation-based visibility measured in the field. We also tested whether the effect of hunting on sable FID varies with spatial scale. We first performed a linear regression analysis relating FID to standardized coefficients of both vegetation- and terrain-based visibility where the variable with the larger coefficient was the better predictor of FID. We latter performed an analysis of covariance (ANCOVA) comparing the slopes relating FID to both measures of visibility, first at the large scale and later at the small scale within the hunting area. Our results suggest that remotely sensed terrain-based visibility predicts the FID of sable better than vegetation-based visibility. We also found that the effect of hunting on sable FID varies with spatial scale. 相似文献
20.
以城市交通网络为背景,提出了一种新型的基于受限网络的时空索引NBR-tree。NBR-tree针对城市交通网络中移动对象特有的运动方向、进入模式等特点,改进了目前流行的MON-tree索引。给出了NBR-tree的索引结构、操作算法以及实验分析。实验表明,NBR-tree可以有效地支持对象移动过程中的最近邻查询,并且具有比MON-tree更好的轨迹查询性能。 相似文献