基于遥感影像的土地动态变化监测

土地利用/覆盖变化是目前研究全球及区域环境的一个重要领域,在城镇化加速的今天,城镇的土地利用格局也发生了飞速的变化。本文通过其一研究区内的Landsat TM遥感影像进行处理,获取了2007~2016年10个时相土地利用/覆盖信息,通过不同的预测模型对监测到的数据进行处理及比较,根据相应的最优预测方法预测了2017~2019年南昌市各土地类型的数据,由此研究并探讨了南昌市土地利用/覆盖的时空格局变化。     

BDS轨道完备性监测设计与实现

针对北斗卫星导航系统(BDS)完备性研究较少的现状,该文提出了一种导航星历中轨道观测数据的完备性监测新方法。采用轨道积分方法分析了北斗卫星的轨道残差均方根值;通过概率统计的方法,分别计算所有北斗卫星的轨道残差极限误差值(告警限差),剔除误差超限甚至粗差卫星,实现事后轨道完备性监测。另外通过比较分析剔除监测标记出的误差卫星之前和之后对测站精密单点定位的影响,验证完备性的风险性。最后通过实测数据对该算法进行了验证和分析。实验结果表明:该算法可以实现卫星轨道的监测示警,标记误差卫星,达到轨道完备性监测效果。     

GNSS/INS辅助空三在大比例尺低空摄影测量中的研究

利用小型低空航摄平台和非量测小相幅相机,搭载动态GNSS/INS组合系统进行空三加密,研究无人机搭载GNSS/INS辅助在不同分辨率、不同基线数量条件下的像控点布设以及空三加密,并对其平面精度、高程精度进行分析,以实现利用少量地面控制点进行大比例尺地形图测图。     

基于DMSP/OLS夜间灯光数据进行提取的实证研究——以福州为例

DMSP/OLS数据能够观测到夜间灯光,因而被广泛应用于人类活动与城市扩展研究。本文以福州市为例,分析比较现有夜光数据的城区提取方法。通过实例分析,从阈值设定方面进行讨论,比较各方法的优缺点,可为夜间灯光数据在提取城市区域方面提供借鉴。     

Optimization of spatial statistical approaches to identify land use/land cover change hot spots of Pune region of Maharashtra using remote sensing and GIS techniques

This study investigated land use/land cover change (LULCC) dynamics using temporal satellite images and spatial statistical cluster analysis approaches in order to identify potential LULCC hot spots in the Pune region. LULCC hot spot classes defined as new, progressive and non-progressive were derived from Gi* scores. Results indicate that progressive hot spots have experienced high growth in terms of urban built-up areas (20.67% in 1972–1992 and 19.44% in 1992–2012), industrial areas (0.73% in 1972–1992 and 3.46% in 1992–2012) and fallow lands (4.35% in 1972–1992 and ?6.38% in 1992–2012). It was also noticed that about 28.26% of areas near the city were identified as new hot spots after 1992. Hence, non-significant change areas were identified as non-progressive after 1992. The study demonstrated that LULCC hot spot mapping through the integrated spatial statistical approach was an effective approach for analysing the direction, rate, spatial pattern and spatial relationship of LULCC.     

Algorithm for Harmonic Tidal Analysis along T/P Tracks： Taking Differences of Observed Sea Surface Heights at Adjacent Points as Observations

An algorithm （differential mode） is presented for the improvement of harmonic tidal analysis along T/P tracks, in which the differences between the observed sea surface heights at adjacent points are taken as observations. Also, the observation equations are constrained with the results of the crossover analysis; the parameter estimations are performed at 0.1° latitude intervals by the least squares. Cycle 10 to 330 T/P altimeter data covering the China Sea and the Northwest Pacific Ocean （2°-50° N,105°-150° E） are adopted for a refined along-track harmonic tidal analysis, and harmonic constants of 12 constituents in 8 474 points are obtained, which indicates that the algorithm can efficiently remove non-tidal effects in the altimeter observations, and improve the precision of tide parameters. Moreover, parameters along altimetry tracks represent a smoother distribution than those obtained by traditional algorithms. The root mean squares of the fitting errors between the tidal height model and the observations reduce from 11 cm to 1.3 cm.     

CHRIS／PROBA高光谱数据的预处理

针对CHRIS／PROBA高光谱遥感数据的特点,对CHRIS影像进行去条带处理、辐射校正、大气校正等预处理,获得较好质量的影像,为影像的进一步分析和实际应用提供保障。     

河南理工大学校园导航系统的设计与实现

利用了SuperMap Objects组件,构建了C/S模式的河南理工大学校园导航系统,实现了信息查询、路径导航、办事指南、地图与数据编辑、数据输出、用户管理及三维虚拟校园导航等功能,并提供了与现有校园系统集成的接口.     

捷联惯导MATLAB／Simulink仿真实现

阐述了MATLAB/Simulink的主要特点,设计了基于MATLAB/Simulink的捷联惯性导航仿真模型,给出了仿真实例和分析结果,表明利用MATLAB/Simulink可以提高仿真效率。     

利用GPS水准点精化局部CQG2000

CQG2000模型的精度仍不能满足中、大比例尺的测图需要,如何充分利用现有成果,提高其价值和实用性,是目前需要迫切解决的问题。本文提出了通过加密GPS水准点来提高现有CQG2000精度的方法,并研究了GPS水准点数目和分布对提高结果的影响。