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Knowledge Discovery by Spatial Clustering Based on Self-Organizing Feature Map and a Composite Distance Measure
Self-Organizing Feature Map Spatial Clustering Knowledge Discovery Data Mining
2015/12/2
This paper proposes a spatial clustering model based on self-organizing feature map and a composite distance measure, and studies the knowledge discovery from spatial database of spatial objects with ...
A Novel Vector Field Data Mining Approach: Extraction of Front Based on Physical Features of Target
Vector Field Data Mining Physical Feature Front Extraction Fuzzy Clustering
2015/12/2
The explosive growing of earth observing data needs to have relative efficient data processing methods. This paper aims at the processing and analysis of large volume of vector field data acquiring fr...
Research on Change-of-Feature Based Spatio-Temopral Object Relational Model
Feature Feature Change Event State Orient-Relational Data Model Spatio-Temporal Data Model
2015/12/1
The spatio-temporal data is our cognition to external matter and the spatio-temporal data model is the fundamental basic to manage the spatio-temporal data. The spatio-temporal object is always changi...
Spatial and Dynamic Modelling Techniques for Land Use Change Dynamics Study
GIS Cellular Automata Land Use Change Land degradation Multi Criteria Decision Making
2015/12/1
This paper presents a prototype of a simulation model based on cellular automata (CA), and multi criteria evaluation, integrated with Geographic Information System (GIS). Multi criteria evaluation pro...
Deriving Spatio-Temporal Relations from Simple Data Structure
Data Structure Operation Query Object Spatial Temporal
2015/12/1
A spatiotemporal data model is incomplete without three components: classes, consistency constraints, and operators. Classes define the structure of the model, constraints enforce consistency in the m...
Dynamic Cartographic Representation of Spatio-Temporal Data
Spatio-temporal Database Spatio-temporal Change Pattern Dynamic symbol base
2015/12/1
As efforts grow to develop spatio-temporal database systems and temporal geographic information systems that are capable of conveying how geographic phenomena change, it is important to associate the ...
针对制备衍射光栅时刻划平台倾斜导致的光栅槽型误差,提出了一种基于图像清晰度检测与电动倾斜台调节的光栅刻划平台在线调平装置。建立了图像清晰度与光栅刻划平台倾角间关系的模型,应用该模型,控制光栅刻划平台在一定范围内实现了闭环动态调平。对上述理论研究进行了试验验证。试验结果表明,该调平装置简单可行;对于50 mm×50 mm的光栅毛胚,调平装置可控制刻划平台的水平倾角在4"以内,满足光栅刻划对平台定位精...
PSWF调制信号功率谱旁瓣抑制方法
椭圆球面波函数 功率谱 带通滤波器 Kaiser窗
2015/11/26
多路PSWF时域正交调制信号功率谱主瓣扩展和旁瓣较高，严重影响了系统的功率利用率和频谱效率。针对这一问题，从带通滤波器的窗函数设计入手，提出了一种正交PSWF调制信号的带通滤波器设计方案，有效抑制了功率谱的旁瓣功率，提高了调制信号的带内能量聚集性。理论和仿真结果验证了该方法的有效性。
建立了蒸发器支撑板板孔精密测量系统,并提出了基于边缘约束条件的轮廓参量测量方法.首先采用图像处理技术将待测目标转化为二维离散坐标点,计算其最小外接矩形并对轮廓进行预定位;然后将轮廓分割成相互重合的"扩展邻域轮廓",建立以曲率角为原则的边缘约束算法对各轮廓段精确定界,实现对轮廓参量的精密测量.实验和误差分析表明,该系统测量准确度优于0.02 mm,对具有复杂轮廓的零件参量测量有参考价值.
基于胸鳍辅助推进的“仿生机器鱼”
水中机器人 仿生机器鱼 尾鳍推进 胸鳍辅助推进
2015/11/24
为了更好的培养学生“知行合一”的创新实践能力,本文依托校机器人俱乐部活动,结合理论学习、探索并实践的学员科技创新训练全过程,着眼于仿生机器鱼的推动机理,创新性地利用胸鳍作用配合辅助尾鳍推进,并通过实验验证。结果表明：最终实现的胸鳍与尾鳍推进模式相结合的“仿生机器鱼”能够更灵活、更精确的实现浅水中前进、上升下潜以及盘旋、回转和制动,作品在2015国际水中机器人大赛中获得优异成绩。
Contribution of Integrated Remote Sensing System (SINAT) to Territorial Management: Towards the Strengthening of the National System of Land Observation.
Digital images Airborne and space capabilities Earth observation system
2015/11/20
SINAT (Integrated National Remote Sensing System) is a system that incorporates space and airborne sensors to capture, process and distributes accurate geographic data. It integrates efforts from dive...
Image Coregistration in SAR Interferometry
SAR Interferometry Co-registration Interferometric SAR (InSAR)
2015/11/20
A critical procedure in Synthetic Aperture Radar (SAR) Interferometric (InSAR) processing was studied: SAR image coregistration. Two pairs of ERS-1/2 SAR tandem data, representing diverse terrain type...
Research on SAR Image Matching Technology based on SIFT
SAR Curvelet De-noising SIFT Image Matching
2015/11/20
Image matching is one of the key technologies in remote sensing image fusion and navigation. Image matching of Synthetic Aperture Radar (SAR) is a process to find relationship of pixels in many SAR im...
Performance CharactErization of an Airborne LIDAR System: Bridging System Specifications and Expected Performance
LIDAR data acquisition specifications impact analysis parameters performance accuracy understanding
2015/11/20
Airborne laser scanning, the preferred operational tool in remote sensing, surveying, and mapping, is demonstrating outstanding capabilities in generating high-accuracy spatial data with superior effi...
Wavelet Speckle Reduction for SAR Imagery Based on Edge Detection
Image processing Filtering Feature detection Geography Image understanding
2015/11/20
This paper introduces a wavelet transform speckle reduction algorithm for Synthetic Aperture Radar (SAR) imagery based on edge detection. Existing speckle algorithm can efficiently reduce the speckle ...