点云滤除临时动地物构建表面模型方法探讨

针对获取高精度数字表面模型(DSM)效率不高的现状,文章研究了基于机载激光雷达点云滤除临时动地物的方法:通过对TIN迭代滤波与聚类进行改进,提出了两种滤除临时动地物构建DSM的方法,第一种是基于数据流TIN迭代与临时动地物的特征,直接滤除临时动地物构建DSM;第二种是基于数字高程模型(DEM),逆向添加滤除临时动地物点的非地面点构建DSM。最后通过实验证明这两种方法均可较好地滤除临时动地物构建DSM。     

基于三维激光扫描数据的地铁隧道断面测量

地铁主体施工完毕后为了对线路进行调线调坡,需要对地铁隧道进行断面测量,三维激光扫描与常规测量方法相比具有非接触式测量,可高密度采集空间三维点云数据等特点,为地铁断面测量提供了新的途径。本文基于Leica Scanstation 2扫描仪分析了三维激光扫描点云数据采集步骤和数据处理流程,阐述了基于点云数据的地铁断面测量方法,分析了三维激光扫描技术在隧道断面测量中应用的可行性。研究结果表明,这种高密度、高精度的隧道断面能够满足地铁调线调坡等方面的技术要求。     

基于嫦娥二号CCD数据的核线影像生成方法

对于缺少嫦娥二号激光数据问题,本文提出了基于RPC有理多项式系数(Rational Polynomial Coefficient)的嫦娥二号CCD影像的核线影像生成方法.它利用了嫦娥一号激光高度数据与嫦娥二号CCD影像控制点相结合的方法生成月面控制点,通过月面控制点建立正确的校正公式,获得分辨率较高的正射影像图,并在此基础上提取核线影像.     

Experimental research on physical properties of saline soil subgrade filler in Chaerhan region

In order to improve the engineering stability of saline soil of high chloride content in the Chaerhan salt lake region, six typical characteristics saline soil samples were selected, and tests on their...     

江苏省煤炭资源现状及开发利用建议

通过对江苏省煤炭资源特征及利用现状分析,在安全、高效、环保优先的前提下,建议选择新兴煤炭地下气化高新技术,开启江苏省煤炭资源开发利用的新模式,详细分析了采用煤炭地下气化高新技术开发利用江苏省煤炭资源的五大优点,为江苏省煤炭资源开发利用探求一条新路子。     

中亚天山—帕米尔地区成矿地质背景

中亚天山—帕米尔地区地处亚欧大陆腹地,跨古亚洲、特提斯两大全球性构造域,是哈萨克斯坦—准噶尔、卡拉库姆—塔里木、中伊朗—冈底斯、印度四大古板块的结合部位,地质构造复杂,矿产资源丰富。自中新太古代(或古元古代)以来分为5大演化阶段:1太古宙—古元古代演化阶段,本区古陆可能是组成Pangea-Ⅳ泛大陆的一部分;2长城纪—青白口纪泛大陆裂解事件导致了西昆仑地区第一次大规模的成矿作用,新元古代超大陆汇聚形成阶段,中天山地区广泛沉积了一套文德系含炭质岩系,形成金的矿源层,为后期大规模金的成矿作用提供了物质基础;3新元古代超大陆裂解及古亚洲洋—原特提斯洋演化阶段,岩浆活动强烈深部壳幔物质交换频繁,尤其是晚泥盆世—早中二叠世碰撞后伸展期,是区内最重要的成矿期;4研究区工作程度低(部分地区为空白区),特提斯洋演化阶段矿床发现较少,但找矿潜力巨大;5欧亚大陆形成后的后造山阶段,伴随着造山带强烈的挤压、褶皱、抬升、走滑、推覆等构造活动,岩浆作用十分发育,形成了一系列与韧性剪切构造有关的金矿化,以及与中酸性岩浆热液活动有关的铁、铜、多金属、锂铍(铌钽)、钨、锡、钼等矿产。     

Optical observations of the broad-lined type Ic supernova SN 2012ap

The optical observations of the type Ic supernova(SN Ic) SN 2012 ap in NGC 1729 are presented. A comparison with other SNe Ic indicates that SN 2012 ap is highly reddened(with E(B- V)host～0.8 mag) and may represent one of the most luminous SNe Ic ever observed, with an absolute V-band peak magnitude of ～-19.3±0.5 mag after extinction correction. The near-maximum-light spectrum shows wide spectral features that are typical of broad-lined SNe Ic. One interesting feature in the spectrum is the appearance of some narrow absorption features that can be attributed to the diffuse interstellar bands, consistent with the large reddening inferred from the photometric method. Based on the light curves and the spectral data, we estimate that SN 2012 ap produced a56 Ni mass of ～ 0.3 ± 0.1M in the explosion, with an ejecta mass of 2.4+0.7-0.7M and a kinetic energy of E5K= 1.1+0.4-0.4× 102 erg. The properties of its progenitor are also briefly discussed.     

Characteristics of Fengyun-4A Satellite Atmospheric Motion Vectors and Their Impacts on Data Assimilation

The high observation efficiency, scanning speed and observation frequency of the Fengyun-4A (FY-4A) satellite indicates the progress of Chinese geostationary meteorological satellites. The characteristics of FY-4A atmospheric motion vectors (AMVs) derived from the high-level water vapor (WV-High) channel, mid-level water vapor (WV-Mid) channel, and infrared (IR) channel of FY-4A are analyzed, and their corresponding observation errors estimated. Then, the impacts of single-channel and multi-channel FY-4A AMVs on RMAPS-ST (the Rapid-refresh Multi-scale Analysis and Prediction System—Short Term) are evaluated based on one-month data assimilation cycling and forecasting experiments. Results show that the observation errors of FY-4A AMVs from the three channels have an explicit vertical structure. Results from the cycling experiments indicate that the assimilation of AMVs from WV-High produces more apparent improvement of the wind in the upper layer, while a more positive effect in the lower layer is achieved by the assimilation of AMVs from IR. Furthermore, the assimilation of AMVs from IR is more skillful for medium and moderate precipitation than from other channels owing to the good quality of data in the lower layer in the AMVs from IR. Assimilation of FY-4A AMVs from the three channels could combine the advantages of assimilation from each individual channel to improve the wind in the upper, middle and lower layers simultaneously.