Photoshop软件在处理遥感影像中的一些应用   总被引：1，自引：0，他引：1  

韩涛  李新峰  李红  王蜜蜂 《东北测绘》2012,(10):121-123,126,129

影像处理专业软件Photoshop在遥感影像处理中应用越来越广泛,本文主要通过Photoshop软件对遥感影像的批处理、色彩处理以及引进插件扩展技术,阐述Photoshop软件在遥感影像处理中的应用。  相似文献   

陕西省应急快速制图地理信息系统研究     

张靖  王祖亮 《东北测绘》2012,(10):124-126

在各类应急事件中,快速的提供应急图件是应急测绘保障的内容之一。本文在得出目前技术条件和数据条件已经成熟的基础上,通过对应急快速制图流程的分析和整理,综合考虑用户对应急响应时间的需求,确立了不同时间要求的出图流程、系统体系结构、系统技术路线、系统功能设计。文章所研究的陕西省应急快速制图地理信息系统加快了应急响应的速度,提高了工作效率,满足了应急工作需要,具有很大的应用前景和推广价值。  相似文献   

ADS 80数码航摄系统应用及精度探讨     

王春青  李伟东 《东北测绘》2012,(10):177-179

以项目部分区域为实例,通过项目工作流程及分阶段作业细节、进度状况、精度指标等的统计,阐述了使用ADS 80数码航摄系统,用少量像控点就可进行加密和测图,大大减少了外业控制测量工作及成本,成果满足大比例地形图精度要求,并能快速提高生产进度,缩短成图周期。  相似文献   

2000年以来浙江省海洋产业结构演化特征与态势     

胡王玉  马仁锋  汪玉君 《云南地理环境研究》2012,24(4):7-13,24

浙江省是海洋经济大省,但并非强省,近10年来浙江海洋经济一直位居全国第4或第5位。海洋经济发展,深受其产业结构及布局影响。以浙江海洋产业结构演化特征为研究内容,运用2001～2010年海洋经济统计数据,采用数理统计分析与演化经济地理学方法探讨浙江海洋产业结构演化的路径依赖、创造与锁定等的具体表现。研究表明:(1)浙江海洋产业部门立足资源与区位优势趋向于多样化、产业结构渐趋合理化,但海洋产业科技含量较低、新兴海洋产业发展缓慢;(2)浙江海洋渔业、海洋交通运输业、滨海旅游业、海洋船舶工业、海洋盐业的演化过程呈现鲜明的资源依赖性和历史路径惯性作用,而海水利用业、海洋电力、海洋生物医药产业则是内生技术研发与应用发展的典范;(3)浙江部分海洋产业路径锁定解除模式与窗口选择不合时宜,如海洋交通运输业与海洋盐业等。因此,破解浙江海洋产业结构演化过程路径锁定的最佳模式是以经济社会环境综合改善集聚海洋人才,形成本土研发创新能力,攻克海洋产业核心技术与管理创新。  相似文献   

Oscillations of rapidly rotating stratified neutron stars     

A. Passamonti  B. Haskell  N. Andersson  D. I. Jones  I. Hawke 《Monthly notices of the Royal Astronomical Society》2009,394(2):730-741

We use time evolutions of the linear perturbation equations to study the oscillations of rapidly rotating neutrons stars. Our models account for the buoyancy due to composition gradients and we study, for the first time, the nature of the resultant g modes in a fast spinning star. We provide detailed comparisons of non-stratified and stratified models. This leads to an improved understanding of the relationship between the inertial modes of a non-stratified star and the g modes of a stratified system. In particular, we demonstrate that each g mode becomes rotation dominated, i.e. approaches a particular inertial mode, as the rotation rate of the star is increased. We also discuss issues relating to the gravitational wave driven instability of the various classes of oscillation modes.  相似文献   

Late-time photometry of two nearby type II-P supernovae： 2004dj and 2004et     

Tian-Meng Zhang Xiao-Feng Wang Xu Zhou Jun Ma Zhao-Ji Jiang Jiang-Hua Wu Zhen-Yu Wu Stephane Basa 《天体物理学报》2009,(7):783-790

We present late-time photometry for two bright type II-P supernovae （SNe） 2004dj and 2004et, extending over 400 d after the explosion, which are measured with a set of intermediate-band filters that have the advantage of tracing the strength variations of some spectral features. Although these two SNe II-P exhibit similar photometric evolution at earlier times, they diverge during the nebular phase. SN 2004dj shows a slow late-time decline rate with - 0.7 ±0.1 mag （100d）^-1 during the period ranging from t ≈ 200 - 300 d after the explosion, while SN 2004et shows a much faster decline rate at a comparable phase, e.g., 1.3 ± 0.1 mag （100d）^-1. The steeper decay rate seen in SN 2004et is likely due to dust formation in the explosion ejecta. Based on intermediate-band photometry, we derived the evolution of the feature lines [e.g., Hα] of SNe 2004dj and 2004et which are similar in flux at comparable phases but perhaps with significantly different decay rates. The origin of the observed variations in the continuum and the feature lines is briefly discussed.  相似文献   

Brightness temperature for 166 radio sources     

Jun-Hui Fan Yong Huang Yu-Hai Yuan Jiang-He Yang Yi Liu Jun Tao Ying Gao Tong-Xu Hua Rui-Guang Lin Jiang-Shui Zhang Jing-Yi Zhang Yi-Ping Qin 《天体物理学报》2009,(7):751-760

Using the database of the University of Michigan Radio Astronomy Observatory （UMRAO） at three radio frequencies （4.8, 8 and 14.5 GHz）, we determined the short-term variability timescales for 166 radio sources. The timescales are 0.15d （2007＋777） to 176.17 d （0528-250） with an average timescale of Atobs = 17.1 4- 16.5 d for the whole sample. The timescales are used to calculate the brightness temperatures, TB. The value of log TB is in the range of log TB = 10.47 to 19.06 K. In addition, we also estimated the boosting factor for the sources. The correlation between the polarization and the Doppler factor is also discussed.  相似文献   

Cooling of hybrid stars with spin down compression     

Miao Kang  Xiao-Dong Wang  Na-Na Pan 《中国天文和天体物理学报》2009,9(12)

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Automated spectral classification using template matching     

Fu-Qing Duan Rong Liu Ping Guo Ming-Quan Zhou Fu-Chao Wu 《中国天文和天体物理学报》2009,9(3)

An automated spectral classification technique for large sky surveys is pro-posed. We firstly perform spectral line matching to determine redshift candidates for an observed spectrum, and then estimate the spectral class by measuring the similarity be-tween the observed spectrum and the shifted templates for each redshift candidate. As a byproduct of this approach, the spectral redshift can also be obtained with high accuracy. Compared with some approaches based on computerized learning methods in the liter-ature, the proposed approach needs no training, which is time-consuming and sensitive to selection of the training set. Both simulated data and observed spectra are used to test the approach; the results show that the proposed method is efficient, and it can achieve a correct classification rate as high as 92.9%, 97.9% and 98.8% for stars, galaxies and quasars, respectively.  相似文献   

Summer Asian-Pacific Oscillation and Its Relationship with Atmospheric Circulation and Monsoon Rainfall   总被引：1，自引：0，他引：1       下载免费PDF全文

ZHAO Ping  CHEN Junming  XIAO Dong  NAN Sulan  ZOU Yan  ZHOU Botao 《Acta Meteorologica Sinica》2008,22(4):455-471

Using the ERA-40 data and numerical simulations, this study investigated the teleconnection over the extratropical Asian-Pacific region and its relationship with the Asian monsoon rainfall and the climatological characteristics of tropical cyclones over the western North Pacific, and analyzed impacts of the Tibetan Plateau （TP） heating and Pacific sea surface temperature （SST） on the teleconnection. The Asian-Pacific oscillation （APO） is defined as a zonal seesaw of the tropospheric temperature in the midlatitudes of the Asian-Pacific region. When the troposphere is cooling in the midlatitudes of the Asian continent, it is warming in the midlatitudes of the central and eastern North Pacific; and vice versa. The APO also appears in the stratosphere, but with a reversed phase. Used as an index of the thermal contrast between Asia and the North Pacific, it provides a new way to explore interactions between the Asian and Pacific atmospheric circulations. The APO index exhibits the interannual and interdecadal variability. It shows a downward trend during 1958-2001, indicating a weakening of the thermal contrast, and shows a 5.5-yr oscillation period. The formation of the APO is associated with the zonal vertical circulation caused by a difference in the solar radiative heating between the Asian continent and the North Pacific. The numerical simulations further reveal that the summer TP heating enhances the local tropospheric temperature and upward motion, and then strengthens downward motion and decreases the tropospheric temperature over the central and eastern North Pacific. This leads to the formation of the APO. The Pacific decadal oscillation and El Nino/La Nina over the tropical eastern Pacific do not exert strong influences on the APO. When there is an anomaly in the summer APO, the South Asian high, the westerly jet over Eurasia, the tropical easterly jet over South Asia, and the subtropical high over the North Pacific change significantly, with anomalous Asian monsoon rainfall and tropical cyclon  相似文献