《气象与环境科学》征稿简则     

杜文娟  李建东 《气象与环境科学》2008,31(1):88-90

依据最新的大气分子光谱数据集(HITRAN 2004),利用逐线积分辐射传输模式,模拟计算了大气顶射出红外辐射光谱及其对大气CO2浓度变化的灵敏度,发现:大气CO2 4.3 μm吸收带,特别是2 2412 249 cm-1、2 2502 258 cm-1、2 2592 267 cm-1和2 3822 390 cm-1波段射出的红外辐射,随CO2浓度的增加而显著降低,且很少受其他大气成分变化干扰,因此特别适于用来遥感探测大气CO2浓度的变化.根据最优非线性反演方法,反演获得了015 km的大气CO2廓线,结果表明,利用上述4个通道的红外辐射值,可精确反演出自由对流层的CO2浓度变化.  相似文献   

重要天气自动化语音报警软件的研制   总被引：1，自引：1，他引：0  

谷秀杰  鲁坦  李周  张永涛  邵宇翔  王振亚  邵振平 《气象与环境科学》2008,31(Z1)

介绍了重要天气报文的格式及种类,以及如何利用Visual Basic编程语言对报文进行判别,提取重要天气报的相关信息,进行语音报警显示的方法.  相似文献   

Effects of a nuclear power plant thermal discharge on habitat complexity and fish community structure in Ilha Grande Bay, Brazil   总被引：1，自引：0，他引：1  

Tatiana Pires Teixeira  Leonardo Mitrano Neves  Francisco Gerson Araújo   《Marine environmental research》2009,68(4):188-195

Fish communities and habitat structures were evaluated by underwater visual censuses a rocky location impacted by thermal discharge (I) and at two control locations, one in a Sargassum bed (C1) and the other in a rocky shore with higher structural complexity (C2). Habitat indicators and fish communities exhibited significant differences between the impacted and control locations, with the impacted one showing a significant decrease in fish species richness and diversity, as well as a decrease in benthic cover. At the I location, only 13 fish species were described, and the average water temperature was 32 ± 0.4 °C, compared with 44 species at C1 (25.9 ± 0.3 °C) and 33 species at C2 (24.6 ± 0.2 °C). Significant differences in fish communities among locations were found by ANOSIM with Eucinostomus argenteus, Mugil sp. and Haemulon steindachneri typical of location I, while Abudefduf saxatilis, Stegastes fuscus and Malacoctenus delalandi were typical of the control locations. Our study shows that thermal pollution alters benthic cover and influences fish assemblages by altering composition and decreasing richness.  相似文献   

利用混合语言编程研制测量数据处理程序   总被引：1，自引：0，他引：1  

卓力格图 《大地测量与地球动力学》2000,20(1):67-72

FORTRAN适合于编制数值计算程序 ,但不易于编制菜单等用户界面。 VisualBasic的特点恰恰是易于编制用户界面。因此 Visual Basic和 FORTRAN的混合编程是许多程序员所关注的问题。本文详细介绍了如何用 Visual Basic和 FORTRAN混合编程研制测量数据处理程序 ,并以算例的形式给出了 WGS84坐标系下地心坐标转换到大地坐标 (XYZ→BLH)直接算法的源程序。  相似文献   

Abiotic predictors of fine sediment accumulation in lowland rivers     

Morwenna McKenzie  Judy England  Ian D.L.Foster  Martin A.Wilkes 《国际泥沙研究》2022,37(1):128-137

The delivery of excessive fine sediment (particles<2 mm in diameter) to rivers can cause serious deleterious effects to aquatic ecosystems and is widely acknowledged to be one of the leading contributors to the degradation of rivers globally.Despite advances in using biological methods as a proxy,physical measures remain an important method through which fine sediment can be quantified.The aim of this study was to provide further insights into the environmental variables controlling sediment ...  相似文献   

视觉里程计研究综述     

胡凯  吴佳胜  郑翡  张彦雯  陈雪超  鹿奔 《南京气象学院学报》2021,13(3):269-280

视觉里程计（Visual Odometry）作为视觉同步定位与地图构建技术（Visual Simultaneous Localization and Mapping）的一部分,主要通过相机传感器获取一系列拥有时间序列图像的信息,从而预估机器人的姿态信息,建立局部地图,也被称为前端,已经被广泛应用在了多个领域,并取得了丰硕的实际成果,它对于无人驾驶、全自主无人机、虚拟现实和增强现实等方面有着重要意义.本文在介绍经典视觉里程计技术框架模块中的各类算法的基础上,对近年来新颖的视觉里程计技术（VO）的研究和论文进行了总结,按照技术手段不同分为两大类——多传感器融合的视觉里程计（以惯性视觉融合为例）和基于深度学习的视觉里程计.前者通过各传感器之间的优势互补提高VO的精度,后者则是通过和深度学习网络结合改善VO的性能.最后通过比较视觉里程计现有算法,并结合VO面临的挑战展望了视觉里程计的未来发展趋势.  相似文献   

基于VB2008的电子水准测量数据处理程序的设计与实现     

蒲朝旭  余代俊 《四川测绘》2011,(4):171-174

本文主要介绍利用Microsoft Visual Basic 2008编写电子水准测量数据处理程序的方法,并通过对编写的电子水准测量数据处理程序的实际应用,证明该应用程序可以有效解决电子水准测量的数据传输、数据编辑、数据处理、数据整理、折线图绘制、测量等级检验等实际问题,且具有用户自定义和批处理功能,能有效地减少内业数据处理的工作量。  相似文献   

New vegetation type map of India prepared using satellite remote sensing: Comparison with global vegetation maps and utilities     

《International Journal of Applied Earth Observation and Geoinformation》2015

A seamless vegetation type map of India (scale 1: 50,000) prepared using medium-resolution IRS LISS-III images is presented. The map was created using an on-screen visual interpretation technique and has an accuracy of 90%, as assessed using 15,565 ground control points. India has hitherto been using potential vegetation/forest type map prepared by Champion and Seth in 1968. We characterized and mapped further the vegetation type distribution in the country in terms of occurrence and distribution, area occupancy, percentage of protected area (PA) covered by each vegetation type, range of elevation, mean annual temperature and precipitation over the past 100 years. A remote sensing-amenable hierarchical classification scheme that accommodates natural and semi-natural systems was conceptualized, and the natural vegetation was classified into forests, scrub/shrub lands and grasslands on the basis of extent of vegetation cover. We discuss the distribution and potential utility of the vegetation type map in a broad range of ecological, climatic and conservation applications from global, national and local perspectives. We used 15,565 ground control points to assess the accuracy of products available globally (i.e., GlobCover, Holdridge’s life zone map and potential natural vegetation (PNV) maps). Hence we recommend that the map prepared herein be used widely. This vegetation type map is the most comprehensive one developed for India so far. It was prepared using 23.5 m seasonal satellite remote sensing data, field samples and information relating to the biogeography, climate and soil. The digital map is now available through a web portal (http://bis.iirs.gov.in).  相似文献   

Measuring visual pollution by outdoor advertisements in an urban street using intervisibilty analysis and public surveys     

Szymon Chmielewski  Danbi J. Lee  Piotr Tompalski  Tadeusz J. Chmielewski  Piotr Wężyk 《International journal of geographical information science》2016,30(4):801-818

Debates on the encroaching commercialization of public space by outdoor advertising highlight its possible negative impact on local quality of life and enjoyment of public spaces. These overstimulating outdoor advertisements are often considered a source of visual pollution, but cities have no standard way of measuring where it exists and its local impact, and thus cannot regulate it effectively. This study illustrates that visual pollution can be measured in a useful way by relating public opinion to the number of visible advertisements (intervisibility analysis). Using a 2.5D outdoor advertisement (OA) dataset (location and height) of a busy urban street in Lublin, Poland, this preliminary experiment translates visibility into visual pollution. It was found that streetscape views with more than seven visible OAs created visual pollution in this case study. The GIS-based methodology proposed could provide Lublin officials with a basic tool to assess and manage visual pollution, by informing permitting decisions on OAs.  相似文献   

高速铁路综合图的自动生成和输出     

程耀东  程璐  谭冬生 《测绘科学》2016,41(11):166-170

针对普铁综合图绘制系统无法实现高铁双线并行综合图的绘制问题,提出了高铁综合图自动生成和输出的方法。通过在Auto LISP中使用ActiveX对象与Microsoft Excel对象,实现了Excel数据文件的导入和数据转换;基于高铁综合图信息,以Visual LISP语言实现了高铁综合图的自动生成;采用图形裁剪算法,实现了长条形综合图的自动分幅;运用虚拟打印技术,实现了分幅图的批量打印或PDF文件生成。实验结果表明:所提方法不仅可以快速高效地进行数据处理和综合图自动生成,还能准确地进行图形自动分幅和输出。研究结果对铁路基础设施、综合维修、列车运行等方面的信息化研究具有重要的参考价值。  相似文献