A new MODIS daffy cloud free snow cover mapping algorithm on the Tibetan Plateau

Because of similar reflective characteristics of snow and cloud, the weather status seriously affects snow monitoring using optical remote sensing data. Cloud amount analysis during 2010 to 2011 snow seasons shows that cloud cover is the major limitation for snow cover monitoring using MOD10A1 and MYD10A1. By use of MODIS daily snow cover products and AMSR-E snow wa- ter equivalent products （SWE）, several cloud elimination methods were integrated to produce a new daily cloud flee snow cover product, and information of snow depth from 85 climate stations in Tibetan Plateau area （TP） were used to validate the accuracy of the new composite snow cover product. The results indicate that snow classification accuracy of the new daily snow cover product reaches 91.7% when snow depth is over 3 cm. This suggests that the new daily snow cover mapping algorithm is suitable for monitoring snow cover dynamic changes in TP.     

基于Track分析日本3·11地震对周围IGS站的影响

2011年3月11日日本宫城县(38.322°N,142.369°E)发生Ms9.0级地震,利用日本本岛及周围IGS站的观测数据,采用GPS静态定位、动态差分定位两种方法进行数据处理,计算出了若干站点地震前后的位移量。地壳变形分析结果表明:地震对周围IGS站的位移有不同程度的影响,最大可达到2.46m,所有观测站都向东方向运动,并且计算得出GPS速度场;通过选择较稳定的IGS站作为参考站,计算了2个观测站的动态变形,同时得到了地震波的传播速度。     

论测量在山体滑坡监测中的应用

山体滑坡是常见的地质灾害,已经给我们的生活造成了巨大的伤害。对山体滑坡的治理、预防已成为我们必须研究的问题。测量在对山体滑坡的监测中起着不可替代的作用。     

媒体广场

正2013年的土地政策呈现出三大特点新一轮金刚石找矿瞄准五大战略选区日前,从"2013年中国土地政策蓝皮书"新闻通气会获取消息,《中国土地政策蓝皮书(2013)》近日由中国社会科学出版社出版发行。中国土地政策蓝皮书对2013年的主要土地政策进行了评价:从重审批转向重监管;从重增量转向重存量和增量并重;从重出台政策到重政策效果。(国土资源部门户网站)近日《全国金刚石找矿总体方案》通过专家论证。《方案》提出,全国新一轮金刚石找矿工作将     

简述摄影测量与遥感中的4D产品制作

简介摄影测量与遥感中的4D产品的制作方法,以及4D包括的内容。     

我国西部1:50000地图新产品设计与表达技术

西部测图工程以"丰富产品种类,拓展服务领域"为设计宗旨,力求地图新产品开发,在传统4D产品的基础上,根据西部地物地貌特征补充了地形图要素内容,开发研制了影像地图、晕渲地形图新产品。本文针对原有地形图在表达西部地物地貌特征方面的不足,介绍了西部测图工程中地图新产品的内容设计与制图表达,包括地形图要素扩充内容与制图表达、影像地图产品内容设计与制图表达、晕渲地形图产品内容设计与制图表达等技术内容。地图新产品设计与表达技术已应用在西部测图中,指导生产了我国西部首批1:50000地形图、影像地图和晕渲地形图产品,丰富了我国基本比例尺地形图产品种类。     

爱岗敬业做贡献,无私奉献添光彩

正作为一名留学生,怀着对祖国的无限眷恋,充满着对祖国美好前景的憧憬,我回到了祖国的怀抱,并且幸运地成为了环境院编图室的一员。在编图室工作的这段时间里,我从同事们的身上学到了很多东西,不仅仅是业务知识,还有一种品德,一种精神。那就是在工作中投以饱满的激情,兢兢业业做好本职工作,爱岗敬业的精神。爱岗首先要敬业。敬业作为基本的职业道德,是对每个人工作的一种普通要求,是一种对待自己职业应     

布拜图对PACMANUS热液区Si-Fe-Mn-羟基氧化物沉淀条件的指示

Utilizing Si, Fe and Mn concentrations within the end-member PACMANUS hydrothermal fluid, Si-Fe-MnH_2 O Pourbaix diagrams were constructed at 300°C and 25°C. The Pourbaix diagrams show that the main Si, Fe and Mn oxides species precipitating from the hydrothermal fluid were Si O_2, Fe(OH)_3, Fe_3(OH)_8, Mn_3O_4, and Mn_2O_3 at 25°C. During mixing of hydrothermal fluid with seawater, Si O_2 precipitated earlier than FeMn-oxyhydroxides because of the lower stability boundary. Then Fe(OH)_2 precipitated first, followed by Fe_3(OH)_8 and Fe(OH)_3, and last, small amounts of Mn_3O_4 and Mn_2O_3 precipitated. Fe(OH)_3 was readily deposited in alkaline solution with little influence by Eh. There were many Si-Fe-Mn-concentric particles in the polished sections of the massive precipitates collected from PACMANUS. In the concentric nucleus and ellipsoid, Si oxides precipitated first before the hydrothermal fluid had mixed with seawater. In the concentric nucleus, after the precipitation of Si oxides, the increase of p H and Eh promoted the precipitation of Mn oxides around the Si oxides. In the large ellipsoid, the precipitation of Fe was divided into two periods. In the early period, increase of p H value of hydrothermal fluid produced by low-temperature convection and an input of a small volume of seawater promoted a small amount of Fe(OH)_3 to precipitate in the Si-rich core. In the late period, after complete mixing with seawater and the resultant fluid was close to neutral or slightly alkaline in p H, Fe(OH)_3 was easily precipitated from the solution and distributed around the Si-rich core.     

开放街道图的志愿者地理信息空间语义交互研究

本文提出一种分析志愿者地理信息(VGI)中点要素的空间语义交互方法,将要素类型对社区约定的表达作为评估空间语义交互的主要基础,通过开放街道图(OpenStreetMap,OSM)空间语义子集中元素的历史变化介绍了一种新的语义相似性方法。研究结果为构建辅助志愿者地理信息的贡献者的系统创造了条件,这种系统可以用来推荐新的要素类型,清理已有数据并且集成异源数据。