The global rainforest mapping project JERS-1:a paradigm of international collaboration for monitoring land cover change

The Global Rainforest Mapping (GRFM) project was initiated in 1995 and, through a dedicated data acquisition policy by the National Space Development Agency of Japan (NASDA), data acquisitions could be completed within a 1.5-year period, resulting in a spatially and temporally homogeneous coverage to contain the entire Amazon Basin from the Atlantic to the Pacific; Central America up to the Yucatan Peninsular in Mexico; equatorial Africa from Madagascar and Kenya in the east to Sierra Leone in the west; and Southeast Asia, including Papua New Guinea. To some extent, GRFM project is an international endeavor led by NASDA, with the goal of producing spatially and temporally contiguous Synthetic Aperture Radar (SAR) data sets over the tropical belt on the Earth by use of the JERS-1 L-band SAR, through the generation of semi-continental, 100m resolution, image mosaics. The GRFM project relies on extensive collaboration with the National Aeronautics and Space Administration (NASA), the Joint Research Center of the European Commission (JRC) and the Japanese Ministry of International Trade and Industry (MITI) for data acquisition, processing, validation and product generation. A science program is underway in parallel with product generation. This involves the agencies mentioned above, as well as a large number of international organizations, universities and individuals to perform field activities and data analysis at different levels.     

Modeling the relationship of land use change and some geophysical indicators for the interlock area of farming and pasturing in China

This paper discusses land-use changes in the interlock area of farming and pasturing (IAFP)in northern China. It presents detailed analyses of land-use features in the IAFP, which are controlled by the macro geomorphic units and geophysical conditions-constraints or advantages. Additionally, it selects some indicators, according to the availability in acquiring and processing their quantitative data, to analyze the canonical correlations between the typical conversion of grassland and geophysical conditions. The preliminary study indicates that the physical conditions are of great advantages to the development of grassland. There exists significant correlation between land use change and some geophysical conditions.     

德令哈6．6级地震前卫星红外长波辐射OLR的分析

应用NOAA卫星资料反演的地震长波辐射值OLR对2003年4月17日发生在青海省德令哈西的6．6级地震进行了追踪研究。结果显示：2003年1月起OLR距平值出现明显的高值异常区域。     

采用交换式路由器结合代理服务器作为互联网接入方案的剖析

介绍交换式路由器结合代理服务器在实现不同网段局域网共享接入国际互联网的具体应用。     

区域化探找矿新案例-甘肃代家庄铅锌矿的发现

代家庄铅锌矿是在甘肃省用地球化学勘查方法发现的第一个大型铅锌矿床。作者回顾了发现该矿床的简史,研究了矿床地质、地球化学特征,探讨矿区进一步找矿的远景,讨论应用地球化学勘查方法寻找铅锌等有色金属矿产的经验和教训。     

莺歌海盆地断裂活动与地质灾害分析

莺歌海盆地是南海西北部海域地质灾害类型较齐全的地区之一。根据野外调查资料,本文简要地分析了该区的活动断裂和地质灾害类型。区内活动断裂主要走向呈NW向,该方向的活动断裂主要有红河断裂带、中央拗陷东部断裂带和中央拗陷西部断裂带。红河断裂带在地震资料上显示为一倾向SW的正断层,表现为明显的重力梯级带和磁异常分界带,NE向断裂带分布于盆地中部,在重磁异常上表现为明显的异常带,在北部表现为被NW向的断裂切割。莺歌海盆地地质灾害类型主要有地震活动、泥底辟构造、滑坡与崩塌等。同时,还对该区地质灾害基本特征和分布规律进行了初步分析。     

温州世贸中心大厦钻孔灌注桩施工技术

介绍了温州世贸中心大厦钻孔灌注桩的主要特点和施工难点，以及在生产施工中所采取的主要技术措施，特别针对该工程中风化残留体施工难度大、桩孔深的特点，介绍了相应的处理办法和注意事项。     

现代地籍技术(第五讲)地籍信息系统

分析了地籍信息系统的发展历程,总结了地籍信息系统的主体目标,介绍了系统的总体结构及其软硬件环境,讨论了地籍信息系统建设和管理的基本实体、时态性、标准化和信息服务,指出了地籍信息系统应解决的重点和难点问题.     

地形可视化的进展与评述

地形可视化由于具有越来越广泛的用途，因此越来越多地引起了大家的关注。本文在简要论述科学可视化、地形可视化定义及其研究内容的基础上，着重讨论了当前地形可视化的表达手段、可视化建模与技术、可视化生成工具、实时地形生成等方面的研究现状及存在的问题，最后对可视化的应用前景和发展趋势进行了展望。     

基于决策树分类的大屯矿区地物信息提取及矿区污染分析

本文在对国内外遥感图像分类方法充分研究分析的基础上,选择决策树分类法对大屯矿区的Landsat 8遥感图像进行分类研究。选取样本提取并分析研究区典型地类光谱特征曲线,依据光谱曲线特征和归一化植被指数建立了土地利用分类决策树模型,通过反复试验和修正,筛选出适宜大屯矿区地物分类的决策树最优阈值,对研究区进行分类和精度评价,最后通过分类结果对研究区的水体污染状况进行简要分析。