基于GPS测量数据的GIS数据库更新算法研究

为了解决土地利用GIS数据库更新中多源数据存在不一致的问题,使土地利用GIS数据库的更新更高效、科学、合理并且美观,从地理信息系统空间数据的更新方式和土地利用数据更新的实际需求出发,以GPS测量数据为更新源,建立GPS测量数据的误差模型,借助地图匹配的算法思想,提出一种GPS/GIS数据融合匹配的方法,在GPS点误差范围内建立误差缓冲区,按照距离最近、走向最接近的原则,把GPS点与GIS数据进行融合匹配,参与GIS数据的拓扑重构,达到GIS数据库的局部区域的快速更新。实验结果证明,本算法能使GPS点匹配简便快捷,提升更新效率。     

测图精灵在地形图测绘中的应用

在介绍测图精灵功能和特点的基础上,结合实际测图经验,总结了利用测图精灵测绘地形图的方法步骤,并对测图过程中经常出现的问题提出了解决办法.     

哈尔滨市用地查询分析系统的设计与实现

随着3S技术的不断发展,客户要求的不断提高,原始的服务方式已经不能满足客户对多元信息获取的需要,在这样的背景之下,哈尔滨市用地查询分析系统应运而生,它的成功研制有效解决了客户需求,并对其他项目数据整合的方式与方法提供了有益的解决方案。     

基于IRS-P5卫星立体影像的地形图测绘试验

简要介绍了印度 IRS-P5卫星立体影像的特点及其应用前景,重点介绍了使用某地区的立体像对数据进行的1:10000地形图测绘有关试验研究。结果表明,在高精度的地面控制点的支持下,地形类别为山地的地形图平面和高程精度均可满足国家1:10000基本比例尺地形图测图规范要求。     

准噶尔盆地中部III 区块原油中25-降藿烷分布特征与成因意义

通过对准噶尔盆地中部Ш区块原油或油砂抽提物的饱和烃气相色谱-质谱分析,研究了原油或油砂抽提物中25-降藿烷的分布规律.结果表明,不同井区或同一口井不同深度(层位)的原油25-降藿烷的相对含量存在比较明显的差别,表明其所遭受的生物降解程度有所差异,沿构造带从南到北,同一油层中原油的生物降解程度增强,比如位于构造北部(构造部位相对较高)的永1井、永3井侏罗系原油25-降藿烷丰度较高,表明生物降解比较明显,而位于南部(构造低部位)的永6井白垩系和侏罗系油层中的原油均无明显的生物降解现象;同一口井随深度增大生物降解作用将弱,如永2井浅部白垩系油层的原油降解较严重,而深部西山窑组的原油降解作用则不明显.根据原油生物降解的特征,结合车-莫古隆起调整对研究区油气成藏的影响,讨论了原油生物降解差异分布的成因机制.     

Climate changing characteristics of Zhangye City in Heihe River basin during 1968–2005

At present, researches on climate change of the Heihe River basin mainly focus on the relationship between basin climate change and regional water resources, regional desertification and dynamic climatic seasons of sandstorm, but less on climate change of oasis region, where there are more intense and frequent human activities. Based on data of precipitation, temperature, strong wind and dust events frequencies obtained from the six meteorological stations of Zhangye region in Heihe River basin, the features of climate change during 1968–2005 were carefully studied. Results show that the regional temperature rise rate exceeded the average level of China. The annual precipitation changed a little, but the precipitation had a slowly increasing trend in spring and winter. Frequencies of strong wind and sandstorm days show obviously descending trends, which had a close correlation with the regional temperature rise and the precipitation increase in spring and winter. Meanwhile, further human economic activities and exploitations to the oasis in the inland valley of arid regions also affected the climate change of this region, which has a sensitive and fragile eco-environment. __________ Translated from Journal of Desert Research, 2007, 27(6): 1048–1054 [译自: 中国沙漠]