2001—2018年中亚干旱区地表水资源时空变化特征

基于2001—2018年长时间序列地表水遥感监测数据,提取中亚五国地表水面积信息,通过动态度法、变化斜率法和相关分析法揭示中亚五国地表水面积的时空动态变化特征并对其进行驱动力分析。结果表明：① 中亚五国地表水呈“北密南疏”分布特征,中北部地表水变化明显。近18 a来,季节水面积呈显著增加趋势,增加了133.55%,而永久水呈波动减少趋势,减少了17.27%。哈萨克斯坦地表水面积占比最大且变化也最为明显,其次是乌兹别克斯坦,其余三国无较大变化。② 2001—2018年,中亚五国全区季节水动态度为7.42%,并呈快-慢-快的增长趋势,而永久水呈增长-下降-增长的演变趋势,乌兹别克斯坦地表水变化最为活跃;北部边缘及图尔盖洼地、西部里海沿岸和咸海地区永久水面积显著减少而季节水显著增加,永久水向季节水转换现象明显。③ 中亚五国增温趋势不明显,降水呈减少趋势,人口、GDP和耕地均呈增加趋势。中亚五国地表水面积变化主要受社会经济因子的影响,气候因子对地表水的影响不显著。     

浅析昆明国土资源“大数据”建设

本文探讨昆明市国土资源数据管理部门应如何使用大数据技术来管理、利用数据,发掘数据之中的价值,为社会服务、政府决策提供支持。同时,探索如何部署大数据技术、建立技术机制和人才保障制度。     

Semantically Enriching an Open Source Sensor Observation Service Implementation for Accessing Heterogeneous Environmental Data Sources

Many kinds of environmental data are nowadays publicly available, but spread over the web. This article discusses using the Sensor Observation Service (SOS) standard of the Open Geospatial Consortium (OGC) as a common interface for providing data from heterogeneous sources which can be integrated to a user tailored environmental information system. In order to allow for providing user‐tailored and problem‐specific information the adjusted SOS is augmented by a semantic layer which maps the environmental information to ontology concepts. The necessary information fusion from different domains and data types lead to several specific requirements for the SOS. Addressing these requirements we have implemented a SOS which still conforms to the OGC SOS 1.0.0 standard specification. The developed SOS has been integrated in a publicly available demonstrator of our personalized environmental information system. Additionally this article discusses future consequences for the SOS, caused by the recently published SOS 2.0 specification.     

长江三峡库区地震地形变监测研究

三峡地壳形变监测网络结合空间大地测量(GPS、InSAR)和传统大地测量的优点，在1998年以来的三峡工程建设期间和2003年水库首次蓄水中获取了大量监测成果。结果显示库区地壳运动的基本图像：垂直形变较为显著，主要来自因蓄水荷载而产生的形变，水平形变不明显．库区主要断层的活动性在蓄水期间有明显加强迹象。水准测量反映从1998年首期观测至2003年10月首次蓄水后的库区垂直位移．沉降范围较大；GPS给出了2003年蓄水前后库区的垂直位移，形变的范围主要集中在水库近岸区域。水准测量与GPS观测反应的垂直位移的量级基本一致，沉降的最大幅度在3～4cm左右。水准监测、GPS观测与重力监测结果有一定的对应性。从地壳形变监测与研究结果分析，近期负荷改变而诱发中强地震的可能性不大。     

桂北376铀矿床烃气地球化学研究

烃气测量法在锡、金、铜、铅锌等金属矿床找矿中得到了广泛应用,而该技术在花岗岩型铀矿找矿中的应用鲜有报道。本文对桂北376铀矿床已知矿体开展了烃气测量试验,结果显示：相较于其他金属矿,该铀矿区花岗岩和土壤中总烃含量极低,而且花岗岩总烃含量(平均19.42μL/kg)高于上覆土壤(平均6.32μL/kg)。花岗岩中U与多数烃气组分呈负相关,与重烃呈正相关,重烃在U迁移过程中作用强于轻烃;花岗岩烃气标准化配分模式以C₁、iC₄和C₂^-正异常为特征;铀矿化程度与iC₄/nC₄、(C₁+iC₄+C₂^-)/(C₂+C₃+nC₄)及C₂^-/C₃^-比值呈正相关,与C₂₊/∑C比值呈负相关等可为寻找铀矿提供依据。3...     

基于基础地理数据统计的长三角城市主城区空间格局扩展研究

在快速城镇化时期,城市主城区的空间格局变化最为显著,以其复杂性和扩展性为突出特征。研究其扩展变化对认识城镇化、优化城市空间结构等具有重要意义。本文在基础地理数据统计的基础上,对长三角城市主城区2002~2012年的空间扩展进行了分析,探索影响其演变的若干因素。     

The abundance and radial distribution of satellite galaxies

Using detailed mock galaxy redshift surveys (MGRSs) we investigate the abundance and radial distribution of satellite galaxies. The mock surveys are constructed using large numerical simulations and the conditional luminosity function (CLF), and are compared against data from the Two Degree Field Galaxy Redshift Survey (2dFGRS). We use Monte Carlo Markov chains to explore the full posterior distribution of the CLF parameter space, and show that the average relation between light and mass is tightly constrained and in excellent agreement with our previous models and with that of Vale & Ostriker. The radial number density distribution of satellite galaxies in the 2dFGRS reveals a pronounced absence of satellites at small projected separations from their host galaxies. This is (at least partly) owing to the overlap and merging of galaxy images in the 2dFGRS parent catalogue. Owing to the resulting close-pair incompleteness we are unfortunately unable to put meaningful constraints on the radial distribution of satellite galaxies; the data are consistent with a radial number density distribution that follows that of the dark matter particles, but we cannot rule out alternatives with a constant number density core. Marginalizing over the full CLF parameter space, we show that in a ΛCDM concordance cosmology the observed abundances of host and satellite galaxies in the 2dFGRS indicate a power spectrum normalization of  σ₈≃ 0.7  . The same cosmology but with  σ₈= 0.9  is unable to match simultaneously the abundances of host and satellite galaxies. This confirms our previous conclusions based on the pairwise peculiar velocity dispersions and the group multiplicity function.