地理信息服务的思考与探索

地理信息系统(geographic information system,GIS)正在从传统意义上的地理信息系统向地理信息服务偏转,地理信息服务已成为信息服务业中的一个重要组成部分.文中归纳总结地理信息服务概念、技术体系、服务模式以及我国地理信息服务发展的差距、对策与建议.     

GPS/VRS虚拟观测值生成与发布研究

虚拟参考站（VRS）技术是目前GPS网络RTK系统研究领域的热点之一。介绍VRS系统的组成及原理;论述VRS虚拟观测值的生成算法及发送给用户后随机商业软件的解算模型;最后介绍算法的软件系统实现,通过与真实观测值比较的方法验证虚拟观测值的可行性和稳定性。     

旋转多基线数字近景摄影测量

提出了一种全新的数字近景摄影测量方法——旋转多基线数字近景摄影测量。该方法通过应用旋转摄影增大了摄影视场角,应用"多基线"的摄影方式增大了摄影交会角,提高了交会精度,并且解决了近景摄影测量中大交会角影像难以实现自动匹配的困难。同时,该方法将传统的区域网空中三角测量应用于近景摄影测量,用于影像外方位元素的解算,在提高精度的同时减少了外业工作量,提高了生产效率。     

全直径岩心分析Archie参数在DQ油田XX区块的非均质火成岩气层评价中的应用

指出了全直径岩心分析的Archie参数(m、n)对非均质储层含油(气)性评价的重要性.使用新疆测井公司开发的全直径岩心多参数分析实验装置及实验方法,以DQ油田XX区块的非均质火成岩气层评价为例,由7块全直径岩样该获得了储层的物性和Archie参数.当应用于该储层含气饱和度估算后,与密闭取心饱和度分析的含气饱和度结果比较,含气饱和度估算误差大致在5%以内,较按Archie参数的确省值(m=n=2)估算的含气饱和度的精度高 10%左右.考虑到非均质储层在岩性、物性、孔隙结构的特殊性,推荐“真正”使用全直径岩心分析方法应用于非均质储层的物性、含油(气)性的评价,并重视模拟油藏条件的全直径岩心分析装置的开发.     

EFFECTS OF THREE-DIMENSIONAL STRUCTURE OF HEATING FIELD ON THE SUMMER MONSOON CIRCULATION IN ASIA

In this paper,a primitive equation linear wave model is used to examine the effects of three-dimen-sional structure of heating field on the behavior of stationary planetary waves in summer and to comparethe roles of different heating functions for the formation and maintenance of summer monsoon circulationin Asia.It is shown that the aloft heating connected with the latent heating,especially the deep condensationheating associated with the cumulus convection in low latitudes,plays a crucial part in the Asian summer mon-soon and the structures of planetary wave responses are quite sensitive to the vertical distribution of heating.     

封河预报数学模型研究

分析了河冰水力学、封河机理及影响封河的因素，并根据封河机理和影响封河的因素，建立了封河预报数学模型，以黄河内蒙古河段为例，率定封河预报数学模型的函数形式进行检验，证明预报模型精度高且使用方便。     

Characteristics of melt inclusions in skarn minerals from Fe,Cu(Au) and Au(Cu) ore deposits in the region from Daye to Jiujiang

The skarns and skarn deposits are widely distributed at home and abroad. The skarn deposits include many kinds of ores and higher ore grade. Some of them are broad in scale. Scientists of ore deposits from different countries have paid and are paying grea…     

基于TM影像的南京市土地利用遥感动态监测

基于南京市1988年和1998年两期TM影像，首先用辐射水准归一化法将1998年影像校正到1988年影像的辐射水平上，再经过几何校正、训练区纯化等预处理，对两期影像分别用最大似然法进行分类，然后在Arc／Info的GRID模块中编写AML语言，对得到的两期土地利用分类图进行叠置运算，提取出土地利用动态变化信息。分析结果表明，10a间南京市耕地面积大量减少，林地面积有所增加。     

Wavelet filter analysis of splitting and coupling of seismic normal modes below 1.5 mHz with superconducting gravimeter records after the December 26, 2004 Sumatra earthquake

New generation superconducting gravimeters (SGs), which have been demonstrated to be better than the best seismometers STS-1 at frequencies below 1 mHz, can be accepted as the quietest vertical seismometers for observation of long-period earth free oscillations. Wavelet filtering with narrow band-pass frequency response as shown in this paper is very helpful in removing at- mospheric pressure effects from on gravity records in long-period seismic mode frequency bands. The processing of high quality SG records after the great Sumatra earthquake (Dec. 26, 2004) with wavelet filtering leads to clear observations of all coupled toroidal modes below 1.5 mHz except these for 0T5, 0T7 and 1T1; moreover 1T2 and 1T3 are, for the first time, unambiguously revealed in the vertical components of the free oscillations. The three well-resolved splitting singlets of overtones 2S1 are observed from a single SG record for the first time.     

GPS信号载噪比研究

介绍了GPS接收机所接收信号的栽噪比；提出了载噪比方向图的概念，导出了栽噪比方向图与天线增益方向图的关系；初步评估了大气损耗的时空差异；指出可利用栽噪比异常方向图确定被动式干扰源的方位。