μ������ֽ�ؿ�ˮƽ�˶���Ӧ������   总被引：3，自引：2，他引：1  

瞿伟  张勤  王庆良  凌晴 《大地测量与地球动力学》2009,29(4):34-37

????2001??2004??GPS?????????о?μ??????????????????????????????????????????????????????????????????1)????????????????????, ?о????????????????????????????????,????μ??????в????????????????????????GPS????????????????2)???е???????-????-????-??????????????????????????,???????????????,????????????-????-????-μ???????С??????????????  相似文献   

土壤有机质光谱特征研究(英文)   总被引：1，自引：0，他引：1  

何挺  王静  林宗坚  程烨 《地球空间信息科学学报》2009,12(1):33-40

The study on soil spectral reflectance features is the physical basis for soil remote sensing. Soil organic matter content influences the soil spectral reflectance dramatically. This paper studied the spectral curves between 400 nm∼2500 nm of 174 soil samples which were collected in Hengshan county and Yixing county. Fourteen types of transformations were applied to the soil reflectance R to remove the noise and to linearize the correlation between reflectance (independent variable) and soil organic matter (SOM) content (dependent variable). Then, the methods such as derivative spectrum technology and stepwise regression analysis, were applied to study the relationship between these soil spectral features and soil organic matter content. It shows that order 1 derivative of the logarithm of reflectance (O1DLA) is the most sensitive to SOM among the various transform types of reflectance in consideration. The regression model whose coefficient of determination reaches 0.885 is built. It predicted the soil organic matter content with higher effect. Supported by the National Natural Science Foundation of China (No. 40271007).  相似文献   

Sedimentary Features and Sea-Level Changes Reflected in Drill Holes in the Zhuhai Area     

CHEN Junren  WAN Ling Guangzhou Marine Geological Survey  MGMR  P. O. Box  Guangzhou 《《地质学报》英文版》1999,73(2):216-224

Experimental examinations and analyses have been made of the sediments from drill holes in the Zhuhai area, Guangdong Province. The studies show that there occurred four transgressions in this area over the historical times. The first transgression occurred at 7500 a B.P., with the maxium sea level up to about 1 m above the present level. The second transgression occurred at 5750 a B.P., with the sea level possibly 4 m higher than the present. The third and fourth transgressions took place at 4650 a B.P. and 2600 a B.P. respectively, which lasted for a long time with multiple fluctuations. The fifth transgression is in process. It could be predicted that the sea level at Zhuhai would rise by 15-20 cm in the coming 50 years.  相似文献   

四川石棉西部碳酸盐岩中金矿床的地质特征和控矿规律   总被引：2，自引：0，他引：2       下载免费PDF全文

王小春 《地质找矿论丛》1999,14(2):63-68

四川石棉西部碳酸盐岩中的金矿床产于泥盆系中统,受层间蚀变破碎带控制。围岩蚀变类型有硅化、碳酸盐化和绢云母化。矿石矿物组分为黄铁矿、黝铜矿、黄铜矿、方铅矿、闪锌矿和Ａｕ－Ａｇ系列矿物,具Ａｕ－Ｃｕ－Ａｇ－Ｐｂ－ＳＡｓ－Ｓｂ－Ｂｉ的元素组合,并一定的垂直分带规律。其成因类型为地下热卤水型。矿床受地层、岩性和断裂的控制明显。并阐明了金矿床的成矿过程和勘查准则。  相似文献   

三维地震相干应用研究新场、东泰及合兴场实例分析     

杨振武 《物探化探计算技术》1999,21(4)

本文研究了新场、东泰及合兴场三维地震相干及应用后认为：①断层、地层特征的不连续性通过三维地震相干数据体的低相干异常,能够获得十分清晰、直观的展示;②地层特征的连续性通过三维地震相干数据体的高相干异常能够得到非常清楚、明显的表现  相似文献   

都昌县程浪坂韧性剪切带基本特征及形成时代初探   总被引：1，自引：0，他引：1  

聂剑华  刘国民 《江西地质》1999,13(1):29-32

在徐家埠幅１：５万区调工作中,对前人定名的发育于都昌县大港－蜈蚣岭－程浪－乌石尖－怪山－白果树－左里－带的“蛇绿岩剪切带”进行了认真研究,认为是形成于晋宁期的韧性剪切带,定名为程浪坂韧性剪切带。本文对该韧怀切带的基本特征进行了较详细的论述,对生剪切带的形成朝代进行了初步探讨 。  相似文献   

大兴安岭地区初夏降水量的短期气候变化     

赵玲  李树岭 《黑龙江气象》1999,(4)

分析了大兴安岭地区６月降水量的基本气候特点,环流特征,短期气候变化的周期性和阶段性以脑和水与温度的反相关关系,得出对６月降水预报有意义的结论,可在今后的预报业务中应用。  相似文献   

点状要素群的结构化及其在综合中的应用     

郭庆胜 《测绘学院学报》1999,(3)

点状要素群是地图综合过程中必须处理的信息,文中分析了已有的点状要素群的分类方法,结合地图综合的特点,提出了一种改进的考虑点状要素群同其它要素关系的分类方法,通过建立点状要素群外轮廓线的方法结构化点状要素群,并用于点状要素的选取。  相似文献   

藏北高原土壤的温湿特征   总被引：15，自引：1，他引：14  

杨梅学  姚檀栋  王绍令  丁永建  陈贤章  沈永平  Toshio KOIKE 《地理研究》1999,18(3):312-317

通过藏北高原两个站点(D110和安多)土壤温湿特性的分析,表明浅层土壤温度的变化幅度明显的比深层的要大,而且浅层土壤温度受地表随机天气过程的影响较大。浅层(20cm)土壤在未冻结前湿度的变化幅度不但受形成降水的地表随机天气过程的影响,而且受其下层土壤湿度状况的影响。下层土壤湿度越小,浅层(20cm)土壤湿度的变化幅度越大。土壤湿度和土壤温度之间存在着明显的相互关系,土壤的湿度状况能够影响土壤温度变化的幅度和土壤温度变化的趋势。  相似文献   

Zonal distribution features of high frequency planetary waves in the oceans derived from satellite altimeter data   总被引：2，自引：1，他引：1  

QIAO Fangli  TAL Ezer  YUAN Yeli 《海洋学报(英文版)》2004,23(1):91-96

1IntroductionTheavailabilityofnearly9aofhighqual-itysealevelanomaly(SLA)datafromsatellitealtimetersmakesitnowpossibletoestimatethedominantsignalsofvariabilityintheglobalo-ceanmoreaccuratelythanwaspreviouslypos-sible.Moreover,mergingtheT/PandERS-1and2altimeterdatathroughanadvancedglobalobjectiveanalysiscangreatlyimproveoura-bilitytoaccuratelyestimateoceanicvariabili-tycomparedwithusingasinglealtimeter(BoulagerandMenkes,1995).ThealtimeterdatarevealthedominantroleofplanetaryRoss-bywavesinocea…  相似文献