PMODTRAN: a parallel implementation based on MODTRAN for massive remote sensing data processing     

Fang Huang  Ji Zhou  Xicheng Tan  Shunlin Liang  Jie Cheng 《International Journal of Digital Earth》2016,9(9):819-834

MODerate resolution atmospheric TRANsmission (MODTRAN) is a commercial remote sensing (RS) software package that has been widely used to simulate radiative transfer of electromagnetic radiation through the Earth's atmosphere and the radiation observed by a remote sensor. However, when very large RS datasets must be processed in simulation applications at a global scale, it is extremely time-consuming to operate MODTRAN on a modern workstation. Under this circumstance, the use of parallel cluster computing to speed up the process becomes vital to this time-consuming task. This paper presents PMODTRAN, an implementation of a parallel task-scheduling algorithm based on MODTRAN. PMODTRAN was able to reduce the processing time of the test cases used here from over 4.4 months on a workstation to less than a week on a local computer cluster. In addition, PMODTRAN can distribute tasks with different levels of granularity and has some extra features, such as dynamic load balancing and parameter checking.  相似文献   

Integrating ASTER and GLASS broadband emissivity products using a multi-resolution Kalman filter     

Linpeng Shi  Shunlin Liang  Quan Zhang 《International Journal of Digital Earth》2016,9(11):1098-1116

In this study, the multi-resolution Kalman filter (MKF) algorithm, which can handle multi-resolution problems with high computational efficiency, was used to blend two emissivity products: the Global LAnd Surface Satellite (GLASS) (BBE) product and the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) narrowband emissivity (NBE) product. The ASTER NBE product was first converted into a BBE product. A new detrending method was used to transfer the BBEs into a process suitable for the MKF. The new detrending method was superior to the two existing methods. Finally, both the de-trended GLASS and ASTER BBE products were incorporated into the MKF framework to obtain the optimal estimation at each scale. Field measurements collected in North America were used to validate the integrated BBEs. Visually, the fusion map showed good continuity, with the exception of the border areas, and the quality of the fusion map was better than that of the original maps. The validation results indicate that the MKF improved the BBE product accuracy at the coarse scale. In addition, the MKF was capable of recovering missing pixels at a finer scale.  相似文献   

Joint shape and color descriptors for 3D urban model retrieval     

Liang Zhang  Xiaojing Yao  P. Takis Mathiopoulos  Chunming Han 《International Journal of Digital Earth》2016,9(11):1117-1134

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Global warming-related tree growth decline and mortality on the north-eastern Tibetan plateau   总被引：1，自引：0，他引：1  

Eryuan Liang  Christoph Leuschner  Choimaa Dulamsuren  Bettina Wagner  Markus Hauck 《Climatic change》2016,134(1-2):163-176

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吉林百草沟金矿闪长玢岩锆石U-Pb年代学、地球化学及其地质意义     

李睿华  孙丰月  刘金龙  李良  赵拓飞  闫佳铭 《矿床地质》2016,35(5):1023-1034

文章对延边地区百草沟金矿床与成矿有关的闪长玢岩脉进行了锆石LA_ICP_MS U_Pb年代学和地球化学研究。闪长玢岩中的锆石U_Pb定年结果显示,闪长玢岩形成时代为早白垩世((128±3)Ma,MSWD=0.29)。岩石元素地球化学研究表明岩石属于高钾钙碱性系列,明显富集大离子亲石元素(如K、Ba、Rb)、LREE和强不相容元素(如Th、U),相对亏损高场强元素(如Ta、Nb、Ti、P),Mg#值为42~54,其地球化学特征与活动大陆边缘背景下形成的火成岩相似。岩石中w(Cr)为20.0×10-6~33.4×10-6,Nb/Ta比值为9.7~16.5,La/Nb比值为2.54~3.67,Th/La比值为0.19~0.43,Rb/Sr值比为0.10~0.33,闪长玢岩岩浆是由地壳物质和地幔物质混合形成的。结合野外地质特征及年代学,认为与矿床近同时形成的闪长玢岩,其形成的构造背景应为古太平洋板块斜向亚洲大陆俯冲的活动大陆边缘。  相似文献   

无内标-多外标校正激光剥蚀等离子体质谱法测定磁铁矿微量元素组成   总被引：4，自引：2，他引：2  

孟郁苗  黄小文  高剑峰  戴智慧  漆亮 《岩矿测试》2016,35(6):585-594

激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)常用于磁铁矿原位微量元素分析,按照校正策略不同,主要分为内标法和无内标法。内标法需要用电子探针(EMPA)预先测定磁铁矿中内标元素Fe的含量,过程较繁琐,且待测元素含量会受到内标元素含量测定的影响。本文采用铁含量较高的玄武质玻璃BCR-2G、BIR-1G、BHVO-2G和GSE-1G作为外标,避免了内标元素含量的测定,建立了无内标-多外标校正LA-ICP-MS测定磁铁矿微量元素组成的分析方法。利用该方法测定了科马提岩玻璃GOR-128g和自然岩浆磁铁矿BC 28的微量元素组成以评估方法的可靠性。结果表明,科马提岩玻璃的测定结果与推荐值及前人内标法的测定值一致,多数元素的相对标准偏差RSD5%;自然岩浆磁铁矿的测定结果与推荐值相比,多数元素的RSD7%,低于前人内标法的RSD(15%)。由此说明无内标-多外标法可以实现富铁硅酸岩或磁铁矿微量元素含量的准确校正,克服了基体效应的影响。因此,无内标-多外标法是一种原位测定磁铁矿微量元素含量的快速、准确方法,具有一定的应用潜力。  相似文献   

博格达山东段苏吉山辉长岩LA-ICP-MS锆石U-Pb年龄、地质地球化学特征及构造意义   总被引：2，自引：0，他引：2  

雷万杉  许鹏  郭俊锋  肖良  李相传  李勇 《地质论评》2016,62(2):317-330

苏吉山辉长岩体位于博格达碰撞造山带东段,卡拉麦里蛇绿混杂岩带西南侧,出露面积约1.8 km~2,岩性为石英角闪辉长岩。苏吉山辉长岩体富含普通角闪石(20%)和磁铁矿物,表明原生岩浆富水、高氧逸度特征,岩石化学组成属于拉斑玄武岩系列,岩石弱富集大离子亲石元素Cs、Rb、Ba、Th、U,显著亏损Nb、Ta、Zr、Hf和弱亏损Ti,显示源区为受俯冲流体交代改造的岩石圈地幔,应是洋壳俯冲的产物。苏吉山辉长岩体锆石U-Pb年龄为308.1±3.3Ma,早于卡拉麦里混杂岩带内碱性花岗岩侵位,介于博格达裂谷活动期,是裂谷作用由全面伸展向局限伸展转换的标志。苏吉山辉长岩空间上位于古亚洲洋板块沿卡拉麦里蛇绿混杂岩带向准噶尔板块斜向俯冲的前进方向,时间上介于博格达裂谷活动期,地球化学上显示洋壳俯冲的特征,各种事实表明,古亚洲洋沿卡拉麦里碰撞带向准噶尔板块斜向俯冲作用形成撕裂型博格达裂谷,博格达裂谷由伸展机制向伸展-碰撞过渡机制的应力调整导致了苏吉山辉长岩体的侵位。  相似文献   

豫西洛宁县铁炉坪Ag多金属矿床的CSAMT剖面及找矿意义     

梁涛 《地质与勘探》2016,52(2):239-245

为获得新的深部找矿靶区,在铁炉坪Ag多金属矿床实施了CSAMT法测深。CSAMT剖面中,高、中、低电阻率异常体边界清晰、形态各异,高阻异常体具有上、下双层结构,低阻异常体出露较小,多呈孤立形态产出,主要有400m低阻异常体和1400m低阻异常体。高阻异常体被解释为浅部和深部两层岩浆和深部流体活动的产物,推测深部高阻异常体以岩浆体系为主,浅部高阻异常体应是岩浆体系、深部流体体系及围岩硅化蚀变等的综合反映。400m低阻异常体对应于于地表剖面线400m~600m之间的主矿脉,表明它是深部成矿流体的显示,提出1400m低阻异常体为新的深部找矿靶区。  相似文献   

近年我国十大重要金属矿种找矿重大进展与成果   总被引：1，自引：0，他引：1  

陕亮  张万益  姚晓峰  马腾  刘江涛  贾德龙  王尧  张鑫刚 《地质论评》2016,62(S1):151-153

近年我国重要矿产资源勘查成果不断快速涌现。为服务矿产勘查进展长期动态跟踪与成果集成研究,2010~2014年,笔者依托原中国地质调查局发展研究中心承担的《重点成矿区带矿产勘查跟踪与成果集成》、《全国地质勘查进展分析》等项目,以铁、铜、铝、铅锌、金、钨、锡、钼、镍、锰等十大重要金属矿产勘查进展为主要研究对象,研究分析了勘查成果特征。  相似文献   

Experimental Study of Coal and Gas Outbursts Related to Gas-Enriched Areas     

Qingyi Tu  Yuanping Cheng  Pinkun Guo  Jingyu Jiang  Liang Wang  Rong Zhang 《Rock Mechanics and Rock Engineering》2016,49(9):3769-3781

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