利用Lunar Prospector Doppler数据解算并分析月球重力场

Doppler技术可高精度测定卫星之间的距离变化率,可以和其他技术联合用于月球卫星定轨。本文利用Lunar Prospector月球项目4个月的Doppler跟踪数据,解算了75阶次月球重力场模型。首先介绍了数据预处理方法、力模型的使用及参数设置等关键技术,然后把解算的重力场模型与同阶次的其他月球重力场模型进行比较,可以看出低阶位系数较LP75G月球重力场模型稍差,但高阶位系数精度有所提高,可能是仅利用了低轨单星数据的原因。     

基于3S 技术的土地执法共同责任考核模型设计及系统实现--以深圳市为例

基于3S技术和土地执法共同责任考核制度,设计满足共同责任考核计算规则的考核模型;结合深圳市规划土地数字监察平台,基于空间分析技术,建立土地执法共同责任考核系统,为实现全过程量化指标的土地执法共同责任考核模式提供更为准确、客观的参考依据及技术支撑。     

利用阴影指数和方位搜索法检测Landsat 8 OLI影像中云影

Landsat 8 OLI影像已成为重要的数据源,但受云及云影的影响较大,降低了数据的可用性,因此,快速识别云及云影,为后续的数据恢复有着积极的应用价值。通过构建云指数(CI)、归一化暗像元指数(NDPI)和比值阴影指数(RSI),采用阈值法和方位角搜索法,以两景Landsat 8 OLI影像(一景试验影像,另一景验证影像)为例进行云及云影检测。每类随机选取200个样点进行精度分析,结果表明:CI可快速区分OLI影像中的云区与非云区,厚云样本点正确识别率达到99%;NDPI与归一化植被指数(NDVI)构建的比值阴影指数RSI放大了水体、云影与其他阴影间的差异,更便于区分;方位搜索合理设置搜索方位角和搜索距离,简化了云影与云的相对关系模型,可准确区分水体与云影,两者的正确识别率都超过93%,弥补了阈值法的局限性。本方法可行快捷,为OLI影像的后续应用提供了基础,可有效提高其利用精度。     

On the Late Hydrothermal Tungsten Deposits of Haiyangshan Mountain, Kuangsi

INTRODUCTIONThe Haiyangshan Mountain trending in the NNE-SSW direction is situated between the Hsiangan and Kuanyang cites in NE Kuangsi. The principal mines are located on the E slope at about 200 m above Sanyutsun, a village nearly 25 km NW of Kuanyang. The tungsten mineralization in the region is confined chiefly to the quartz veins which were formed by the ore-bearing solutions along the fractures in the granodiorite shortly after its consolidation.     

JADE,ITS HISTORICAL VALUE TO CHINESE PEOPLE AND ITS NOMENCLATURE

WHAT IS YU The name Yü(jade)as used by Chinese denotes Nephrite,a speciesof the amphibole group.What I am going to discuss in the present paperis not the mineralogical character of the subject,but its relation with the     

ON THE DISCOVERY OF THE GRAPTOLITE-SHALE FROM LIENTAN,YüNAN DISTRICT IN KWANGTUNG PROVINCE AND ITS STRATIGRAPHIC CORRELATION

During the years of 1869-1870 von Richthofen~1 first studied the geologyof Kwangtung province.His journey was,however,only confined to atraverse route along the North River from Sanshui,Chüchiang to Hunan province.The geology of the West River districts w     

GEOLOGY OF TANG SHAN & ITS VICINITY, NANKING

WITH 4 PLATES AND 4 FIGURES Tang Shan, or as it is sometimes called Nan Tan Shah, is situated abou 60 li W. of Nanking. On the N. E. slope of the mountain is located the town Tan Shui Chen, in which a great number of hot springs are found. An automobile road connecting Tan Shan with Nanking has been recently built and it takes     

On Minor Structures

正 With 3 Plates. PREFACE From field experience and data accumulated in recent years several short papers on field geology have been written. The present paper embodies only part of the subject-matter, and is meant for open discussion. It will be noticed that every subheading is treated on its own ac     

The Structure of the Kuenlunkuan Granodiorite and its Relation to the Formation of the Ore-bearing Quartz Veins

正 The Kuenlunknan Granodiorite, whick occurs slightly to the west of the apex of the Kuangi are, is exposed at the southern end of the Tamingshan anticline. The mass is injeated into the Lower Devonian and Pre-Devonian rocks. This pluton is     

An Additional Note on Stratigraphical Unconformities in Kuangsi

正 This brief note is meant to serve as an addendum to a previous paper.' Basing upon stratigraphical data recently collected in Kuangsi, three orogenic epochs which were formerly unknown in this province are definitely established.