从城市地区的DSM到DTM     

仇彤  张祖勋  张剑清 《武汉大学学报(信息科学版)》1997,(3)

讨论了根据影像匹配的结果将ＤＳＭ修正成ＤＴＭ的方法。本文针对城市地区航空影像的立体匹配结果，结合影像的结构纹理特征，提出了一种自动修正影像匹配结果以获得正确的ＤＴＭ的方法。  相似文献   

多宝山超大型铜矿床的成矿构造环境   总被引：9，自引：0，他引：9  

尹冰川  冉清昌 《矿物学报》1997,17(2):220-224

多宝山超大型铜矿床是我国典型的斑岩型矿床，主要产出于多宝山组岛弧建造和花岗闪长岩、花岗闪长斑岩中，成矿年龄为292～283Ma。根据地球物理异常及大量的基性和超基性岩体，以及通过对比两侧的岩石圈结构、古生物、结晶基底、成矿特征和地球化学特征，认为黑河一嫩江是一条重要的构造边界带，它是兴安和松嫩地块在早石炭世拼合、碰撞、造山隆起形成的。多宝山超大型铜矿床就是形成于两板块碰撞后隆起抬升构造环境的斑岩型铜矿床。  相似文献   

埋藏条件下碳酸盐岩实验室溶蚀作用模拟的热力学模型与地质勘探方向——以陕甘宁盆地下奥陶统马家沟组第五段为例   总被引：1，自引：0，他引：1  

肖林萍 《沉积与特提斯地质》1997,(4)

陕甘宁盆地下奥陶统马家沟组五段为潮坪相碳酸盐岩夹蒸发盐沉积。马五段经历了多期复杂的成岩作用，其中溶蚀作用对马五段影响深刻。首次引用热力学理论对埋藏条件下碳酸盐岩溶蚀作用进行了理论分析和计算。其结果表明碳酸盐岩在埋藏成岩的不同温度压力条件下，酸性介质中溶解反应的吉布斯自由能均为负值，说明反应可自动向方解石、白云石溶解的方向进行，并随着温压的升高溶解的趋势增大，而且白云石溶解的趋势比方解石更大。碳酸盐岩溶蚀作用是受热力学规律支配的自然地质作用。碳酸盐岩溶蚀实验模拟的热力学数学模型对陕甘宁盆地油气田勘探具有重大的理论意义和实际应用价值。  相似文献   

Amelioration of soil fertility by woody perennials in cropping fields: evaluation of three tree species in the semi-arid zone of Nigeria     

I. A. Jaiyeoba 《Journal of Arid Environments》1996,33(4):473-482

Soil was sampled from cropping fields in radial patterns from beneathAcacia albida, Parkia bigloboza(Jacq.) Benth. andEucalyptus camaldulensisDehnh. near Zaria, Nigeria. Results of analysis show a significant coarsening of soil texture and a decrease in organic matter and cation exchange capacity with increasing distance from all three tree species at a depth of 0–15 cm. Concentrations of nitrogen and some exchangeable cations decreased significantly with increasing distance from beneath acacia and parkia, and soil pH decreased with increasing distance from eucalyptus. The implication of the results for land management are discussed in relation to increasing productivity and soil use sustainability.  相似文献   

矿物英文名称的含意解析     

沈守文 《矿物学报》1996,16(1):92-96

许多矿物中文名称与英文名称的含意不一致，为了正确理解矿物的英文名称，本文介绍了３１０个常见矿物和重要矿物的英文名称的含意。  相似文献   

酸性污染物欧拉型输送转化模式的研究   总被引：2，自引：0，他引：2  

高会旺  黄美元 《地球科学进展》1997,12(5):422-427

数值模式是研究酸性污染及其长距离输送特性的一种重要方法。７０年代以来，国内外发展了许多欧拉型的输送转化模式，我国在欧拉型酸性污染物长距离输送模式的研究中也取得了重要进展。主要介绍了国内外的欧拉酸性污染物输送转化模式，并就模式的发展方向进行了讨论。  相似文献   

辽西义县组奔龙类化石一新种   总被引：4，自引：1，他引：4  

刘金远  姬书安唐烽　高春玲 《地质通报》2004,23(8):778-783

在辽宁西部义县头台的义县组中新发现的1件奔龙类化石标本，显示出许多中国鸟龙属(Sinornithosaurus)所具有的特征，如上颌骨眶前窝侧面具有装饰性凹坑、前颌骨齿无边缘小锯齿、齿骨后缘二分叉、指节Ⅲ-1略长于指节Ⅲ-2的2倍、踱骨Ⅲ部分窄踱型形态等。但其头骨的部分骨骼与千禧中国鸟龙(S．millenii)有明显的区别：前颌骨主体部分相对较高，其长仅稍大于其高，前颌骨角大，前颌骨上颌突与鼻突均很长，上颌骨不参与外鼻孔的构成，上颌骨窗相对较小且为圆形，方颧骨上升突明显长于颧骨突，齿骨长高之比小等。此外，新标本肠骨的耻骨柄前后方向的宽度小于髋臼宽度。这些不同之处表明，义县头台的标本应为中国鸟龙属另一新种，将其命名为郝氏中国鸟龙(新种)(S．haoiana sp．nov.)。  相似文献   

Accuracy analysis, dem generation and validation using russian tk-350 stereo-images     

Gürcan Büyüksalih  Güven Koçak  Murat Oruç  Hakan Akçin  Karsten Jacobsen 《The Photogrammetric Record》2004,19(107):200-218

TK-350 stereo-scenes of the Zonguldak testfield in the north-west of Turkey have been analysed. The imagery had a base-to-height ratio of 0·52 and covered an area of 200 km × 300 km, with each pixel representing 10 m on the ground. Control points digitised from 1:25 000 scale topographic maps were used in the test. A bundle orientation was executed using the University of Hanover program BLUH and PCI Geomatica OrthoEngine AE software packages. Tests revealed that TK-350 stereo-images can yield 3D geopositioning to an accuracy of about 10 m in planimetry and 17 m in height. A 40 m resolution digital elevation model (DEM) was generated by the PCI system and compared against a reference DEM, which was derived from digitised contour lines provided by 1:25 000 scale topographic maps. This comparison showed that accuracy depends mainly on the surface structure and the slope of the local terrain. Root mean square errors in height were found to be about 27 and 39 m outside and inside forested areas, respectively. The matched DEM demonstrated a systematic shift against the reference DEM visible as an asymmetric shift in the frequency distribution. This is perhaps caused by the presence of vegetation and buildings.  相似文献   

Integration, validation and point spacing optimisation of digital elevation models   总被引：1，自引：0，他引：1  

Simon J. Buckley  Harvey L. Mitchell 《The Photogrammetric Record》2004,19(108):277-295

  相似文献   

A Model-Based Approach to Semi-Automated Reconstruction of Buildings from Aerial Images     

Kourosh Khoshelham  Zhilin Li 《The Photogrammetric Record》2004,19(108):342-359

Automated reconstruction of building objects from aerial images is a complex problem due to the diversity of buildings as well as noise and low contrast of images, which are the results of distant photography, atmospheric effects and poor illumination. In this paper, a semi-automated approach to the reconstruction of parametric building models from aerial images is presented, which works with line segments extracted from the image. The model is selected interactively from a library of parametric models. A perceptual grouping technique is used to select the most significant image lines in terms of relations such as proximity and parallelism. Model lines are searched for the same relations as in the grouped image lines, and the corresponding lines undergo a matching procedure, which determines whether or not a match can be found between the given model and image lines. An experiment with aerial images of flat-roof and gable-roof buildings is shown and its results indicate the robustness and efficiency of the proposed approach.  相似文献