云母分子式计算方案的选择     

孙世华 《岩石学报》1987,3(4)

本文借助主成分分析证明了花岗岩类中黑云母的Fe~(3+)、Fe~(2+)和(OH+F)主要的数量关系不表现为氧羟铁云母置换,还讨论了水不足和水过剩对云母分子式计算结果的影响,进而提出了当处理一批未受明显脱羟基氧化的云母,尤其是当其中包括明显水过剩云母时,宜优先采用O=22计算分子式方案等建议。  相似文献   

高阜工业园区土地平整土方量计算     

秦卫祥  谢旭晖 《北京测绘》2007,(4):54-55,53

土方量的计算方法有方格网法、断面法、等高线法及基于DEM的计算方法等。为了计算高阜工业园区的土方量,本文采用了方格网法;并重点讨论了在不同坡度下,得到的不同土方量计算结果;最后根据测区需要,做出合理选择。  相似文献   

An Overview of Measurement and Calculation Methods on the Land Surface Temperature on Alpine Mountainous Cold Regions     

Yang Yong  Chen Rensheng  Song Yaoxuan 《地球科学进展》2014,29(12):1383-1393

Land surface temperature on alpine mountainous cold regions, which is one of basic parameters of the regional hydrological and meteorological conditions, directly affects glacial recession, snow melt, distribution and freezing thawing process of permafrost, evapotranspiration, vegetation growth, and various underlying surface change process, and then changes the regional hydrological and ecological environment, becomes the important parameter of the research on land surface process and the study of eco-hydrological process. This paper tried to provide an overview of research on land surface temperature, and to introduce its influence factors and the ways to obtain land surface temperature data in high mountainous cold region. Relative to low elevation plain, the land surface temperature was significantly affected by local altitude, terrain and plant cover. There were some methods to obtain land surface temperature, such as measurement in situ, retrieval based on remote sensing and calculation by land surface process models, but there were some limitations while used on alpine mountainous cold regions. Land surface temperature data from meteorological stations were only about level bare ground, and the influence of terrain or vegetable cover was not considered. Therefore, the data could not represent the information of region scale on mountainous area. Land surface temperature retrieval from remote sensing data, because of calculation theory, ground observation verification and spatiotemporal resolution, made it difficult to fulfill research on hydrology, land surface process and eco-hydrological process in alpine mountainous area. Land surface process models estimated land surface temperature in the experimental sites with high accuracy, but reduced the accuracy while upscale to the region scale on the mountainous cold area, because of the error from input control meteorological, soil and plant variables, and the error of ground observation site verification. The future research on land surface temperature on alpine mountainous cold regions should strengthen field observations and improve data accuracy, to build a physical land surface temperature estimation method with topographic and vegetation parameters, and to contribute to research on land-atmosphere-water process in alpine mountainous regions.  相似文献   

CR、PS干涉测量联合解算算法研究   总被引：1，自引：0，他引：1  

程滔  单新建 《地震》2007,27(2):64-71

由于时间去相干、 空间去相干和大气扰动等因素的影响, 传统InSAR技术在形变监测中存在着很大的局限性, 而当今新兴发展起来的CRInSAR、 PSInSAR技术则不受这些因素的限制, 从而大大提高了InSAR技术在形变监测尤其是在微量形变监测中的精度。 该文首先分析了传统InSAR技术所存在的局限性; 引入了CR、 PS高相干性散射体基本概念, 并介绍CRInSAR、 PSInSAR技术在当前国际上的研究进展情况; 通过PSInSAR算法的应用研究, 得出将CR与PS进行联合解算的必要性与优势, 并提出高相干性散射体联合解算算法。  相似文献   

不规则三角网法在土方量计算工程的应用   总被引：1，自引：0，他引：1  

王少云 《北京测绘》2009,(2):51-53

选用合适的土方量计算方法会影响计算结果的精度,准确地计算土方量会减少工程投资与预算的偏差。介绍了不规则三角网法在土方量现实工程中的应用,利用此法在现实工程中应注意的问题,提出了解决问题的办法。  相似文献