不同集合的球面矢量Voronoi图生成算法     

童晓冲  贲进  张永生 《测绘学报》2006,35(1):83-89

分析现有球面VORONOI图生成算法的不足,介绍球面不同集合V图的定义,在此基础上提出球面偏置曲线的概念并总结了它的性质,具体分析不同集合在球面上的偏置结果及处理方法,提出基于球面偏置的多集合V图生成算法,通过实验检验算法的正确性与效率,最后得出结论和进一步的研究方向。  相似文献   

Astrometrische Verwendung der zweiten kurzen Exposition auf Tautenburger Pilotprogrammplatten     

R.-D. Scholz 《Astronomische Nachrichten》1987,308(6):375-378

To overcome a possible magnitude equation the Tautenburg Schmidt plates of the Lohrmann programme were taken with a long 20-minute exposure (System A) and a short 20-second exposure (System C) displaced about 0·5 minute of arc in declination from the long exposure. The distance between the two images in dependence on the magnitude of a star and its position on the plate was analysed. The transformation of coordinates from system C to A can be performed by using first order polynomials. No higher order terms were found to be necessary. The coefficients of the polynomials can not be assumed as constant for all plates but must be computed from least squares solutions involving a sufficient number of stars on each plate. For three of four plates investigated significant orthogonal linear terms were detected.  相似文献