巧用等值线追踪法求取地震采集设计区域边界
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摘要
在地震采集设计时,观测系统优选论证是最基础也是最重要的一步。通常会根据不同的炮检点布设方案求取炮检点或者不同覆盖次数面元格点分布的限定多边形边界,然后求取其面积或者其内部点分布密度等参数,更多的是利用这些边界以各种底图为背景进行投影成图。如果是复杂的边界形状且没有一种反求边界的方法,则只能逐个读取点的坐标,然后手工输入坐标序列,计算、成图等操作,这个过程费时又费力。这里讨论在给定不同点集的情况下,利用矩形网格数据格点等值追踪法,求取并自动有序排列边界多边形控制点坐标,直接转换输出地震采集设计软件可用的障碍物数据格式,方便设计过程中的使用。研究证明,这种区域边界的求取方法能够满足大部分理论设计的需要,减少手工勾勒及人工读取边界坐标值的繁琐过程,实现坐标求取和应用一步到位,大大提高了边界坐标求取的准确度及采集方案设计工作的效率。
Observing system preferred demonstration is the most basic and important step in seismic acquisition design process.Designers usually obtained the polygon of boundary depending on the distribution of shots and receivers points or bin grid nodes with different fold number,and then calculate its area or internal point density and so on.It is more useful to map these boundary and projection them onto a variety of background image.You can only read point coordinates one by one and manually enter the coordinates sequence,which is time-consuming and laborious,for subsequent calculations,mapping and other operations when boundary shape is complex and there is no way to obtain the boundary coordinates.This article discusses how to calculate and automatically sort the point coordinates of boundary polygon in different case of a given set of points by equivalent tracing of rectangular grid data node,and then how to directly output available obstacle data format for the seismic acquisition design software to facilitate the design process.It is practical proved that method for calculating the boundary of point set can meet the needs of most of the theoretical design.The labour of hand outlining boundary and one by one reading boundary coordinate values is significantly reduced.Calculating and applications of boundary coordinates can be finished at the same time.It is greatly improved the accuracy of calculating the boundary coordinates and efficiency of acquisition program design.
Observing system preferred demonstration is the most basic and important step in seismic acquisition design process.Designers usually obtained the polygon of boundary depending on the distribution of shots and receivers points or bin grid nodes with different fold number,and then calculate its area or internal point density and so on.It is more useful to map these boundary and projection them onto a variety of background image.You can only read point coordinates one by one and manually enter the coordinates sequence,which is time-consuming and laborious,for subsequent calculations,mapping and other operations when boundary shape is complex and there is no way to obtain the boundary coordinates.This article discusses how to calculate and automatically sort the point coordinates of boundary polygon in different case of a given set of points by equivalent tracing of rectangular grid data node,and then how to directly output available obstacle data format for the seismic acquisition design software to facilitate the design process.It is practical proved that method for calculating the boundary of point set can meet the needs of most of the theoretical design.The labour of hand outlining boundary and one by one reading boundary coordinate values is significantly reduced.Calculating and applications of boundary coordinates can be finished at the same time.It is greatly improved the accuracy of calculating the boundary coordinates and efficiency of acquisition program design.
引文
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[2]韩同春.面向对象技术在勘察软件开发中的应用[J].物探化探计算技术,2003,24(3):277-278.HAN T CH.Object oriented technology applying in software development[J].Computing Techniques for Geophysical and Geochemical Exploration,2003,25(3):277-278.(In Chinese)
[3]马永卓,周之平,黎明.基于离散点的任意多边形构造算法研究[J].南昌航空大学学报:自然科学版,2012,26(4):50-55.MA Y ZH,ZHOU ZH P,LI M.Study on arbitrary polygon algorithm based on discrete points[J].Journal of Nanchang University of Aeronautics:Natural Science Edition,2012,26(4):50-55.(In Chinese)
[4]刘吉余,许洪东,王长生,等.任意面积储量计算方法研究[J].物探化探计算技术,2003,22(1):75-76.LIU J Y,XU H D,WANG CH SH,et al.Research on the Calculation Method of Arbitrary Area Reserves[J].Computing Techniques for Geophysical and Geochemical Exploration,2003,22(1):75-76.(In Chinese)
[5]郭水平,陈锦昌.基于白色与黑色像素区域相间明显的快速边界获取的方法[J].工程图学学报,2005(04):104-108.GUO SH P,CHEN J CH.A Method of quickly acquiring of edge base on white and black pixel region[J].Journal of Engineering Graphics.2005(04):104-108.(In Chinese)
[6]郭志宏.一种实用的等值线型数据网格化方法[J].物探与化探,2001,25(3):203-208.GUO ZH H.A practical contour type data gridding method[J].GEOPHYSICAL AND GEOCHEMICAL EXPLORATION,2001,25(3):203-208.(In Chinese)
[7]宋丽娟,龚晓峰,钟猛.基于网格法的等值线绘制方法[J].现代电子技术,2005(14):65-67.SONG L J,GONG X F,ZHONG M.Method of drawing isoline based on grid method[J].Modern electronic technology,2005(14):65-67.(In Chinese)
[8]吴卫华,袁宁,陈爱斌,等.基于格网的等值线生成算法的研究[J].实验与研究,2003(4):28-30.WU W H,YUAN N,CHEN AI B,et al.Study on contour generation algorithm based on grid[J].Experiment and research,2003(4):28-30.(In Chinese)
[9]周培德,王树武,李斌.连接不相交线段成简单多边形(链)的算法[J].工程图学学报,2002,14(6):522-525.ZHOU P D,WANG SH W,LI B.Connecting non intersecting line segments into a simple polygon(chain)algorithm[J].Journal of Engineering Graphics,2002,14(6):522-525.(In Chinese)
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