基于边缘控制的矢量数据空间校正方法研究

Research on space correction method of vector data based on edge control

针对目前各类地理信息数据来源不同导致多元时空数据不能准确匹配的问题,本文基于ArcGIS软件,对照正射影像图进行矢量数据空间校正,通过获取矢量数据边缘关键节点进行边缘控制,采用比例关系保持不变的空间仿射变换方式进行校正,对区域矢量校正后仍存在无法与影像图匹配的某些斑块,设置有限校正区域,采用橡皮板拉伸方式进行校正。试验结果表明,基于边缘控制的2种校正方法结合,能够实现矢量与正射影像图准确匹配,同时保证校正后区域与周边矢量数据准确接边。

Response to the problem of inaccurate matching of multivariate spatiotemporal data caused by different sources of geographic information data,this paper uses ArcGIS software to perform vector data spatial correction by comparing orthorectified images.By obtaining key edge nodes of vector data for edge control,a spatial affine transformation method with unchanged proportion relationship is used for correction.After regional vector correction,there are still some patches that cannot be matched with the image,set up a limited correction area and use rubber plate stretching method for correction.The experimental results show that the combination of two correction methods based on edge control can achieve accurate matching between vectors and orthophoto images,while ensuring accurate edge connection between the corrected area and surrounding vector data.