摘要
通过传统纸质地图扫描而成的栅格影像在进行人工矢量化时,需对矢量数据进行坐标转换,耗时耗力且精度也往往受人为主观因素的影响。为了实现快速且准确的矢量化处理,提出了一种附带地理坐标识别的纸质地图快速矢量化方法。首先利用扫描后的栅格影像与经纬度模版影像进行SURF特征匹配,从而获取经纬度标识信息和对应的横纵坐标信息;再计算仿射变换模型参数;最后在矢量化的过程中实现由像素坐标到地理坐标的转换。实验结果表明,该方法不仅能实现栅格影像矢量化,而且可准确完成矢量数据的坐标转换,提高了纸质地图的矢量化处理效率。
In the process of manual vectorization of raster image based on scanning of traditional paper map,it needs the coordinate conversion of vector data,which is time-consuming and labor-intensive,and the accuracy is often affected by subjective factors.In order to achieve fast and accurate vectorization,we put forward a fast vectorization method for paper map with geographical coordinate recognition in this paper.We used the scanning raster images and latitude and longitude template to perform SURF feature matching,and obtained the latitude and longitude identity information and the corresponding horizontal ordinate information at first.And then,we calculated affine transform model parameters,and realized the transformation from pixel coordinates to geographical coordinates in the vectorization process.Experimental results show that this method can not only realize the vectorization of raster image,but also accurately complete the coordinate transformation of vector data,which can improve the vectorization efficiency of paper map.
出处
《地理空间信息》
2021年第11期63-65,70,I0006,共5页
Geospatial Information
基金
国家自然科学基金资助项目(41801274)。
