ArcView中栅格图像与矢量图的融合技术

通过创建与栅格图像相对应的WORLD文件，可以实现栅格图像与矢量图的融合．WORLD文件可以由任何编辑器创建，WORLD文件一般是以图像文件名加上“w”来进行命名．WORLD文件中有6个变换参数，按顺序为A，D，B，E，C和FA值为栅格图像X方向以地图单位为单位的栅格长度，E为Y方向以地图单位为单位的栅格长度的负值，该两值可以在栅格图像文件的属性中获得．C，F值为栅格图像左上角像素中心在地图上的X，Y坐标，其值可以根据特征点在地形图中的坐标量测获得．D，B为旋转因子，如果没有图像的旋转，则均为0．在ArcView矢量化的视图中，添加附带有相应WORLD文件的栅格图像时，系统将自动调用文件中包含的地理坐标变换信息进行坐标数据的转换。

Merging technique of raster and vector images on ArcView

The merging of raster and vector image can be carried out by creating WORLD file relevant to the raster image. The WORLD file, generated by any editor, can be named by adding "w" to the image file name. Six transformation parameters are included :A, D, B, E, C, F.A or E value, the length of each pixel in X or Y direction, can be calculated from attributes of raster image. C or F value, the X and Y coordinates of the center of a pixel at the up-left corner of the image, can be measured according to characteristic point in topographic map. D or B, the rotation factor, is zero if no image rotation is indicated. In the vector image of ArcView, the data merging will be automatically completed by searching for coordinate transformation information in WORLD file once the raster image is loaded.