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.
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。
Most image generation algorithms scan image pixels according to top-to-bottom and left-to-right scanning; calculate the value of every pixel.
大多数的图像生成算法，都是按照从上到下从左到右的顺序扫描图像，计算每个像素点的颜色值。
Most image generation algorithms scan image pixels according to top-to-bottom and left-to-right scanning; calculate the value of every pixel.
大多数的图像生成算法，都是按照从上到下从左到右的顺序扫描图像，计算每个像素点的颜色值。
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