Traditional imaging satellites use a line scanner, similar to a Xerox machine, and as they traverse the Earth, they take pictures, scanning row by row by row to build the complete image.
传统的成像卫星采用行扫描仪 类似于复印机 随着它们穿越地球，它们进行拍照 逐行地进行扫描 从而建立完整的图像