白底涤纶片是近年发展起来的一种新型摄影材料。用它代替像纸裱板片供立体量测仪描绘地貌具有价格低、少一道裱板工序、摄影处理过程中受气温、水温影响较小、携带轻便、不怕摔碰等优点,深受各航测制图单位的重视。但因在地貌描绘中如何压平的问题一直未得到很好的解决,故影响其推广使用。目前,各航测制图单位使用白底涤纶片在 White polyester film is developed in recent years, a new type of photographic materials. Use it as a substitute for paper and board for stereoscopic measuring instrument to depict the landscape with low prices, a less boarding process, the photographic process by the temperature, water temperature less affected, portable, not afraid of throwing, etc., by the aerial survey Cartographic unit of attention. However, the problem of how to flatten the landscape in the landscape has not been solved very well, so the promotion of its use. At present, each aerial mapping unit uses white polyester film