目前在森林调查中,普遍采用航空象片,先在野外调查勾绘林、小班,再借助某种仪器或采用某种方法将象片上的林、小班转绘到底图上去,然后再在底图上进行面积量算,得到林、小班面积。把象片上的林、小班转绘到底图上是一个相当繁杂的过程,工效不高,往往要花费 Currently in the forest survey, the widespread use of aerial photographs, the first survey in the field painted hook forest, small classes, and then use some kind of instrument or a certain method of the image on the forest, small classes transferred to the end of the map, and then on the bottom map On the amount of area, get forest, small class area. The image of the forest, small classes transferred to the end of the map is a very complicated process, ineffective, often cost