我们利用现有航测资料,为森林调查编制和提供中小比例尺象片平面图和图解图已有较长的时间并取得了良好的效果,但象片图在林业局局场规划上的应用几乎是空白,近几年来随着林业调查规划工作的发展,林业规划所需要的大比例尺地形图和象片图日益增多,采用大平板仪和其他仪器的作业,已难以满足要求。 We have made use of the available aerial survey data to prepare and provide small and medium sized scale plan and plan maps for forest surveys for a long time and have achieved good results. However, the application of pictogram to the field planning of the Forestry Bureau is almost empty In recent years, with the development of forestry investigation and planning work, the large-scale topographic maps and image maps required for forestry planning have been increasing. It has been difficult to meet the requirements for using large flat panel meters and other instruments.