论文部分内容阅读
地形图与航空像片都是林业调查的基础资料和重要工具。正确而熟练地使用地形图和航空像片可使调查工作提高质量、加快进度,并减少野外测绘工作。因此每个林业调查人员都必须很好地掌握地形图及航空像片的基本原理和使用技术。地形图和航空像片都是国家机密资料,有重要的军事价值,特别是边境地区,更为重要。为此在使用时,一定要妥善保管,不得失密。若需使用时,可向省(区)测绘局(处)申请领用。地球表面是一个山川起伏的自然实体,而
Topographic maps and aerial photographs are the basic data and important tools for forestry investigation. The proper and proficient use of topographic maps and aerial photographs can enhance the quality of investigations, speed up the process and reduce the need for field mapping. Therefore, each forestry investigator must have a good grasp of the basic principles and techniques of using topographic maps and aerial photographs. Topographic maps and aerial photographs are all state secrets and have important military values, especially in border areas. It is even more important. To this end when in use, must be properly kept, not to be secret. If you need to use, you can apply to the provincial (district) Bureau of Surveying and Mapping (office) to receive. The surface of the earth is a natural, undulating natural entity