摘要
中小比例尺地形图因为分带不同,在进行数字图投影换带时会产生投影变形。为控制投影变形,常规做法是将原数字图分成很多小图块,并通过平移旋转或者加尺度变形对小图块进行线性变换,但这种方法工作量大、误差大且易出错。利用南方Cass绘图软件并结合自编程序对数字地形图进行投影换带,解决了不同投影带的数字地形图难以拼接的问题,是一种操作简单、实用、严密的投影换带方法。
As differences exist in zoning of medium and small scale maps,projection distortion can not be avoid in the process of transform and projection of digital maps.The conventional control measures for projection distortion are dividing the original digital map into several sub maps,and through translation and rotation or adding scale distortion,the sub maps are linearly transformed,which has the disadvantage of heavy workload,large error and mistakes-prone.Using South Cass survey software and combining with self-developed program to conduct transform and projection of digital maps,we successfully solve the difficulties of splicing maps with different projection zoning,which has the advantages of idea applicability and strictness.
出处
《人民长江》
北大核心
2010年第24期41-42,62,共3页
Yangtze River
关键词
CASS软件
数字地形图
投影换带
水利工程
Cass software
digital maps
transform and projection
water conservancy project
