高程异常值微机自动查询系统的研究与设计

Query system of elevation anomaly through computer

提出了高程异常等值线图的数字化和数据提取方法,建立了区域内高程异常数据库,采用距离加权、最小二乘插值、梯度插值三种实现了任意点高程异常值的解算,解决了大地坐标和高斯直角坐标的转换,等值线图的显示、缩放、漫游等关键技术问题。采用面向对象的VB编程方法,开发了高程异常值的微机自动查询系统,可为测绘有关部门提供任意点的高程异常值。

In the paper, the query system of elevation anomaly in the computer is introduced , which is developed by Visual Basic. And the system aims at the present situation of enquiring elevation anomaly by handwork. The system solve well some critical questions of digitizing elevation anomaly isograms, establishing memory bank of elevation anomaly、inserting arbitrary elevation, coordinating transform, minifying the elevation anomaly isograms and divagating isograms .At last the system is tested by part of data of the small-scale elevation anomaly map in the north of China. The system抯 precision is reliable and operation is easy. And the function mainly meets the requirement of design. It can provide much information to the plotting department.