采煤沉陷区数字地形图更新的一种实现方法

基于开采沉陷预计的采煤区下沉等值线图不便于直观地反映矿区地形的动态变化，其图形数据结构与数字地形图存在差异，难以直接用于规划设计和矿区GIS分析。支中针对现有开采沉陷预计模型的特点，以通用数字化成图系统为操作平台，经过简单的数据处理后，实现了矿区大比例尺数字地形图的预测更新。实例应用表明，更新后的图形数据结构与原地形图完全相同，其精度满足大比例尺地形图的要求，可作为开采沉陷区土地规划和建立矿区地理信息系统的基础图件。

Implementing of updating digital terrain map in mining subsidence area

The settlement isoline map,based on subsidence prediction in mining area,is difficult to be directly applied to land planning in mining area and MGIS analysis due to its different data structure from digital terrain map.In accordance with peculiarity of existing prediction model,the renewal on digital terrain map with large scale is actualized in the current digital mapping system with simplified data processing.An example indicates that the updated map,taking on the same data structure with original terrain map and the precision being satisfied with demands of terrain map,can be applied to land planning and MGIS used as basic datum.