大面积数字化成图DTM建立与地物编辑的方法研究

DTM建立与地物编辑方法是影响大面积数字化成图效率的主要因素．本文介绍如何在坎上下及地性线上加点，可以在建立DTM过程中不用考虑坎高及地性线等约束条件。从而提高DTM的建立速度。在数据分类基础上对地物进行分层绘制可以提高绘图效率．整幅绘制等高线及地物，利用窗口裁剪的方法进行分幅，可使地形图分幅达到无缝接边。

The DTM Establishing and Geo- objects Editing Method Research in Large Area Digital Mapping

The DTM establishment and the method of editing Geo-objects in large area Digital Mapping are important factors in mapping efficiency.This article introduce how to add points on Escarpment top and bottom,and on terrain feature lines.According to adding point we may not consider terrain feature lines and other restrict conditions in establishing of DTM,so as to Raising DTM establishing speed.We can raise mapping efficiency on the basis of classification of data and drawing Geo-objects in different layers.Draw contour lines and Geo-objects on the whole map,then use dividing Mapping unit Metheds,we may Adjoin the Seamless Digital Topographic Map.