【摘要】 基于等高线和其他地形特征要素构建的TIN模型,再内插生成DEM往往存在大量不合理平三角形造成的平坦区域.针对这些不合理的平坦区域提出了利用空间分析的方法,对其进行修正,使得DEM逼近地形特征.首先提出了利用似圆度以及其他参数对不同类型的平三角形进行归类,进而将不合理的平区域提取出来,然后针对不同类型的平区域使用不同的处理方法.对山顶造成的平区域采用了增加内插点的方法.对等高线曲率比较大的地方以及鞍部形成的平区域,采用平区域的缓冲区选择方法提取影响平坦区域内插值的高程点,采用局部内插方法获取其平坦区高程值,通过叠加运算的方法来修正不合理平坦区.最后通过实验验证了此方法的有效性.更多还原

【Abstract】 There are lots of flat areas in the TIN DEM,which is created with contour lines and then interpolated into grid DEM.The amendment of the flat areas with spatial analysis methods is proposed to make the DEM more accuracy.The new concept of similar circle degree of polygon is put forward,and different kinds of plane triangles are classified by similar circle degree and other parameters.The illogical flat areas are selected and dealt with different measures separately.The method of adding the elevation point is used to the flat areas of mountaintop.To the flat areas that are nek or have large curvature of contour lines,the method of selecting the buffer of flat areas is adopted to select the elevation points which influence the interpolation value of flat areas,then the partial interpolation method is introduced to obtain the elevation value of flat areas,and the superposition operation is used to amend the illogical flat areas.The efficiency of this method is proved though experiment.更多还原