Currently, a DEM (Digital elevation Model) of high density range has been able to be created by spread of airborne laser scanner. However, when the DEM is created, the points of the DEM can not be interpolated accurately in some cases. Therefore, we propose a method of accurately interpolating the points of the DEM. The proposed method is performed by using joint singular value decomposition. Through the experiments using the DEM of 5m mesh, we demonstrate the effectiveness of our interpolation method.%三次元の地形データを表現する場合，正規メッシュのDEM(Digital Elevation Model)や不規則な三角網のTIN(Triangulated Irregular Network)が良く利用されている（村井ら，2008)。近年では，メッシュ間隔が数mという高密度なDEMも登場し，微地形を考慮した内水氾濫危険区域抽出（平岡ら，2011)や河川氾濫解析（舘澤ら，2010)などの多くの分野で利用されている。
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