LiModel file stores triangulated regular network models generated by DEM or DSM. It saves regular grid nodes and block-organized triangulated regular network models according to quadtree. DOM texture information can be superimposed on the model. LiModel could be transformated from massive data of DEM or DSM. It supports editing operations including flatten height, smooth height, noise points removal and so on. After editing, it can be exported to Tiff file for generating contours.