Abstract: A method for searching a building roof facet and reconstructing a roof structure line, in which the searching is performed automatically and without limitation of how slope of the roof facet, and the building structure line is constructed through aerial imagery. At first, lidar point clouds on the roof are extracted to compose a roof facet by using coplanarity analysis, and the roof is differentiated to a possible flat roof and a pitched roof. An optimal roof facet is obtained by analyzing lidar point clouds to overcome the low pitched facet issue. A relationship of a roof facet on a 2-dimensional space is analyzed to ascertain an area of a roof structure line. An initial boundary is generated. Line detection is performed on the images and a roof structure line segment is composed. All the structure line segments are used to reconstructing a 3-dimensional building pattern in object space.

Abstract: A method for searching a building roof facet and reconstructing a roof structure line, in which the searching is performed automatically and without limitation of how slope of the roof facet, and the building structure line is constructed through aerial imagery. At first, lidar point clouds on the roof are extracted to compose a roof facet by using coplanarity analysis, and the roof is differentiated to a possible flat roof and a pitched roof. An optimal roof facet is obtained by analyzing lidar point clouds to overcome the low pitched facet issue. A relationship of a roof facet on a 2-dimensional space is analyzed to ascertain an area of a roof structure line. An initial boundary is generated. Line detection is performed on the images and a roof structure line segment is composed. All the structure line segments are used to reconstructing a 3-dimensional building pattern in object space.