METHOD FOR SEARCHING A ROOF FACET AND CONSTRUCTING A BUILDING ROOF STRUCTURE LINE

摘要

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.

主权项

1. A method for searching a building roof facet and reconstructing a building roof structure line from a plurality of building roof facets, comprising the steps of:
(a) composing each of the plurality of building roof facets by lidar point clouds, respectively, and picking up at least an optimal roof facet by using a progressive roof facet searching process; and (b) projecting the roof facets onto a 2-dimensional space and determining an intersection stage of the roof facet by using of morphology, to determine an area of the roof structure line, establishing an initial boundary line, establishing each of structure lines by considering aerial imagery to generate a roof structure line in a 3-dimensional space, and enhancing an accuracy of the roof structure line by using the lidar point clouds.