A system for lean ortho correction for computer models of structures, comprising: a processor for processing a structure model stored in a non-transitory memory; a user interface in communication with the processor; and computer system code executed by the processor, the computer system code causing the processor to: display an orthorectified image of a structure on the user interface; project the structure model onto the orthorectified image; identify, via a user input, a first world three-dimensional ("3D") point in the orthorectified image; identify, via a user input, a second world 3D point in the orthorectified image; identify, via user input, a third world 3D point in the orthorectified image; characterized by: adjust the structure model by transforming coordinates of the structure model using the first world 3D point, the second world 3D point, the third world 3D point, and a lean ortho correction algorithm to compensate for lean in the orthorectified image, the lean ortho correction algorithm calculating at least one lean value and at least one lean vector for each of the first, second, and third world 3D points and applying the at least one lean value and the at least one lean vector to transform the coordinates of the structure model; and project the adjusted structure model onto the orthorectified image. a processor for processing a structure model stored in a non-transitory memory; a user interface in communication with the processor; and computer system code executed by the processor, the computer system code causing the processor to: display an orthorectified image of a structure on the user interface; project the structure model onto the orthorectified image; identify, via a user input, a first world three-dimensional ("3D") point in the orthorectified image; identify, via a user input, a second world 3D point in the orthorectified image; identify, via user input, a third world 3D point in the orthorectified image; characterized by: adjust the structure model by transforming coordinates of the structure model using the first world 3D point, the second world 3D point, the third world 3D point, and a lean ortho correction algorithm to compensate for lean in the orthorectified image, the lean ortho correction algorithm calculating at least one lean value and at least one lean vector for each of the first, second, and third world 3D points and applying the at least one lean value and the at least one lean vector to transform the coordinates of the structure model; and project the adjusted structure model onto the orthorectified image. display an orthorectified image of a structure on the user interface; project the structure model onto the orthorectified image; identify, via a user input, a first world three-dimensional ("3D") point in the orthorectified image; identify, via a user input, a second world 3D point in the orthorectified image; identify, via user input, a third world 3D point in the orthorectified image; characterized by: adjust the structure model by transforming coordinates of the structure model using the first world 3D point, the second world 3D point, the third world 3D point, and a lean ortho correction algorithm to compensate for lean in the orthorectified image, the lean ortho correction algorithm calculating at least one lean value and at least one lean vector for each of the first, second, and third world 3D points and applying the at least one lean value and the at least one lean vector to transform the coordinates of the structure model; and project the adjusted structure model onto the orthorectified image. adjust the structure model by transforming coordinates of the structure model using the first world 3D point, the second world 3D point, the third world 3D point, and a lean ortho correction algorithm to compensate for lean in the orthorectified image, the lean ortho correction algorithm calculating at least one lean value and at least one lean vector for each of the first, second, and third world 3D points and applying the at least one lean value and the at least one lean vector to transform the coordinates of the structure model; and project the adjusted structure model onto the orthorectified image.