Patent ID: 7391899

Claim:
A method comprising: receiving a first digital model of a first three-dimensional scene comprising a plurality of points and a plurality of objects, each object comprising a cluster of points; receiving a second digital model of a second three-dimensional scene comprising a plurality of points and a plurality of objects, each object comprising a cluster of points; performing a change analysis on the first and second digital models to provide a difference indication representing a difference between the first and second digital models, the change analysis including performing a digital model to database conflation comprising identifying objects in one digital model that are different from their counterpart objects in the other digital model to create a set of changed objects, deriving from the database additional attributes relating to each changed object, and creating an object level change database comprising information identifying each changed object and the additional attributes relating to each changed object; and providing a visual representation of differences between the first and second digital models with the visual representation comprising an image showing positive and negative object level changes in different colors.