1. A method of correcting position data comprising: assigning a source location to an image; determining a building detail of a building in the image; extracting a building model corresponding to the building detail from a three dimensional scan; projecting a model detail from the building model onto the building detail from the image; adjusting the source location until the building detail and the model detail match within a limit value; recording an adjusted source location resulting from adjusting the source location until the building detail and the model detail match within the limit value.