A world (.wld3) file is a text file containing control points that describe a coordinate transformation. A world file can be used to extend the properties of a Revit model or a CAD drawing to include georeferencing information. The information is stored as coordinate values that define one or two displacement vectors called links.
The data comprises three or four lists of coordinates organized into two rows. Each row defines a displacement link using the following syntax: <From x,y,z> <space> <To x,y,z>. The first pair of coordinates in each row corresponds to the source coordinates, also known as the from coordinates. These values represent the x,y location of any known control point in the CAD drawing. The second pair of coordinates in each row corresponds to the destination coordinates, also known as the to coordinates. These values represent a new location in geographic space, typically a reference point in another feature layer.
The data looks similar to the following:
25933.063000,9032.704720, 1702332.110159,309622.102491,-8987.532001,1300.050854 32047.556994,13057.483520 1706354.400361,303697.073028,-9091.566340,1337.519601