When preparing a floor plan graphic for use in predictive and manual site surveying, what...

Use the known size of a small object, such as a ceiling tile, and use a single instance of this object (e.g. a single ceiling tile) to scale the

floor plan.

Measure the width of an actual office doorway with a tape measure and use this value to calibrate against a doorway graphic.

Use the longest available measurement (like a straight exterior wall) to calibrate the graphic's scale.

Calibrate the ceiling height of the floor plan first, then the survey software should be able to auto-calibrate the X and Y planes of the

graphic.