This is often done when making techniques drawing. When importing images, dimensions not in accordance with the original image, or change the image scale. So….. double check this.
If not in accordance with the original, use the Tape Measure tool to make it fit. Change dimensional in one part of the drawing will directly change the scale or dimensions of buildings.
For more clearly, follow this interactive tutorial. Please note to click the Play/Next button and the following button to see the interactive tutorial.
Related Google SketchUp Tutorial: