- insert a side-view image which is contain measurable distance and any single roof-side
- add pysical reference by click and drag on the side-view image
- add roof reference by click and drag on the side-view image
- insert a top-view image which is the same roof-side in the side-view image
- add roof boundary-box by click and drag on the top-view image
- add roof reference by click and drag on the top-view image
- add Pysical Reference Distance in textbox