Summary: RoofSnap provides accurate scale for all included aerial and satellite imagery sources. Imported Imagery requires the user to provide one (1) on-site scale measurement.
For all imagery sources provided by RoofSnap, the scale is already set, so no physical measurement is necessary to measure.
Although we do provide pitch finding tools in RoofSnap's iOS app and label pitch whenever possible in SketchOS reports, on-site verification is always advised.
When importing an image from a drone, blueprint, or architectural drawing, the user must supply one (1) scale measurement.
Watch this tutorial video to see the process: