Before you upload

Image capture guidelines

Measurements are derived from perspective correction, which assumes the photo was taken roughly as described below. Photos taken very differently will still produce a result, but the measurements will not be reliable.

1. 1

   Hold the camera at chest height

   Roughly 1.4 m from the ground, kept level — not tilted down.

2. 2

   Stand about 2 m from the defect

   The defect should sit in the middle of the frame, not at an edge.

3. 3

   Capture in daylight

   Clear, evenly lit conditions. Not at night, in heavy rain, or on flooded road.

4. 4

   Keep the road surface unobstructed

   Avoid vehicles, people and shadows across the defect where you can.