Use the Height and Width tools to measure the vertical height and width (assumed horizontal) of a structure from an oblique photo.
Drawing the height measurement
- Switch to the Oblique base layer.
- Click the Height tool.
- Zoom into the structure you want to measure. Start by selecting the ground point from which you are measuring.
- Measure to the top of the building or object. The height line will always draw at true vertical. It can't be used for angles other than 90 degrees to the ground.
Once you are done, you can change to any view, and the height measurement will still be there.
NOTES:
- To choose the correct point, it helps to imagine where the two lines of the top of the building intersect.
- Note that the line is perpendicular to the ground (at a 90 degree angle).
- For buildings that are not standard in shape, the line should still be at 90 degrees to the ground from the point at which you wish to measure height — just as if you were standing on the top of the building, and dropping a plumb line to the ground.
Drawing the width measurement
- Switch to the Oblique base layer.
- Click the Width tool.
Zoom into the structure you want to measure. Zoom in as much as possible and take your time for best results. Drawing when not zoomed in may result in a less accurate measurement.
- Click the beginning of your measurement and then double-click the end of your measurement.
Once you are done, you can change to any view, and the width measurement will still be there.
NOTES:
- Measuring at the ground level provides the most accurate measurement of the object.
- Measuring in the middle or the top of a building is less accurate , due to the offset created by the change in perspective.
- The accuracy is less affected when measuring width on smaller buildings, such as residential buildings.
- The accuracy is affected slightly more when measuring width on taller buildings, such as high-rise buildings.
- From the Photos list, you can choose another photo taken from a different direction.
