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The 3D line tool allows you to measure the pitch of a roof or other structures from an oblique photo.

In addition to this document, you can view our video on how to use the 3D Line Tool.

In the building construction, roof pitch is often measured in inches, and expressed as a ratio of a roofs vertical rise to its horizontal run (span). Roof pitch can also be expressed as an angle, measured in degrees. 

Both units of measurements are available in the New MapBrowser.

Accessing the 3D Line Tool

To access the 3D line tool go to the location you want, then switch to oblique view, either by clicking the View Oblique Photos in the location information, or by using the compass tool:

Once you are in oblique view, click the 3D Line tool:

Measuring 3D Line

Zoom into the property you want to measure, then draw a line along the slope you want to measure:

Click Next, and you will see the vertical view of that property. Drag the line to the slope you are measuring:

You will now be able to see the pitch in degrees, and the rise/run ratio, as well as the length.

You might find it helpful to click between the primary view and the secondary view when you are measuring the 3D lines.

Once you are done, you can change to any view, and the 3D line will still be there. In this example, the view is now oblique with South orientation:

Tips for Measuring 3D Lines

  • Zoom in as much as possible for best results
  • Alternate between primary view and secondary view until you are happy with your measurement 
  • You can also choose another photo from a different direction from the drop down list
  • The tool is not suitable for measuring the pitch of hip roofs, you can use the 3D Area Tool for this
Note: Viewing Oblique photos and measuring 3D lines are available only in the New MapBrowser.

Exporting Image with 3D Line

You can use the Export Tool to export a screenshot, which will include the 3D line measurements and the survey date:

Note: The survey date in the screenshot may differ from the actual capture date of the image, as explained in Survey Date and Photo Time.

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