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The 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 Line Tool for Obliques.

This guide includes the following sections:

When Should You Use This Tool

The Line tool provides a simple way to measure the slope of gable roofs and other similar structures from oblique photos in MapBrowser. Use the Area Tool if you want to measure other parts of the roof section.

This tool is not suitable for measuring the pitch of hip roofs, you can use the Area Tool for this.

Roof Pitch Units

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 Line Tool

To access the Line tool for obliques 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 Line tool:

Measuring Lines

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 lines.

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

Tips for Measuring Lines

  • Zoom in as much as possible and take your time for best results
  • Always draw along the edge of the roof section you want to measure

  • Switch back to the Primary view to check line placement and orientation if you are not sure

  • You can also choose another photo from a different direction from the drop-down list

If you draw the line when not zoomed in, the result is a less accurate measurement:

When zoomed out too far the pitch is 18.3 degrees:

When zoomed in the pitch is 20.6 degrees:

Note: Viewing Oblique photos and measuring lines are available only in the New MapBrowser.

Exporting Image with Lines

You can use the Export Tool to export a screenshot, which will include the 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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