Page tree
Skip to end of metadata
Go to start of metadata

You can measure lines in 3D imagery Line tool.

You can also measure Lines and Areas using Nearmap's Oblique imagery.

Watch the video: MapBrowser - 3D Viewer & 3D Export

Accessing the Line Tool

To access the Line tool for 3D imagery go to the location you want, then switch to 3D view by using the compass tool. Once you are in 3D mode, you won't be able to use the Location tool, but you can still use the Search tool.

When you are in 3D 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.

When you access the Line tool you will see a disk that aligns to the surface it is on:


The disc reflects the surface slope and angles as you move over them, and this can help you decide where to start and end the line you are measuring:

The measurements include:

  • Line length - the distance between the both ends of the line in meters, kilometers, feet, yards, miles, or nautical miles.
  • Pitch - the angle of the line relative to the horizon in degrees or rise/run ratio.
  • Relative height - the difference in height between both ends of the line in meters, kilometers, feet, yards, miles, or nautical miles.

You can choose the colour of the line. 

Once you are done, you can zoom in and out, pan, and tilt, and the line will still be there.


Measurement Accuracy

The greatest source for error when measuring distances less than approximately three km is your ability to select the start and end points correctly.

The 3D scene has the following spatial accuracy specifications: Horizontal - 23.5cm RMSE, Vertical - 40cm RMSE.

Assuming an object is well constructed as described above and the correct start and end point for a desired measurement can be chosen, measurement should be within 40cm.


Measuring in 3D FAQs

QuestionAnswer

Will there be other measurement tools for 3D imagery?

The 3D tool set will be expanded over time. We would love to hear what tools you would like included in the future.

How do I know if my measurement line end point is at the spot I meant it to be at?

Lines will begin and end on the surface of the 3D mesh, when using the line tool a disc is used as a guide to the surface you are hovering over. This disc will reflect the surface slope and angles as you move over them and this can help you decide where to start and end your line.

Changing the camera position may also help you validate if you put the point where you wanted to put it, though at some angles seeing the line in front of the building may be confusing.

Why is the measurement different to the equivalent one I made in Obliques view?

The most difficult part of measuring using either method is accurately picking the top and bottom of the object due to shadows, obstructed views and the limits of resolution. With practice behavior becomes more consistent, and in tests of measuring with both 3D and oblique images, results are consistently within about 1 meter of each other.

Which measurement is more accurate, 3D or Obliques?

The accuracy of the measurement tool is the same, so this will largely come down to how well the object in question has been resolved through either method and will vary from object to object. In practice the method that allows you to choose the top and bottom most clearly will likely result in the most accurate measurement.

Are my lines and measurements saved in projects?

Yes.



  • No labels