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You can use the following tools to measure Nearmap's 3D imagery:

Location tool

  1. While in 3D, select the location tool.


  2. Click on a location in the map. When you access the Location tool you will see a disk that follows the surface.

NOTE: There is no right-click pin drop action in 3D.




Once you drop the pin onto the terrain, a balloon appears about 5m at true vertical above the pin.

What you need to know about the location pin:

  • A pin placed in the open will result in a flag raised to about 5m above the surface. This may be the ground, or any other open surface, such as a car park rooftop.
  • A pin placed near a object like a building will result in the flag being raised above the height of that object, so that the flag can be visible from multiple directions.
  • In all cases the elevation returned is the point that the user clicks on the surface (the 'pin').



Location Information

The displayed information includes:

  • The address of the location, if any.
  • The latitude and longitude of the location in two modes: decimal, e.g. -33.694841, 150.317237, and degrees/minutes/seconds, e.g. -33°41'41", 150°19'2".
  • WATCH button, which you can use to add the location to your watchlist. Please refer to Managing Your Watchlist for more information.
  • If there are oblique photos for the location, you can click VIEW OBLIQUE PHOTOS, as explained in Panorama and Oblique Imagery.


With the 3D location pin you see the elevation value relative to mean sea level.

3. Select the units from the dropdown to display your units of choice.


Removing the location pin

To remove a pin, click it to select it, then click the trash icon or press the Delete key on your keyboard.


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

Line Tool

You can measure lines in 3D using the Line tool.

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

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 - 11" or 28cm RMSEr, Vertical - 16" or 40cm RMSEz

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.

What geod models are used with Nearmap's 3D imagery?AU: AHD (AusGeoid09)
US: EGM2008 
Canada: CGVD2013



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