This page describes the 3D measure functions available on Map 3D, all Mapping Tabs and Slice View Tab.
More information about Map 2D measure functions, see Map 2D Measurements
Main Toolbar > Measure > 3D
Tabs > Mapping > 1st View Side Toolbar > Measure icon
3D coordinates can be measured using following references :
Measure technique and options are set via the Measure Preferences, see Preferences of 3D Hover.
Important
When measuring using point cloud, only rendered points will be taken into account, see Point Cloud Legend and Viewing Restrictions.
More information about Point Cloud measurements and measurements by Forward Intersection
Once a measure function is activated, the appearance of the cursor indicates a coordinate can be added, replaced, removed or inserted :
Most measure functions do have a well known number of coordinates. These measurements is ended automatically once the number of expected coordinates is measured.
Only for the “Free Line” and “Free Area” measure functions, the number of coordinates is not defined beforehand. Finishing the free line and area measurement is slightly different depending the measure mode :
Absolute coordinates (xyz) are expressed in the Map coordinate system. If no vertical Map CRS is set, the Z of the used data source will be retained.
Results depending Map CRS
Relative measurements (distance, line, area, volume) are expressed in the projected coordinate reference system as defined by Map CRS. If a geographical Map coordinate system is used, relative measurements will be calculated in an on-the-fly calculated local projection centered around the first measured coordinate. This local projections returns the most realistic metric result at all time.
Depending the projection parameters of the projected Map CRS or the origin of the on-the-fly created temporary projection the same “object measurement” will return different result values
For example the Mercator projection conserves the angels, not the distances between different points. The distance increases closer to the poles. Have a look at the size of Greenland for example. It is about the same size as Saudi Arabia, about 2 million square kilometers.
Read more about the Coordinate reference systems and the supported systems here :
© Source image : http://www.heliheyn.de/Maps/GallPeters/GallPeters_E.html