.. _measure:

Measuring
=========

To compute distances or areas, use :class:`QgsDistanceArea` class. If projections are turned off, calculations will be planar,
otherwise they'll be done on ellipsoid. When ellipsoid is not set explicitly it uses WGS84 parameters for calculations. ::

  d = QgsDistanceArea()
  d.setProjectionsEnabled(True)
  
  print "distance in meters: ", d.measureLine(QgsPoint(10,10),QgsPoint(11,11))


**TODO:** area, planar vs. ellipsoid