Geografic-Information-System/misc/m.measure/m.measure.html

<h2>DESCRIPTION</h2>

<em>m.measure</em> provides the user with a way to measure the lengths
and areas of lines and polygons. Areas can be stated in acres,
hectares, square miles, square meters and square kilometers.

<h2>EXAMPLES</h2>

Distance example in a latitude-longitude location (on great circle, i.e. an orthodrome):

<div class="code"><pre>
Bonn_DE="7.09549,50.73438"
Philadelphia_US="-75.16379,39.95233"

m.measure coordinates="$Bonn_DE,$Philadelphia_US" units=kilometers 
Length:  6217.916452 kilometers
</pre></div>

<div align="center" style="margin: 10px">
<a href="m_measure_distance.png">
<img src="m_measure_distance.png" width="600" alt="Visualization (with d.geodesic) of m.measure distance example" border=0><br>
</a>
<i>Visualization (with d.geodesic) of m.measure distance example</i>
</div>

<p>
As an example for the North Carolina sample dataset, here four points
describing a square of 1000m side length:

<div class="code"><pre>
m.measure units=meters \
  coordinates=922000,2106000,923000,2106000,923000,2107000,922000,2107000
Length:  3000.000000 meters
Area:    1000000.000000 square meters

# script style output:
m.measure -g units=hectares \
  coordinates=922000,2106000,923000,2106000,923000,2107000,922000,2107000
units=meters,square meters
length=3000.000000
area=1000000.000000
</pre></div>

<h2>SEE ALSO</h2>

<em>
<a href="d.geodesic.html">d.geodesic</a>
</em>

<h2>AUTHORS</h2>

Glynn Clements
<br>
Some updates by Martin Landa, CTU in Prague, Czech Republic
<br><br>
Derived from d.measure by James Westervelt, Michael Shapiro, U.S. Army
Construction Engineering Research Laboratory

<p><i>Last changed: $Date$</i>