Practical Manual - Malareo

Now to measure along the length of a line. The example for this is to measure a part of a road. Before
starting this exercise it is important to remove all our selections. To do this use the Deselect Features
from All Layers Button.
Add the eThekwini_roads Layer to the Table of
Contents.
Using the same technique as above, measure the
length of the N3 Highway in eThekwini.
It is also possible to measure the Area of a polygon feature. This is done using the same technique, but it
is important to set the Measure Tool to measure Areas.
Geoprocessing of Vector Data
The Geoprocessing of Vector Data requires the use of different Geoprocessing Tools. These
Geoprocessing Tools alter or transform a layer based on its Spatial Relationship to another layer. In QGIS
the Target Layer, that is the layer, being altered or transformed, is known as the Input Layer and the
layer being used for the alteration or transformation is known as the "Process" Layer, where "Process" is
the tool that is being used. For example, when using the Clip Tool, the layer being clipped is the Input
Layer and the layer whose boundaries are being used to give the reference terms for the clip is known as
the Clip Layer.
QGIS for Malaria Page 45