Practical Manual - Malareo

This means that only the biome we selected is being included in the calculation.
And use the result to: Create a new Selection.Click Apply
The Spatial Query window opens with the results of the Spatial Selection. In the Bottom left can be
found the results. In this case the result is 84 of 323 records have been selected. It is now possible to use
this window to define more spatial queries. It is also
possible to base the next query on the results that
have just been obtained from the first query. This is
done by choosing the "remove from current
selection" option in the "And use the result to"
section.
It is important to note that it is only possible to
REMOVE newly selected records from the current
selection after having performed a Spatial Query.
The results of the Spatial Query can also be found in the
Attribute Table of the Source Layer.
Measurements
One of the most common calculations that are performed using a GIS is the measurement of certain
objects. These measurements can be either lengths (road segments, perimeters, boundaries) or
distances (from one location to another).
These calculations are performed using the measure tool.
QGIS for Malaria Page 42