Practical Manual - Malareo

Open the Attribute Table for the Provinces layer. Select the Kwazulu Natal Province. It should
highlight on the map.
Clip:
Open the Clip Window from the Geoprocessing
Menu.
Under Input Vector Layer select
National_Roads_SA
Under Clip Layer select eThekwini. Make sure
that the "Use only selected features" box is
checked under the Clip Layer.
Click on Browse and give the output shapefile an
appropriate name. Make sure you are working in
the correct folder.
Click Ok. Select "Yes" when asked if you want to
add the new layer to the TOC.
Before
After
Buffer:
In order to make calculations based on proximity to features it is often necessary to create a
buffer of specific size around those features. This makes proximity calculations easier. In this
example we will calculate the number of health facilities within 2km of these National Roads.
o
o
o
o
Turn off the Provinces and
National_Roads_SA layers.
Zoom to the project extent.
Add the Health layer to the
current TOC.
Change the CRS of the Project
to Cape/UTM Zone36S. This is
important as we need to
make calculations in meters.
QGIS for Malaria Page 49