Practical Manual - Malareo
Practical Manual - Malareo
Practical Manual - Malareo
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graduated display of them.<br />
Undertake a graduated Jenks 5 class thematic classification of the 1999 malaria figures.<br />
What differences can you see between this and the previous classification<br />
Interpolation<br />
QGIS has the option of interpolating to a<br />
raster surface from a series of points. It offers<br />
2 options (TIN) Triangular Irregular Network<br />
which uses a series of triangles to link points.<br />
And (IDW) Inverse Distance Weighting which<br />
uses the principle that influence of a point<br />
decreases as you move away from it.<br />
You will undertake a IDW interpolation.<br />
First you will load the KZN boundary file. Right<br />
click on the KZN layer and Zoom to Extents<br />
(This will ensure that the Interpolation covers<br />
a large enough area.<br />
Next you will open the interpolation tool from<br />
within the Plugins Drop Down menu.<br />
This opens the interpolation Plugin window.<br />
Change your input layer to:<br />
malaria_case-Health_facility<br />
Select Prevalence as your interpolation Attribute And add it to the Input layer by selecting Add<br />
Change the Interpolation method to IDW<br />
QGIS for Malaria Page 62