Practical Manual - Malareo

Use the health facilities layer and buffer this by 10 km. (Buffer)
This buffer indicates the travel distance cut off to a clinic.
Use this buffer to sum the number of people within reach of the clinic. This gives you an idea of load on
facility (Join Attributes by location)
Voronoi
Undertake a voronoi using the health facilities.
Work out the number of people each Health facility needs to Accommodate based on straight line
distance. (Join Attributes by location)
Determine malaria points without access to Facilities
Use the Health facilities buffer to select the malaria cases which are not within reach of a health facility.
(points in polygon + Invert selection)
Determine Points at Risk
Mosquitoes need water to breed. Therefore select all remaining points within 500m of a river. (Buffer
and points within polygon)
Determine Prevalence
Map the points thematically to see which have the4 highest prevalence
Limited Access
We return to the issue of accessibility. We are looking at targeting interventions where it is most
needed. If a malaria point is in excess of 500m from a road, they have a more difficult time accessing
health facilities and travel. Therefore any of the remaining points outside 500m of a road is a target.
(Buffer, Point in polygon)
Determine what you think is the most needy Area in terms of aid.
Which points are left Based on prevalence where which point/s should you target with aid
Extra input
Buffer the Malaria layer with the 2005 Population. Those areas that have overlapping Buffers have a
potentially higher population. Does this impact on your decision
Undertake an interpolation to see if you can verify your Choice visually
QGIS for Malaria Page 66