Practical Manual - Malareo

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graduated display of them. Undertake a graduated Jenks 5 class thematic classification of the 1999 malaria figures. What differences can you see between this and the previous classification Interpolation QGIS has the option of interpolating to a raster surface from a series of points. It offers 2 options (TIN) Triangular Irregular Network which uses a series of triangles to link points. And (IDW) Inverse Distance Weighting which uses the principle that influence of a point decreases as you move away from it. You will undertake a IDW interpolation. First you will load the KZN boundary file. Right click on the KZN layer and Zoom to Extents (This will ensure that the Interpolation covers a large enough area. Next you will open the interpolation tool from within the Plugins Drop Down menu. This opens the interpolation Plugin window. Change your input layer to: malaria_case-Health_facility Select Prevalence as your interpolation Attribute And add it to the Input layer by selecting Add Change the Interpolation method to IDW QGIS for Malaria Page 62
Click on Set to current extent Leave the other options as default Save the output file as Prevalence. This will result in a rater layer being generated. You will initially see it as a standard grey rectangle. To View the interpolation open the properties window for prevalence and change the Color map to Pseudocolor. Turn on standard deviation and set it to 2 and Click ok QGIS for Malaria Page 63
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Introduction to Geographic Informat
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occurrences you can gain a better u
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Once in the folder, using your mous
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Map Legend You now have 2 layers lo
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Select the Identify features tool a
Page 11 and 12: 30% release it and click on Apply a
Page 13 and 14: It is important to note that althou
Page 15 and 16: Open your Identify features and exa
Page 17 and 18: Acquiring Spatial Data There are nu
Page 19 and 20: This adds the shapefile to the lege
Page 21 and 22: You will be creating a layer using
Page 23 and 24: This opens a co-ordinate reference
Page 25 and 26: Next you will create a line layer (
Page 27 and 28: Continue digitising the other roads
Page 29 and 30: If you are interested in seeing the
Page 31 and 32: PROJECT COORDINATE REFERENCE SYSTEM
Page 33 and 34: Task 1: Changing the Default CRS in
Page 35 and 36: Practical 5 Tabular Data Queries Ou
Page 37 and 38: ecords. Switching and clearing yo
Page 39 and 40: Practical 6 Spatial Analysis Outlin
Page 41 and 42: Task 1: Open a new QGIS project. A
Page 43 and 44: In order to make measurements in un
Page 45 and 46: Now to measure along the length of
Page 47 and 48: Buffer and Dissolve Buffer: Often i
Page 49 and 50: Open the Attribute Table for the Pr
Page 51 and 52: The result window shows the number
Page 53 and 54: Task 5: Slope Analysis Open a new
Page 55 and 56: Active Layers in the TOC Mathematic
Page 57 and 58: In this practical you will undertak
Page 59 and 60: 1999 (which was year 1 of the 10 ye
Page 61: updated with percentages of prevale
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Practical Manual - Malareo

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