Practical Manual - Malareo

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You will notice that the layer does NOT appear in the map, however it is available in the TOC. This is because the CRS of the 2 layers are different. Open the metadata tab of each layer and look at the Coordinate Reference System. Make a note of what CRS each layer is using. It is important to get these layers into the same CRS if they are to overlay properly in the map. Use the Zoom Full button to see where these layers are sitting. Right click and select Set Layer CRS from the context menu. Specify the CRS as WGS84. Click OK. You will see that the Fire_Stations layer has moved. You can now see the difference in position of the layers. Remembering that the default CRS of the project is WGS84 and along with the fact that the eThekwini layer now has a CRS of WGS84, we need to change the CRS of Fire_Stations to match that of eThekwini. Select the Fire_Stations layer. If you use the Zoom Full button again you will notice that the layers are now overlaying nicely. However of you look at the scale bar, you will notice that it reads 40000 degrees in length. This is obviously not correct. To get the correct scale it is necessary to move the project and layers into the Cape/UTM Zone 36S projection. First Set the CRS of each layer to Cape/UTM Zone 36S Finally chance the CRS of the project to Cape/UTM Zone 36S. Zoom to the extent of one of the layers. You will notice that the scale bar now reads 40km. This is an accurate scale. QGIS for Malaria Page 34
<strong>Practical</strong> 5 Tabular Data Queries Outline Attribute Tables Viewing Attribute Information Working with Attribute Tables Selecting Records Selecting Multiple Records Switching and Clearing Your Selection Basic Statistics Querying Data in Attribute Tables Search Advanced Search INTRODUCTION GIS data has two components: 1. Spatial (geographic) data which can be viewed as points, lines or polygons on a map. Points Lines Polygons QGIS for Malaria Page 35
Page 1 and 2: Introduction to Geographic Informat
Page 3 and 4: occurrences you can gain a better u
Page 5 and 6: Once in the folder, using your mous
Page 7 and 8: Map Legend You now have 2 layers lo
Page 9 and 10: 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: Task 1: Changing the Default CRS in
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 and 62: updated with percentages of prevale
Page 63 and 64: Click on Set to current extent Leav
Page 65 and 66: Practical 8 Summary Practical Outli

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