Practical Manual - Malareo

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These include: Menus such as: File, Edit, View, Layer and Settings amongst others and allow you to interact with the data and the program components. (These have drop down lists of all the tools and options available to you for use within QGIS). Toolbars contain shortcuts to selected icons representing many of the tools or options within the menus. (These allow one click access to the tool or option rather than having to search in the menus). The Status bar provides information on your map display and map layers, such as longitude and latitude (This helps you pinpoint locations and gives you information on the projection of the layers.) The Map Legend or table of contents (TOC) is where map layers are loaded and can be selected, and moved relative to one another in order (Layers are visible from top to bottom as if looking through a series of clear transparencies.) The Map view or Canvas is where the spatial data is viewed, essentially allowing you to view the map you are creating using the map layers in the map legend. (This is where you examine the map layers and change how they are represented to better express what you are attempting to show to the map reader.) Exercise 1. Opening a project Data can be added as individual layers to the map legend to make up a map. These layers can be manipulated (colors changed, line thicknesses altered) to create a map you wish to print or display. Once this is done the Map project can be saved. This saves all the settings used in the map. As a result you can open existing Map Projects. Open the Project called Africa. To do this left click on the Menu called File and select Open Project. Click on the drop down button to the right of the look in box and select navigate to the folder called malereo on your Local C drive (C:\malereo) folder. QGIS for Malaria Page 4
Once in the folder, using your mouse select (by left clicking on) the Africa.qgs project and click on open. This will open a thematic map (A map showing one attribute) of Africa Showing the number of cases of Malaria per 100 000 people in each country in 2008 (WHO). Notice the Number of cases is assigned into classes to visually represent the severity of malaria cases. The QGIS window can be resized. To do this left click on the Maximize button in the top right of the QGIS Window. This expands the window to the maximum size of the screen and locks it in place. Menus There are 9 dropdown menus within QGIS, these allow you to interface with the software and the layers you have open. Exercise 2 Using menus Open the View Menu and select Zoom In. Using your mouse select a point to the south west of Libya, holding the mouse button down drag down to northern Mozambique. (A box will form showing the extent of your zoom and when you release it will zoom to the new extents. From the same menu select the identify item. Click on a number of the Countries, one at a time. Notice a identify results window pops up and relays information about each country. This is known as attribute information and is stored within the shapefile of the layer you are working with. In this case there is Country, Cases, Cases_km and Shape_Area. This is a major strength of GIS as you can query using both Spatial and attribute information. Within the View menu select Show bookmarks and select the Southern Africa bookmark. This “zooms” the Map view to the extents of Southern Africa. You can create your own book marks which make it easy to return to an area of interest while working with a map. Familiarize yourself with the menus and their contents, by opening each menu and scrolling down the menu. The file menu allows you to open and save projects and to print. The edit menu allows you to edit layers and features within layers QGIS for Malaria Page 5
Page 1 and 2: Introduction to Geographic Informat
Page 3: occurrences you can gain a better u
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 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
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Active Layers in the TOC Mathematic
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In this practical you will undertak
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1999 (which was year 1 of the 10 ye
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updated with percentages of prevale
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Click on Set to current extent Leav
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Practical 8 Summary Practical Outli
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