Practical Manual - Malareo

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<strong>Practical</strong> 1 Introduction to QGIS Outline Introduction Interface Menus Toolbars Map legend Map view Zoom/Pan/Bookmark Layers Adding Removing Visibility Viewing Saving Moving Types Points Lines Polygons Rasters INTRODUCTION This course assumes you have a basic working knowledge of computers and you know how to use Microsoft Windows and associated office software. It also requires a school level understanding of maps and mapping. In other words how to read a map and understand the concept of symbols representing points, lines and areas. There are basic mathematical operations such as basic Boolean logic and concepts required such as relative percentages. These are all required to effectively use GIS as a tool. GIS (Geographic Information System) is suited to epidemiology and mapping malaria as it allows you to map individual cases on a map where it was contracted. By mapping where the cases occur you can target the most affected areas appropriately and place resources where they are needed. By analyzing QGIS for Malaria Page 2
occurrences you can gain a better understanding of the spread of the sickness over time, such as when cases occur, are they linked to a particular event, such as a wet period QGIS is a desktop GIS, so named as it can be run on any desktop PC (Personal Computer). QGIS allows you to view, edit, analyze and output map or geographic (spatial) data. It uses amongst others, vector shape files (so called as the files have a .shp extension in the name) and raster layers to do this. Map layers (shape files) are loaded into the map legend one above the other and viewed in the map View / Display. There is a QGIS user manual which is also included in your root directory should you wish to delve deeper into the nitty grittys of QGIS. QGIS INTERFACE QGIS is opened by selecting it from the start menu in Windows, usually bottom left of your screen. Like most windows based programs it has its own window that can be minimized moved around or maximized on the screen. QGIS has a number of components that make up the program. QGIS for Malaria Page 3
Page 1: Introduction to Geographic Informat
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 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
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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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