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					                             Republic of Zambia
                              Ministry of Health

Indoor Residual Spraying (IRS) GIS
 Training and Spray Area Mapping

                      Basics of GIS

    Training Workshop: 29 February–3 March 2008, Chipata, Zambia
Geographic Information System (GIS)

  A GIS is an organized collection of
  hardware, software, geographic data,
  personnel, and procedures designed to
  efficiently capture, store, update,
  manipulate, analyze, and display all forms
  of geographically referenced information.
Uses of GIS
Answer questions such as:
    Location
        What is at…?
        What is this location?
        Location can be described as an address,
    Condition
        Where is it?
        Where can poor soils be found?
    Trends
        What has changed since…?
        Compare changes over time
Uses of GIS, cont.
Answer questions such as:
    Patterns
        What spatial patterns exist?
        How many people live within 5km of a river?
    Modeling
        What if…?
        What happens to the water supply if a new road is built
         in a certain location?
How data are stored in a GIS
   Point
        Describes a feature associated with a single
         location in space, such as a household
   Lines
        Describes feature’s location by a string of
         spatial coordinates, such as a road or stream.
   Areas
        Describes feature by a closed string of spatial
         coordinates – polygon
What type of analysis can GIS do?
   Overlays
       Update an IRS district map
       Find out how many households have been
   Nearest Neighbor
       Locate the addresses of the owners of the land
        next to the river, road, or swamp
   Network Analysis
       Locate the shortest route between the health
        facility and the road
   Is NOT just a map-making tool

   Does not store maps but objects which can
    be used to construct maps (layers of points,
    lines, polygons)

   Won’t make your decisions for you (you are
    still in charge)

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