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Introduction to GIS for the Purpose of Practising PGIS

Introduction to GIS for the Purpose of Practising PGIS. Introduction to GIS. By: Jon Corbett and Kasondra White. Unit: M12U01. Introduction. Participatory GIS (PGIS) Documenting, presenting and protecting local knowledge What is a GIS? Representing data Quantum GIS

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Introduction to GIS for the Purpose of Practising PGIS

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  1. Introduction to GIS for the Purpose of Practising PGIS Introduction to GIS By: Jon Corbett and Kasondra White Unit: M12U01

  2. Introduction • Participatory GIS (PGIS) • Documenting, presenting and protecting local knowledge • What is a GIS? • Representing data • Quantum GIS • Participatory mapping and GIS

  3. What is a GIS? • GIS systems: • capture; • store; • analyse; • manage; and • present geographic data.

  4. What is a GIS? • GIS packages work with: • maps; • remote sensing; • land surveying; • aerial photography; • databases; • other tools.

  5. What is a GIS? • GIS applications allow users to: • create queries; • analyse spatial information; • edit data and maps; • present results. • Information can be presented: • in a map; • in a textual form.

  6. What is a GIS? • Geospatial data: • information related to a location that can be expressed using coordinates • GIS can be used for: • creating maps • visualising the relationship between places and events • searching for geospatial associations • analysing geospatial data

  7. Representing data • Kinds of questions that GIS can answer: • What is located at a given point? • What kinds of changes have occurred? • What kinds of patterns exist? • What would happen if some kind of a change were to occur?

  8. Points, lines and polygons • Points • one spot on a map • represent exact locations • Lines • string of points • can be measured for distance • Polygons • enclosed area • defined by often complex boundaries

  9. Data layers • Features are displayed through data layers • Contain thematic data • Layers can be: • turned on or off • placed on top of or below one another • Multiple layers can be open at one time

  10. Quantum GIS • Open source • freely available • supported by a community of programmers and technicians • User-friendly

  11. The graphical user interface (GUI) • Simplifying interactions with software • Uses: • clickable symbols • text • Understanding GUI functions is an important part of learning GIS

  12. The graphical user interface

  13. The toolbar

  14. Participatory mapping and GIS • Does GIS fit with the community’s vision? • Does GIS directly address mapping needs? • Is GIS anti-participatory? • expertise required • may require technicians from outside the community

  15. Participatory mapping and GIS • Practitioners of participatory development should avoid technologies that are: • complex • expensive • time-consuming • May, however, still be useful • “Chauffeur-driven” systems

  16. GPS • Displays points collected through a Global Positioning System (GPS) • Captures coordinates of locations of interest • Points can be uploaded and displayed • Useful for depicting locations or boundaries

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