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Mathematics and Statistics Skills

Using GIS and geo-spatial data

  • 3 things to know
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Overview

Geographical information systems and geo-spatial data, layers and flood risk, interactive and online flood maps, satellite data, describing the pattern on a digital risk map, the main limitation of such systems, and using them to plan new housing.

What you need to know

Answer each one before you reveal it.

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Key term

What kind of information do satellites supply to a geographical information system (GIS)?

Key term

What is a geographical information system?

Key term

What makes a set of data geo-spatial?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is a geographical information system?

    Model answer

    A computer system that stores, displays and analyses information tied to locations, so several sets of data can be mapped together.

  2. 2

    What makes a set of data geo-spatial?

    Model answer

    Every value in it is attached to a place, usually by coordinates, so it can be positioned accurately on a map.

  3. 3

    How is the information in such a system organised on screen?

    Model answer

    In layers, each holding one kind of information, which can be switched on or off and viewed on top of one another.

  4. 4

    Why are layers so useful when investigating the risk of flooding?

    Model answer

    A layer showing land liable to flood can be placed over a layer of houses and roads, revealing exactly which properties would be affected.

  5. 5

    What can a user do with an interactive map that a printed one does not allow?

    Model answer

    Zoom in and out, turn layers on and off, and click on a feature to read the figures behind it, rather than seeing one fixed view.

  6. 6

    How might somebody buying a house use an online flood map?

    Model answer

    To check whether the property falls inside an area marked as at risk, and how likely flooding there is judged to be.

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