GIS Geographical information systems

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Geographical skills
GIS Geographical information system
GIS is a computer tool used for storing, organising, displaying and analysing
geographical information. It allows data to be located to any spot on the earth's
surface. It can be used for things such as field samples, aerial photography, land
surveying, GPS, population census and administrative records.
Advantages
Can cope with large amounts of data
Can cope with wide variety of data
Can cover large study areas
Can change scale of an area
Dynamic so can cope with frequent changes
Easier to keep up to date so findings are current
Fast and efficient
Avoid political boundaries and other practical boundaries to research
GIS can be used in geographical investigations:
Stage 3 collecting and recording data: can be used in the field to measure
and record information as it can be linked to a specific point. E.g. weather
monitors can collect information and transfer them to GIS. Also used to
measure distances in a straight line more accurately than on a map.
Secondary data can be accessed from several sites through GIS.
Stage 4 analysing and interpreting data: allows you to ask questions such as
"where is?" and "what if?" Possible to measure distances between locations
hence giving exact measurements. Raster analysis: GIS can store data as a
grid.

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