Data Presentation (Cambridge (CIE) IGCSE Geography)

Revision Note

Bridgette Barrett

Written by: Bridgette Barrett

Reviewed by: Jenna Quinn

Data Presentation

  • There are different types of data

    • Quantitative and qualitative

    • Continuous and discrete

  • There are many ways in which data can be presented

    • Graphs

    • Annotated photographs

    • Field sketches 

    • Maps

    • Diagrams

  • The types of data presentation used will depend on the data collected

Graphical skills

  • Much of the data collected will be presented in the form of graphs of some form

    • Each type of graph is suitable for particular data sets

    • The graphs also may have advantages and disadvantages

Bar graphs 

  • One of the simplest methods to display discrete data 

  • Bar graphs are useful for:

    • Comparing classes or groups of data

    • Changes over time

Strengths

Limitations

Summarises a large set of data 

Requires additional information

Easy to interpret and construct

Does not show causes, effects or patterns

Shows trends clearly

Can only be used with discrete data

bar-graph

Compound or divided bar chart

  • The bars are subdivided to show the information with all bars totalling 100%

  • The main use of a divided bar chart is to compare numeric values between levels of a variable such as time

compound-bar-chart

Population pyramid

  • A type of histogram

  • Used to show the age-sex of a population

  • Can be used to show the structure of an area/country

  • Patterns are easy to identify

population-pyramid

Line graphs 

  • One of the simplest ways to display continuous data

  • Both axes are numerical and continuous 

  • Used to show changes over time or space

Strengths

Limitations

Shows trends and patterns clearly

Does not show causes or effects

Quicker and easier to construct than a bar graph

Can be misleading if the scales on the axis are altered

Easy to interpret

If there are multiple lines on a graph it can be confusing

Requires little written explanation

 

  • A river cross-section is a particular form of line graph because it is not continuous data but the plots can be joined to show the shape of the river channel

line-graph

Pie chart

  • Used to show proportions, the area of the circle segment represents the proportion

  • A pie chart can also be drawn as a proportional circle 

  • Pie charts can be located on maps to show variations at different sample sites

Strengths 

Limitations

Clearly shows the proportion of the whole

Do not show changes over time

Easy to compare different components

Difficult to understand without clear labelling

Easy to label

Hard to compare two sets of data

Information can be highlighted by separating segments

Can only use for a small number of categories otherwise lots of segments become confusing

pie-chart
Pie Chart Showing Energy Sources in an Area

Rose diagrams

  • Use multidirectional axes to plot data with bars

  • Compass points are used for the axis direction

  • Can be used for data such as wind direction, noise or light levels

rose-diagram
Wind Direction Shown on a Rose Diagram

Triangular graphs

  • Have axes on three sides all of which go from 0-100

  • Used to display data which can be divided into three

  • The data must be in percentages 

  • Can be used to plot data such as soil content, employment in economic activities

triangular-graph

Scatter graph

  • Points should not be connected

  • The best fit line can be added to show the relations

  • Used to show the relationship between two variables

    • In a river study, they are used to show the relationship between different river characteristics such as the relationship between the width and depth of the river channel

Strengths

Limitations

Clearly shows data correlation

Data points cannot be labeled

Shows the spread of data

Too many data points can make it difficult to read

Makes it easy to identify anomalies and outliers

Can only show the relationship between two sets of data

scattergraph

Examiner Tips and Tricks

In the exam, you will not be asked to draw an entire graph. However, it is common to be asked to complete an unfinished graph using the data provided. You may also be asked to identify anomalous results or to draw the best fit line on a scattergraph.

  • Take your time to ensure that you have marked the data on the graph accurately

  • Use the same style as the data which has already been put on the graph

    • Bars on a bar graph should be the same width

    • If the dots on a graph are connected by a line you should do the same

Choropleth map

  • Maps which are shaded according to a pre-arranged key

  • Each shade represents a range of values

  • It is common for one colour in different shades to be used

  • Can be used for a range of data such as annual precipitation, population density, income levels, etc...

Strengths

Limitations

The clear visual impression of the changes over space

Makes it seem as if there is an abrupt change in the boundary

Shows a large amount of data

Distinguishing between shades can be difficult

Groupings are flexible 

Variations within the value set are not visible

choropleth-map

Proportional symbols map

  • The symbols on the map are drawn in proportion to the variable represented

  • Usually, a circle or square is used but it could be an image

  • Can be used to show a range of data, for example, population, wind farms and electricity they generate, traffic or pedestrian flows

Strengths

Limitations

Illustrates the differences between many places

Not easy to calculate the actual value

Easy to read

Time-consuming to construct

Data is specific to particular locations

Positioning on a map may be difficult, particularly with larger symbols

proportional-circle-map
Proportional Circles Map Showing GDP (Billion US$) across Europe

Examiner Tips and Tricks

In the exam, you may be asked why a particular graphical technique is appropriate. You should ensure that you know the advantages and disadvantages of the different data presentation methods.

Photographs 

  • Photographs can be taken to show different aspects of sample sites 

  • These can be annotated as part of the fieldwork analysis

Strengths

Limitations

An accurate record at the time

Not all photographs are relevant

Can represent things more clearly than numerical data

Can be subjective and biased as student selects what is photographed

Can be used to show data collection techniques

Photographs sometimes contain too much information

Can be used next to historical photographs to show changes over time

They are two dimensional so judging depth is difficult

Helps recall key features

 

Field sketches

  • Should include location/site number, title and compass direction

  • Includes the key features at a site 

Strengths

Limitations

Things can be left out of the sketch if they are not relevant to the enquiry

The scale in the sketch may be inaccurate

Smaller important areas can be more detailed

Important details may be missed

Gives a broad overview of the features

The sketch may contain inaccuracies which affect the analysis for example more litter than there actually was at the site

Helps recall of key features

 

Maps

  • An essential part of any fieldwork enquiry is to show the location of features and sample sites

  • Maps can also be used to show relevant features such as amenities around the sample sites

Strengths

Limitations

Size and scale of features/site can be accurately measured

The map may be out of date

Key to show features around the sample sites

Maps cannot show changes over time

Allows distribution of features to be shown accurately

Bias may be introduced by highlighting certain features

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Bridgette Barrett

Author: Bridgette Barrett

Expertise: Geography Lead

After graduating with a degree in Geography, Bridgette completed a PGCE over 25 years ago. She later gained an MA Learning, Technology and Education from the University of Nottingham focussing on online learning. At a time when the study of geography has never been more important, Bridgette is passionate about creating content which supports students in achieving their potential in geography and builds their confidence.

Jenna Quinn

Author: Jenna Quinn

Expertise: Head of New Subjects

Jenna studied at Cardiff University before training to become a science teacher at the University of Bath specialising in Biology (although she loves teaching all three sciences at GCSE level!). Teaching is her passion, and with 10 years experience teaching across a wide range of specifications – from GCSE and A Level Biology in the UK to IGCSE and IB Biology internationally – she knows what is required to pass those Biology exams.