Edexcel GCSE Geography B (1GB0) — Geographical Investigations
Before you even step outside to count pedestrians or measure river pebbles, your investigation has already begun. Secondary data is information that has been collected by someone else, such as a government agency or a research group, which you then use to support your own fieldwork. It is a mandatory component of the route to enquiry because it provides vital context that you cannot gather in a single day. While primary data is highly specific and completely under your control, secondary sources often cover much larger areas and longer timeframes, making them essential for identifying representative sample sites.
How do you know if the 50 people you surveyed on a high street truly represent the whole town? In the UK, the Office for National Statistics (ONS) conducts a statutory national survey every ten years called the census. This provides a highly detailed demographic snapshot of the population's socio-economic data, which can be accessed via official platforms like Nomis. Students use this information as a baseline—a reliable starting point to check if their primary fieldwork data is representative.
For example, if your primary questionnaire suggests that 45% of a ward's population is retired, you can check this against the official census baseline for that specific ward. If the census states that only 15% of the area is retired, your primary sample might be biased and unrepresentative. Census platforms provide critical demographics down to very small geographic areas (like LSOAs), including age structures, ethnicity breakdowns, and employment levels across different economic sectors.
Census data also provides total population counts, which are used to calculate population density. This is frequently used to justify the choice of contrasting fieldwork sites, such as comparing a highly populated urban core to a sparsely populated rural periphery.
A student is investigating housing quality in a specific city ward. The census states the ward has a total population of 15,000 people and covers a land area of 3 km². Calculate the population density of the ward.
Step 1: Identify the key values from the census.
Step 2: Substitute these values into the formula.
Step 3: Calculate the final answer with units.
A dry, sunny day during a river field trip tells you nothing about what happens during a severe winter storm. To gain long-term temporal context, students can use Environment Agency (EA) flood maps as an additional secondary source. These maps use quantitative data to categorise land into three distinct flood probability zones, ranging from Flood Zone 1 (low probability) to Flood Zone 3 (high probability).
By consulting EA maps, you can identify "invisible management" strategies like underground storage tanks or removable floodwalls that you might miss while walking the site. However, a key negative feature of these maps is that they do not always accurately reflect local surface water flooding caused by temporary drain blockages.
Comparing a modern coastline to an old photograph is like travelling back in time to watch erosion happen. Historical OS maps and photographs act as excellent sources of qualitative data, allowing you to track spatial changes over time. In coastal investigations, comparing old cliff lines on a historical 1:25,000 map with modern digital maps lets you calculate long-term recession rates.
Students often use a method called re-photography, taking a primary photograph from the exact spot a historical photo was taken to spot differences in environmental quality. When adding an annotation to these images in your write-up, you must provide a detailed explanatory point rather than just a simple label. Be critically aware that photographs can be subjective, often ignoring areas of deprivation to only show the most attractive parts of a town.
Staring at a massive spreadsheet of river depths and pebble sizes rarely reveals the full geographical story. Geographic Information Systems (GIS) are digital platforms, like Digimap or ArcGIS, used to capture, store, and display geographical data. GIS adds massive value to an investigation by allowing you to overlay your primary fieldwork results onto secondary data layers.
For example, you could create a proportional circle map showing your primary river discharge measurements, and overlay this onto a secondary British Geological Survey (BGS) bedrock map. This integration reveals clear spatial patterns, providing an explanatory mechanism for why certain river sections erode significantly faster than others.
Students often confuse labels with annotations on photographs; an annotation must explain why a feature is there or how it has changed, not just name it.
In 8-mark fieldwork questions, examiners expect you to explain exactly how secondary data was used, rather than just listing sources (e.g., 'Census data was used as a baseline so it could be compared with primary questionnaire results').
When evaluating the reliability of secondary sources like Environment Agency flood maps, always mention a limitation, such as the fact that they may not account for local surface water flooding caused by blocked drains.
Remember that a major benefit of secondary sources like Met Office climate data or historical maps is providing temporal context, which proves whether the day you collected your primary data was 'typical' or an anomaly.
Secondary data
Information that has been collected by someone else (e.g., the ONS or Environment Agency) and is used by the researcher to support their investigation.
Office for National Statistics (ONS)
The lead organisation in the UK responsible for collecting and publishing official census data.
Census
A statutory national survey of the population conducted every 10 years to provide a detailed picture of the socio-economic and demographic characteristics of the UK.
Socio-economic data
Information relating to the interaction of social and economic factors, such as employment levels, income, and housing quality.
Baseline
A set of initial data used as a starting point to compare other data against, allowing researchers to measure change over time or check reliability.
Demographics
Statistical data relating to the population and particular groups within it, such as age structure and ethnicity.
Environment Agency
A UK government body responsible for protecting and improving the environment, which provides secondary data such as flood risk maps.
Quantitative data
Information that can be measured and expressed numerically, such as population counts or river discharge levels.
Qualitative data
Information that is descriptive and non-numerical, such as historical photographs or field sketches.
Annotation
A label added to a photograph or map that includes a detailed description or an explanatory point, rather than just a simple name.
Geographic Information Systems (GIS)
A digital system for capturing, storing, checking, and displaying data related to positions on Earth's surface, allowing multiple layers of information to be overlaid.
Spatial patterns
The arrangement of geographical phenomena across the Earth's surface, often made visible by overlaying data in GIS.
Put your knowledge into practice — try past paper questions for Geography B
Secondary data
Information that has been collected by someone else (e.g., the ONS or Environment Agency) and is used by the researcher to support their investigation.
Office for National Statistics (ONS)
The lead organisation in the UK responsible for collecting and publishing official census data.
Census
A statutory national survey of the population conducted every 10 years to provide a detailed picture of the socio-economic and demographic characteristics of the UK.
Socio-economic data
Information relating to the interaction of social and economic factors, such as employment levels, income, and housing quality.
Baseline
A set of initial data used as a starting point to compare other data against, allowing researchers to measure change over time or check reliability.
Demographics
Statistical data relating to the population and particular groups within it, such as age structure and ethnicity.
Environment Agency
A UK government body responsible for protecting and improving the environment, which provides secondary data such as flood risk maps.
Quantitative data
Information that can be measured and expressed numerically, such as population counts or river discharge levels.
Qualitative data
Information that is descriptive and non-numerical, such as historical photographs or field sketches.
Annotation
A label added to a photograph or map that includes a detailed description or an explanatory point, rather than just a simple name.
Geographic Information Systems (GIS)
A digital system for capturing, storing, checking, and displaying data related to positions on Earth's surface, allowing multiple layers of information to be overlaid.
Spatial patterns
The arrangement of geographical phenomena across the Earth's surface, often made visible by overlaying data in GIS.
