How to read the map
Learn what the map colors, category shares, and data coverage figures mean. Use them to compare the available signals across areas.
Content updated · By Bernat Sampera
Start with a city
- Explore cities to find a place. You can search by name or use the country filter.
- Open a city page to see its map and available areas.
- Select an area to read its figures. Use the map key for the current view.
What the percentages show
The figures are IndoEuroMap data: shares of classified online records. The main map shows the share assigned to non-European categories. Local and other European categories do not contribute to that share. Headlines at every level, from area to the Europe overview, also exclude Other. Other stays in the denominator.
For example, 20% means that about one fifth of the classified records are assigned to the displayed non-European categories. It does not mean that 20% of residents belong to those groups.
A record can appear more than once. Some records cannot be classified and are excluded. A category does not establish a person's identity, citizenship, or place of birth.
Read the colors with the key
In the main view, blue indicates a lower non-European category share. The scale moves through teal and ochre to dark red as the share rises. Dark red covers 30% and above, so two areas with that color can have different values.
The color scale is not evenly spaced. Read the displayed percentage to compare the published shares. If you select one category, the map key changes to that category's share and scale.
Light gray means no displayed data. Off-white marks nearby places outside the selected area. A blank or hidden value does not mean zero.
Check data coverage
Where available, the map shows a data coverage score for a country, region, or city. It compares classified records per resident with the same ratio for Barcelona. Barcelona is the 100% reference.
A score of 50% means half the reference number of records per resident. It does not mean that half the residents were studied. A score can exceed 100%. It does not measure classification accuracy.
Compare areas with care
- Records can come from visitors, workers, or residents. Tourist and business areas can have different samples.
- Place selection and the number of records affect which names enter the sample.
- Low-data areas and hidden small categories have less information. Treat them as missing information.
- Collection dates and source coverage differ. The map is not a time series of population change.
Read the methodology for the calculation rules. See data sources and updates for the inputs. If a label, figure, or boundary seems wrong, report an issue.