| Aim of the method/technique |
The population pyramid is used to study the structure of a population according to sex and age of the inhabitants. Population pyramids constructed for several years help compare the changes in the demographic structure over time. |
| Scale – spatial and temporal |
Population pyramids can be constructed using data from various territorial levels (from local to the national level) and for various years.
|
| Brief description |
A population pyramid, also called an age-sex diagram, is a graphical illustration that shows the distribution of various age groups distinguished by sex (typically that of a country or region of the world), which ideally forms the shape of a pyramid when the region is ‘healthy’. It typically consists of two back-to-back bar graphs, with the population plotted on the X-axis and age on the Y-axis, one showing the number of males and one showing females in a particular population in five-year age groups (also called cohorts). Males are conventionally shown on the left and females on the right, and they may be measured by raw number or as a percentage of the total population. |
| Data requirements |
To construct population pyramids population data categorized by sex and age is required for the study area. |
| Main applications in cropland, grazingland and forests & shrubland regions |
---
|
| Strengths and weaknesses |
---
|
