Find public data for a specific question
Search a data catalogue by producer, place and period, then inspect the dataset record before download.
Follow the method ↓
The answer in 30 seconds
An open data portal helps discover files, but a search result can be out of date, use a different geographic unit or link to a resource whose format does not fit your task.
Define the measure, geography and period first. Search a relevant official catalogue, read the dataset record and documentation, and download only a resource whose scope and licence meet the question.
Examples to adapt
Check whether the dataset describes stops, trips or punctuality, and the exact area covered.
Look for changes in definitions before comparing years.
Confirm coordinates, units and the most recent update before plotting points.
Follow the method
- 1Specify the need
Write the variable, unit, area, date range and desired level of detail.
- 2Find the producer
Search the responsible body's catalogue or a national data portal rather than a detached mirror.
- 3Read the record
Check producer, publication and update dates, resources, methodology and licence.
- 4Sample the file
Open a small extract and compare column names and values with the documentation.
A checklist to keep
Use these checks to record what you found. The grid supports a decision; it does not make one for you.
| Check | What to examine | Action |
|---|---|---|
| Measure | Does the file contain the required variable? | Check |
| Area | Which places are covered? | Compare |
| Period | When were observations made? | Record |
| Method | Are definitions documented? | Read |
| Licence | What conditions apply? | Confirm |
Free, no sign-up. UTF-8 text with semicolon-separated columns.
What to check
A recent file date does not guarantee recent observations.
The geographical coverage may differ from the catalogue title.
A data record may link to several versions or formats.
Common questions
Is every public dataset open for any use?
No. Read the applicable licence and any restrictions on the specific resource.
What if the needed measure is absent?
Document the gap; do not substitute a nearby measure without explaining the difference.
Sources and documentation
Documentation consulted on . Examples are illustrative; interfaces and results may change.