Put the source to work.
See which travel sources might help answer your question together. The catalog describes proposed connections and the checks still needed before those sources can support a combined result.
Why it matters
Useful data needs the right connection. A field with a similar name may describe a note, a place, or an observation, and those are not interchangeable.
Which sources can you connect without changing their meaning?
Imagine a briefing needs air traffic, visitor spending, and destination facts together. The files use different names, periods, and geographic keys. A connection plan helps you check the joins. It explains what might fit together before a combined number is shown.
This catalog records four source databases and proposed connections. Its tests remain unresolved, so it cannot yet describe travel flows. Use the tourism source guides to choose the evidence you need. Check observations separately from footnotes and preserve the survey or traffic universe each table describes.
Three steps you can take
- Start with one reader question and list the specific measures needed to answer it.
- Confirm shared geography, periods, units, and join keys before combining rows.
- Check totals before and after a join to detect duplication or missing coverage.
Read the source: National Data System: data infrastructure. This reference explains the source or research context; the inventory figures below come from the reviewed NDS package.
Know what you are looking at.
- Source databases documented
- 4
- Connection tests
- 4 untested
- Observed automatic selection
- WDI footnotes selected instead of observations
Use these figures to understand the package reviewed on October 20, 2026. The results section below tells you which comparisons you can explore here and which still need source work. A source guide is different from a complete table of published observations.
How to use the evidence
Resolve the source-to-target field mappings before testing a connection.
Use observation tables for measure values and attach footnotes as context rather than treating notes as observations.
Available results and rankings
- The reviewed catalog identifies proposed integration paths and unresolved mappings.
Coverage and limits
- No travel-flow ranking is established by this integration audit.
- All four connection tests remain untested in the reviewed copy.
Other source guides
Commercial Diplomacy Index™ · National Data System · Source and method guide · October 20, 2026