Geographic Restrictions
Some documents have precise geographic data in form of GPS measured coordinates provided by the source.
For other documents this data is based on source metadata, with a certain precision level.
These levels (ordered from lowest precision to highest) are: country, region and city (extracted data) and coordinates (exact data).
The coordinates for lower precision geographic data are equal to their capital.
Geographic restrictions exist for:
- sourcegeo: location of the source of the articles (e.g. a page, a site, a publication).
- authorgeo: general location of the author of the article.
- articlegeo: location where the article was written.
| Restriction | Description | Example |
|---|---|---|
sourcegeo, articlegeo, authorgeo | Restricts the results to a geographic area defined either by coordinates (latitude,longitude) of the upper left and lower right corner or by a geo id | sourcegeo:50.3,5.7;49.4,6.5 sourcegeo:berlin_de |
sourcegeo_resolution, articlegeo_resolution, authorgeo_resolution | Restricts to documents that have a minimum precision level of location data. Possible levels are coordinates, city, region and country. default: all documents | sourcegeo_resolution:coordinates |
sourcegeo_accuracy, articlegeo_accuracy, authorgeo_accuracy | Restricts to documents that have a specific geo detection accuracy. Options are exact, high, medium or low | sourcegeo_accuracy:lowsourcegeo_accuracy:high |
Example
Search for documents that are in a box that roughly corresponds to Luxembourg and have exact coordinates.
Luxembourg's north end is at around 50.3°, south is at 49.4°, west at 5.7° and east at 6.5°, the upper left corner is 50.3,5.7 the lower right corner is 49.4,6.5.
The final query is:
sourcegeo:50.3,5.7;49.4,6.5 AND sourcegeo_resolution:coordinates