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Improve docs on spatial reference requirements (#14422)

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Thomas Neirynck 2017-10-11 15:33:21 -04:00
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docs/setup/settings.asciidoc
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@ -79,7 +79,7 @@ The minimum value is 100.
[[regionmap-settings]] `regionmap`:: Specifies additional vector layers for use in <<regionmap, Region Map>> visualizations.
Each layer object points to an external vector file that contains a geojson FeatureCollection.
The file must use the WGS84 coordinate reference system and only include polygons.
The file must use the [WGS84 coordinate reference system](https://en.wikipedia.org/wiki/World_Geodetic_System) and only include polygons.
If the file is hosted on a separate domain from Kibana, the server needs to be CORS-enabled so Kibana can download the file.
The url field also serves as a unique identifier for the file.
Each layer can contain multiple fields to indicate what properties from the geojson features you want to expose.