How to get the upperLimit and lowerLimit value in mapbox studio?

[shengyue gong]

Hi,I want to make an aviation map by using mapbox and the airspace geojson files.

And i noticed that there is upperLimit and lowerLimit infomation on your map.But when i uploaded the geojson on mapbox and select the data,the upperLimit value is in a object.I want to know what expression should i write to get the number in upperlimit features.Thank you!

[openaip net]

The altitude object contains a value, the unit and the reference datum. The unit and reference datum are enums. You can find the enum values in the API docs for the core API. Click "schema" in the  above the response example. You must manually stringify the object in your style.

Cheers,

Stephan