{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"VerticalCRS","name":"El Hierro height","datum":{"type":"VerticalReferenceFrame","name":"El Hierro"},"coordinate_system":{"subtype":"vertical","axis":[{"name":"Gravity-related height","abbreviation":"H","direction":"up","unit":"metre"}]},"scope":"Geodesy, engineering survey, topographic mapping.","area":"Spain - Canary Islands - El Hierro onshore.","bbox":{"south_latitude":27.58,"west_longitude":-18.22,"north_latitude":27.9,"east_longitude":-17.83},"id":{"authority":"EPSG","code":9401}}