variables:    double time(obs) ;        time:standard_name = “time”;        time:long_name = "time of measurement" ;        time:units = "days since 1970-01-01 00:00:00" ;    float lon(obs) ;        lon:standard_name = "longitude";        lon:long_name = "longitude of the observation";        lon:units = "degrees_east";    float lat(obs) ;        lat:standard_name = "latitude";        lat:long_name = "latitude of the observation" ;        lat:units = "degrees_north" ;    float alt(obs) ;        alt:long_name = "vertical distance above the surface" ;        alt:standard_name = "height" ;        alt:units = "m";        alt:positive = "up";        alt:axis = "Z";    float humidity(obs) ;        humidity:standard_name = "specific_humidity" ;        humidity:coordinates = "time lat lon alt" ;    float temp(obs) ;        temp:standard_name = "air_temperature" ;        temp:units = "Celsius" ;        temp:coordinates = "time lat lon alt" ; attributes:    :featureType = "point";