Some ADS-B data points:
https://tar1090.adsbexchange.com/?ic...-01-26&zoom=15
Press K for labels. The labels show ground speed, uncorrected barometric altitude and a timestamp.
Add 225 ft to get the approximate altitude above mean sea level. (250 ft might be more accurate but that's more theoretical)
Attached a KML file with the altitudes corrected by 225 ft and converted to meter as per KML standard.
You'll have to remove the .doc ending, the forum didn't want a KML file.
The KML file can be viewed for example on
http://earth.google.com/
The screenshot from the FR24 data a couple of posts before has more points, still thought i'd post a different data source for those curious.