Altitude of the Matterhorn is 4478m (!)

[codebastler]

Dear cartographers, I have just linked your terrain layer in an open layers web map and recognized that the altitude of the Matterhorn (Switzerland) is not correct:
Altitude in your map: 3883m
Altitude in Swiss maps: 4478m
Nevertheless I like your map products, especially the watercolor layer!
Best regards from Switzerland
Stephan Wondrak
Cartographer

[almccon]

Thanks for the comment! I'm moving the issue to stamen/terrain-classic#101, because that's where we'll have to make the fix.