Since I didn’t find any references to AW3D30 digital surface model in OSM Wiki, I decided to create a new page for it.

Briefly speaking, since JAXA license requires attribution for derivative products, it doesn’t seem like it’s possible to use these data to update OSM database, but it’s still possible to mix AW3D30 data with OSM data in third-party products.

Visual comparison between SRTM 1-arcsecond (source: NASA), upper half, and AW3D30 (source: JAXA), lower half: (Click on image for full resolution)