Hello! I'm preparing some small maps for my public-domain book. Those maps are PNGs rendered from heavily edited (with Inkscape) OpenStreetMap data. Can I put my PNGs into public domain or I need to license them with CC-BY-SA?

Hello! I'm preparing some small maps for my public-domain book. Those maps are PNGs rendered from heavily edited (with Inkscape) OpenStreetMap data. Can I put my PNGs into public domain or I need to license them with CC-BY-SA?