Using Maps from Physical Books on Roll20

I have just discovered Roll20 and its tools and it is exactly what I am looking for! My group use to play in person but with scheduling we play when we are all around (rare) so this was amazing to find! I own several modules in the physical copies, from adventure to the DMG, PHB, and MM.  While I liked creating copies of the maps for my group to see, I saw that I can upload my own pictures here.  Question is: Is it OK for me to add photos of maps from the physical books onto my game here? I do not want to cross any copyright lines or things of that nature. I see there are map packs and books here but if i already own the material why pay double?  I mean worst case is I draw them out but, just simplicity, I rather be safe than sorry.  Thank you! 

Making copies of physical products you own for personal use falls within fair use for those products. Sharing those copies with anyone is a violation of copyright. ( not including the sharing you do by inviting players to your game, that's totally fine and also fair use.)