How do I create giant game map?

hi in my game (for Android devices) i would like to create a map for all the levels, like in candy crush.

My game résolution is 1080x1920, do i have to create the map in the same size but bigger in height??

because the picture is going to be really heavy

here its an example of what i need

http://vignette2.wikia.nocookie.net/candy-crush-saga/images/f/f8/World_6.jpg/revision/latest?cb=20160623022629

can someone help?

i still need advices on this problem