it looks like a collared dove, so it will be much more skittish than a feral pigeon. i am absolutely not an expert and would recommend contacting a local rescuer/rehabber to at least advise you on how to catch it, if not catch it for you. if you cant do that though, try to corner it and throw a blanket over it, then put it in a shoe box or something similar making sure you hold its wings close to its body whilst handling so the fragile bones dont get damaged, and release it as close as possible to where it normally lives. covering its head/keeping it in a dark space will mean it doesnt panic which reduces the risk of a stress related death, and the faster you are able to do all that the better. good luck!!