1.64 microns is in the middle of the H band, which has the added advantage of being where most adaptive optics systems are optimised. This would help to pick out smaller, more distant, or more crowded SNRs.
it depends on the prefessional parctice you have for observations.you can try to use X-ray,optical, radio data to your spesific SNR. if you do not have any idea and wondering if there exists any SNR please read our paper with M.Vucetic in my publication list,may give you some idea.