I am working registration of multispectral and SAR images. Multispectral imagery is a level 2 orthorectified imagery and SAR imagery is a level 2 georeferenced image. The spatial resolution of orthorectified SAR imagery is 36m whereas the resolution of the multispectral image is 56m. Please guide me about which image should be considered as a reference for registration (whether SAR or multispectral image)?
Maybe you could mention exactly which sensors on which platforms and what level of processing and some idea of the acquisition dates. And maybe some idea of the terrain you are looking at. 'orthorectification' quality can vary quite a bit, and sometimes in mountainous regions, no amount of rectification is going to correct layover shadows in a single image. Depending if you have to do any resampling anyways to get registered images for analysis, in this case resolution doesn't matter as much as whichever has the highest contrast for features that support alignment ( conjecture, since little is known ).
the refrence is the high resolution image SAR 36M
Then coregistration between the two images
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