Registration of sentinel 1A and sentinel 2A imagery

[lveci]

Image Fusion Using Sentinel 1 and Sentinel 2

This is the initial offset selection in the CreateStack. There isn’t orbit information in the Sentinel-2 product so you’ll need to use Geolocation. Follow the advice above by @mengdahl and terrain correct the SAR and use the same map projection with the optical then just use CreateStack with Geolocation for the initial offset and bilinear resampling.