I have a WV2 image - both the multispectral and panchromatic images of my AOI. I first applied pan-sharpening to achieve a high spatial and high spectral resolution to my satellite image. Now, I want to orthorectify this pan-sharpened image. What orthorectification workflow should I use? Or which is advisable? Say if I'll use the RPC orthorectification workflow, which RPC should I input - that of the multispectral image, or that of the panchromatic image? Thanks!