Creating multi band raster from one GeoTiff

I'm using AgiSoft photoscan to create a photo mosaic from aerial images. The images are being captured using a camera modified for NIR and RGB data capture.

I want to be able to perform spectral mixture analysis on the image using a package like ENVI but am unsure where to start or if this is even possible.

I assume that I would need to first create a mutli band raster from the single exported ortho GeoTIFF from Agisoft Photoscan. But even this I'm not sure about. Can anyone point me in the right direction please?

ENVI can handle this directly. there is a layer stacking tool (Basic Tools > Layer Stacking) to create composite bands.

Watch the video: Murat Temiz - CRLBs Informed Waveform Selection in Multiband Multistatic Hybrid Radar Networks (October 2021).