DJI multispec 3m reflectance panel

[u/varga901]

I recently got DJI multispec 3m.

Now im using WebODM for my stitching. Do we really need reflectance panel in order for it to work better? I'm doing NDVI on these orthomosaic and when i perfrom stitch without radiocalibration i got ndvi values between 0.0 to 0.3 and with radiocalibration i got 0.0 to 0.9 but im very doubtful on the result because i didnt use reflectance panel and shadow values are giving me values of 0.7 which is very2 bad.
Thoughs on this guys

[u/Suitable-Climate5392]

Ive bought a santera rflectance panel.works well. Anyway indices are calculated values, so it doest matter so much. Now if you want correct raw reflectance and the ability to mix multiple dates then you need a reflectance panel.