GeoTiff Bands - Why 4 Bands Generated?

Hey all,

I'm currently writing an ecology manuscript with imagery derived from DJI Phantom 4 flights and mosaicked with Maps Made Easy. As far as I understand, the JPEG images I uploaded are 3 band (RGB); however, the GeoTiff that is downloaded from Maps Made Easy is 4 band and needs to be reduced back to a 3 band raster before I can conduct any further analyses in ArcMap. Why is a 4 band GeoTiff generated in the first place? Is this always the case? Is the 4 band automatically generated in case the user utilizes a camera with a near-infrared (NIR) band? Thank you.

Regards,
Wes Anderson

Wes Anderson 2019년 12월 14일 03:56

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I think it is to manage transparency, like RGBA with A being Alpha.

Zane 2019년 12월 15일 00:35 0 표

Thanks, Zane. That makes sense. Does anybody have anything to add or is anybody able to confirm this?

Wes Anderson 2019년 12월 16일 16:09 0 표

Zane - Looking at other posts, I'm led to believe you're affiliated with Drones Made Easy. Is that the case? If so, my follow-up post wasn't to second guess you at all. I just wanted to make sure the details were correct before sending this off to my coauthors. Thank you.

Wes Anderson 2019년 12월 16일 16:14 0 표

Yes, I do the support here.

Zane 2019년 12월 17일 00:30 0 표