Question: Is it possible to calculate average NDVI in a picture using infragram's sand box?

Hala73 asked on May 03, 2018 19:42
128 | 2 answers | shortlink


hi all,

I am using pictures taking with a camera modified with infragram's NDVI lense (red filter I think) to derive NDVI as: (R-B)/(R+B). I'd like to know if I can calculate the average NDVI in a picture, or a selected area in a picture using infragram's sandbox. Should use a different software for that?

Hala



ndvi infragram photo-monitoring-plugin answered multispectral-imaging image-sequencer

question:ndvi question:infragram question:multispectral-imaging question:general question:photo-monitoring-plugin question:image-sequencer



0 Comments

Log in to comment

2 Answers

I don't think calculations at Infragram.org can be used for anything but determining the color of a new image. The Photo Monitoring plugin and Fiji can average any part of an NDVI image: https://publiclab.org/notes/nedhorning/01-13-2016/packaged-photo-monitoring-plugins-available-on-the-github-repositoy

Chris


Hala73 23 days ago

Thank you, these are plugins for PC but I'll look for something similar that works on a mac.

warren 17 days ago

Hi, @Hala73 - Fiji can be installed on a mac, actually -- and ImageJ (same app) on Linux.

Hala73 17 days ago

I'll give it a try then, thanks!

Log in to comment

We're developing a new system based on Infragram, which is more systematic, and can output things like averages, etc. We're testing this out now and it's a prototype, but you should be able to use this to calculate NDVI from an image, then average the result:

https://publiclab.github.io/image-sequencer/examples/#steps=ndvi,average

If you want to crop a specific region first, you can use:

https://publiclab.github.io/image-sequencer/examples/#steps=ndvi,crop,average

However there is a bug in the crop module that may cause you some trouble -- we're working on it but it's dicey at the moment.


Hala73 17 days ago

Thanks for that, I'll give it a try and let you know how it worked

Log in to comment

Sign up or Login to post an answer to this question.