Public Lab Research note


NDVI Quick Analysis Application

by daniedb68 | May 28, 2014 16:00 | 477 views | 5 comments | #10513 | 477 views | 5 comments | #10513 28 May 16:00

Read more: publiclab.org/n/10513


FirstOff, I hope I'm allowed to post this here. First time, and new to everything :-(

What I want to do

I'm completely new to NDVI photos and recently only receive my InfraBlue Filter Paper. Reading on the web about NDVI, i try to figure out which colors represents what. So I've written a small program for myself to try and analise the Photo

My attempt and results

Quick show of the analysis

Questions and next steps

Please let me know if I'm on the right track or completely off. Comments, suggestions, put me on the right track, WELCOME...

Demo of the software can be downloaded here. Completely FREE http://www.leznadsoftware.co.za/downloads/drawndvi.zip

Steps. 1. Copy to a folder on your HDD 2. Run the EXE 3. Load a NDVI color photos 4. Move mouse around and see the result on the botton list


5 Comments

Glad to see you experimenting, I wish I could test your program, but It looks Windows only. have you looked at either our Infragram.org or Ned Horning's work with ImageJ which is cross-platform?

Is this a question? Click here to post it to the Questions page.

Reply to this comment...


Sir, this is very nice tool. I used it with some raw images I took a few years back. I can understand better what I am looking at, grass, sky, trees and tell the difference in NDVI. What I do not know is how to interpret the information. What is healthy? What is not? Is that range of 0.1 - .1 healthy?

Jim

Is this a question? Click here to post it to the Questions page.

Reply to this comment...


Jim Thanks. I'm also in a Learning Curve. But according to what I understand 0.1-0.6 is very green. Plants/vegetation is between 0.2 to 0.8. I might be wrong. Please someone correct if I am I'm busy with some updates, where you can add your own ndvi Color chart, depending of the type of convertion used. I mostly use Fiji-App, with physics and NDVIblu2red.lut files.

Something to Note: if the color Bar don't move when on the NDVI image, edit the ini File as follows 1. Put the cursor in the middle of the NDVI color Bar at the bottom 2. Note the MouseY position eg: 507 3. edit the settings.ini file 4. Change the ypos= to the value on your monitor 5. save the file and try again. I'm in the process of automate this, hopefully the next version will check screen size and resolution and do this automatically.

Danie

Reply to this comment...


Danie, thank you for the insight. I will keep learning. I find this area interesting.

Reply to this comment...


JIm, Yes, me too. Also very new to NDVI. I post a Update on the NDVI App soon, which have more LUT comparisions aswell as some examples, and fixes... watch this space :-) CHerio Danie

Reply to this comment...


Login to comment.

Public Lab is open for anyone and will always be free. By signing up you'll join a diverse group of community researchers and tap into a lot of grassroots expertise.

Sign up