Blogs

NIR Images in the Makgadikgadi

Posted by Christiaan van Vollenstee on January 6, 2014 at 11:06pm

Hello,

I was touring the makgadikgadi this December in Botswana and here is some interesting Raw NIR images I have taken.

Here are some boabab trees in the NXAI salt pans

Here is of the salt pans

Here is of an elephant covered in mud, note the previous images containing people where the people is a purple as well and then look at the elephant covered in mud.

Here I took an image with a healthy bush next to a dead bush, see the difference.

You can go and download these images and process them at http://www.infragram.org/ and see the NDVI and IR Image of these images. We will be shortly adding this camera to one of hour talons to do some aerial photography.

c-faktor, christiaan van vollenstee, nir image

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Comments

criro1999 January 10, 2014 at 6:17am

Tutorial from link above is very good, the software is not Photoshop, but GIMP (open source).

What is mentioned in tutorial is you need to have 2 images in order to produce the NDVI images. You need the NIR and also the visual RGB. Then but combining those 2 (based on formulas add, substract, devide), then you obtain the NDVI.

Now I am little confuse how you can obtain the NDVI with just NIR image as input, can you explain?
criro1999 January 10, 2014 at 5:48am

Also Photoshop can convert NDVI images

https://www.youtube.com/watch?v=-nNnWEHNO_w
criro1999 January 10, 2014 at 5:44am

I did find a tool (Global Mapper) who can process NDVI images, but not tried yet. I believe they have a trial version to download. Did you use this software for NDVI images?
Christiaan van Vollenstee January 9, 2014 at 10:14pm

I see their services is a bit offline. I am not sure what other tools there are to convert these images.

Here is a php script if you know how to use it

http://forum.worldwindcentral.com/showthread.php?2869-NDVI-amp-NIR-...
criro1999 January 9, 2014 at 12:39pm

I did try converting of of your NIR image to NDVI, using the link provided, in order to make visible the photosynthesis of plant, but when it start conversion (after upload), I got repeated time next message below. Any idea?

"The page you are looking for is temporarily unavailable.
Please try again later."
Christiaan van Vollenstee January 8, 2014 at 10:21pm
Christiaan van Vollenstee January 8, 2014 at 10:20pm

One of the main uses of NIR images is a type of post processing where you can monitor the health status (photosynthesis) of plants. See the last photo.
Moderator

Graham Dyer January 8, 2014 at 10:17pm

What's the purpose of NIR images? They just look pink to me :))
Christiaan van Vollenstee January 8, 2014 at 10:07pm

Check out this video in the makgadkgadi I took with the multirotor

http://www.diydrones.com/forum/topics/makgadkgadi-tour-with-my-mult...
Christiaan van Vollenstee January 7, 2014 at 10:26pm

@Criro I used a sony cybershot 10.1 megapixel for this (I recommend the SX230HS) and I removed the IR filter and in the same cavern I placed a blue filter from public lab.

One can play around with the images from this tool http://infragram.org/static/sandbox/ , here is a little blog regarding this http://www.publiclab.org/notes/cfastie/11-12-2013/red-filter-rising

@Petrus I flew at kubu island and all over the makgadkgadi nature reserve with the new 433mhz telemetry modules (wich was connected to a tablet) and 5.8ghz 500mw FPV and had no issues. I am busy uploading the videos to youtube and will post it as soon as possible.

One c