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.

• oh yeah. the filter that Christiaan used from publiclab lets Blue and Green and NIR through but blocks Red. thus the camera is detecting NIR in the Red Channel. A straight NIR image would only be red, not red and blue like Christiaans.

• Hi criro1999.

the equation for an NDVI is the following. NDVI=(NIR+VIS)/(NIR-VIS). the equation is performed on each of the pixels of the image. Some people use the red band from their camera in order to provide the VIS value for the equation. but what a lot of people are finding works quite well is to simply use the blue band. that way you do not need to carry two camera's in order to do vegetation mapping for NDVI.

The most user friendly software for performing this type of work is the freeware software QGIS. It has a very powerful plugin called GRASS which can perform a lot of remote sensing functions.

Hope that helps

• 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?

• Also Photoshop can convert NDVI images

• 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?

• 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