[OSGeo Africa] CIR and False Colour

[Aslam Parker]

Hi All

False color (or false colour) refers to a group of color rendering methods used to display images in color which were recorded in the visible or non-visible parts of the electromagnetic spectrum.

A false-color image is an image that depicts an object in colors that differ from those a photograph (a "true-color" image) would show. The simplest false-color encoding is to take an RGB image in the visible spectrum, but map it differently, e.g. "GBR→RGB". For "traditional false-color" satellite images of Earth a "NRG→RGB" mapping is used, with "N" being the near-infrared spectral band (and the blue spectral band being unused) – this yields the typical "vegetation in red" false-colour images.

It is not correct to say that false colour = colour infrared, because CIR is one of the many encoding (combinations) of false colour .

CIR is created when the bands are displayed in the following order:G,B,NIR

From: Africa [mailto:africa-bounces at lists.osgeo.org] On Behalf Of Khalid Mather
Sent: 01 November 2016 03:26 PM
To: Africa local chapter discussions
Subject: Re: [OSGeo Africa] CIR and False Colour


Wow thanks theo for the wealth of information, my lecturer is also a part of this mailing forum and he lambasted me for asking elementary questions 😂, but if you dont know you gotta ask right?
(CiR are false colors btw)

.anyways I do have time, because this is going to be part of my masters work . I will table these suggestions to him and get back to you if needed.

Thank you so much once again Sir

Warmest Regards
Khalid Mather

On 01 Nov 2016 15:19, <theo at integritsense.co.za<mailto:theo at integritsense.co.za>> wrote:

Hi Khalid

SANSA has access to ADS Pleiades 0.5m GSD satellite imagery (can be tasked, or you can look for catalogue).

1. That should fit the student budget.

2. Unsure.

3. Try SANSA, maybe? Otherwise the CGA at Stellenbosch University.

4. OBIA packages, or (if you are feeling very lucky and have time to train the classifier, supervised pixel based image classifiers coupled with a DSM and DEM).

Alternatively, there are UAV based solutions out there. If you need help with those, give me a shout. We have pretty good contacts that side that could do it, whom we have used before.

Best regards,
Theo

Theo Pistorius
Founder: IntegriSense & DroneClouds
+27 79 798 8558<tel:%2B27%2079%20798%208558>
theo at integritsense.co.za<mailto:theo at integritsense.co.za>

From: Khalid Mather
Sent: Monday 31 October, 14:55
Subject: [OSGeo Africa] CIR and False Colour
To: Africa local chapter discussions

Hi Guys  , hope you are all keeping well.

I am attempting a project to measure street Tree biomass or tree presence in the greater Durban region. I have a few questions though

1.  is very high spatial resolution data available for use (on a students budget)

2. are Colour Infra-Red and False Colour images the same thing?

3. Where can I find CIR/ False colour images of Durban?

4. Does anyone have any input as to how this project can be achieved with as few additional resources as possible? 😂

Thanks and kind Regards

Khalid Mather

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