Question 5: What I can see

[True & False Colour Images]

[True Colour]

A true-color map is an image that appears to the human eye like the original subject would.

So,  green vegetation areas appear as green in the image, the Oceans appear as dark blue, clouds and snow covered areas appears as white, etc. In order to make a true colour image, the three bands that represent red, green, and blue (RGB) in the visible spectrum are combined. Each band is displayed in a monochromatic scale corresponding to its appropriate colour.

http://oceancolor.gsfc.nasa.gov/SeaWiFS/TEACHERS/TrueColor

[False Colour]

In a false-color image, subject color and image color is different. This alternation can be happened in many ways.For example, the near infrared band (band 4 is projected onto colour film through a red filter (R), band 3 through a green filter, and band 2 through a blue filter. In this case, the red coloured area will represent VEGETATION, Black coloured area will represent WATER in false colour image.

REG Mapper

[Greyscale Images]

Grayscale image is an image with black and white colours. All three Red, Green, Blue bands should be chosen together.

IMAGES OF Prince Edward Island

 

 

IMAGES Of Auyuittuq National Park of Canada

[NDVI]

the Normalized Difference Vegetation Index (NDVI) was run on both images to analyze the vegetation degree in both locations. During the analysis, the first image shows denser vegetation in the overall area compared to the second Image. The darker the shade of red means that the area is dense in vegetation. Consequently, the lighter the shade of red the less vegetation density there is in the area. If the location is blue, then this means that there is no vegetation, clearly seen in the water bodies in both images.

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