Question

1. Draw the feature space plot (scatter plot) for the Green-Red, NIR-Green and NIR-Red band combinations. Based on these plots, which two bands are the most correlated?

   105 97 85 82 82 81 108 104 93 82 81 81 106 109 102 88 81 81 106 108 103 89 84 81 105 106 104 95 89 83 104 102 98 94 90 86 Green

   128 115 95 89 89 90 129 124 109 94 89 89 128 133 125 102 93 89 129 134 124 101 95 90 130 128 126 112 104 92 128 125 118 108 104 96 Red

   102 97 91 91 91 92 104 101 96 92 90 90 103 106 100 92 90 89 102 106 101 93 92 89 102 103 102 97 95 90 101 99 98 99 98 94 NIR

Answer 1

By seeing all possible scatter plots between Green, Red, and NIR, The two bands which are most correlated are

(Red- Green) and (Green - NIR) and we can crosscheck our answer by calculating the correlation coefficient between them.

cor(Green, Red) = 0.9952777 and cor(NIR, Green) = 0.9750441

Green
[1] 105 97 85 82 82 81 108 104 93 82 81 81
[13] 106 109 102 88 81 81 106 108 103 89 84 81
[25] 105 106 104 95 89 83 104 102 98 94 90 86
> Red
[1] 128 115 95 89 89 90 129 124 109 94 89 89
[13] 128 133 125 102 93 89 129 134 124 101 95 90
[25] 130 128 126 112 104 92 128 125 118 108 104 96
> NIR
[1] 102 97 91 91 91 92 104 101 96 92 90 90
[13] 103 106 100 92 90 89 102 106 101 93 92 89
[25] 102 103 102 97 95 90 101 99 98 99 98 94
> plot(Green,Red)
> plot(NIR,Green)
> plot(NIR,Red)
> plot(Green,Red)
> cor(Green,Red)
[1] 0.9952777
> cor(NIR,Green)
[1] 0.9750441
> cor(NIR,Red)
[1] 0.9681377