|
|
|
|
Relationship between mixing proportions and NDVI.
|
|
| The Normalized Difference Vegetation Index (NDVI) is defined by using the reflectance values of a pixel in the red and infrared bands. | |
|
|
| where B1 is the red band and
B2 is the infrared band.
Let us assume that a is the fraction of vegetation in the pixel. a can be calculated with the help of various spectral unmixing methods. Both a and NDVI give an estimate of the vegetation cover of the ground. Which of the two is better to use?
|
|
Advantages of using NDVI
|
|
 |
Disadvantages of using NDVI
|
Advantages of using the mixing proportion a
|
|
Disadvantages of using the mixing proportion a
|
|
Comparison of the two indicators
|
|
|
|
