| WDVI Algorithm Specification | |
The Weighted Difference Vegetation Index
algorithm was introduced by Clevers (1988).
This has a relationship to PVI similar to the relationship IPVI has to NDVI.
WDVI is a mathematically simpler version of PVI, but it has an unrestricted range.
Like PVI, WDVI is very sensitive to atmospheric variations (Qi et al., 1994).
The WDVI results from the following equation:
WDVI = (IR_factor * near_IR - g * red_factor * red)
where: g is the slope of the soil line.
Also the processor computes an additional flags band called 'wdvi_flags' with the following bit coding:
| Bit Position | Description |
|---|---|
| Bit 0 | The computed value for WDVI is NAN or is Infinite |
| Bit 1 | The computed value for WDVI is less than -Infinity |
| Bit 2 | The computed value for WDVI is greater than Infinity |