| 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 |