Table 2 Environmental indices calculated by the EASTWeb software
Name | Description | Source |
|---|---|---|
Precipitation | Total amount of water falling from the atmosphere to the land surface (mm/week) | \(\sum\limits_{d = 1}^{7} {P_{d} }\) |
Land surface temperature | Radiative skin temperature of the earth’s surface (°C) | \(\frac{{\left( {T_{d} + T_{n} } \right)}}{2}\) |
Normalized difference vegetation index | Indicator of the amount of green vegetation. Can serve as a proxy for available soil moisture in water-limited environments | \(\frac{{B_{2} - B_{1} }}{{B_{2} + B_{1} }}\) |
Soil-adjusted vegetation index | Similar to NDVI, but minimizes soil brightness influences | \(\frac{{1.5 \times \left( {B_{2} - B_{1} } \right)}}{{B_{2} + B_{1} + 0.5}}\) |
Enhanced vegetation index | Similar to NDVI, but corrects for atmospheric distortion and ground cover below canopy | \(\frac{{2.5 \times \left( {B_{2} - B_{1} } \right)}}{{B_{2} + 6 \times B_{1} - 7.5 \times B_{3} + 1}}\) |
Normalized difference water index | Indicator of water content in vegetation and at the soil surface | \(\frac{{B_{2} - B_{5} }}{{B_{2} + B_{5} }}\) |
\(\frac{{B_{2} - B_{6} }}{{B_{2} + B_{6} }}\) |