Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Geography
Vegetation Index Calculator
Calculate the Normalized Difference Vegetation Index (NDVI) from near-infrared and red reflectance values. Used in remote sensing and ecology to assess plant health, biomass, and land cover change.
Fill in the required fields to see your result.
Geography
Drainage Density Calculator
Calculate the drainage density of a watershed by dividing total stream length by drainage area. Used by hydrologists and geomorphologists to assess erosion potential, flood response, and landscape evolution.
Fill in the required fields to see your result.
Key differences
| Vegetation Index Calculator | Drainage Density Calculator | |
|---|---|---|
| Category | Geography | Geography |
| Inputs required | 2 | 2 |
| Result | NDVI | Drainage Density (km/km²) |
| What it does | Calculate the Normalized Difference Vegetation Index (NDVI) from near-infrared and red reflectance values. Used in remote sensing and ecology to assess plant health, biomass, and land cover change. | Calculate the drainage density of a watershed by dividing total stream length by drainage area. Used by hydrologists and geomorphologists to assess erosion potential, flood response, and landscape evolution. |