To calculate NDVI (Normalized Difference Vegetation Index), compare the near-infrared (NIR) and red (RED) reflectance values. This provides a measurement of vegetation health or density.
The NDVI Calculator is a tool used in remote sensing to assess vegetation health and density by analyzing the reflectance of near-infrared (NIR) and red light. NDVI values range from -1 to +1, where higher values indicate healthier and denser vegetation. This index is commonly used in agriculture, forestry, and environmental monitoring to track plant growth, detect drought conditions, and study land cover changes. Tools like NDVI maps, NDVI raster calculators, and satellite data from platforms such as Sentinel-2 or Landsat enhance precision and usability in research and analysis.
Formula
NDVI = (NIR − RED) / (NIR + RED)
| Variable | Description |
|---|---|
| NIR | Reflectance value in the near-infrared spectrum |
| RED | Reflectance value in the red spectrum |
| NDVI | Normalized Difference Vegetation Index |
Solved Calculations
Example 1: NDVI Calculation with Satellite Data
| Step | Value |
|---|---|
| NIR Reflectance | 0.8 |
| RED Reflectance | 0.3 |
| NDVI = (0.8 − 0.3) / (0.8 + 0.3) | 0.625 |
Example 2: NDVI for Sparse Vegetation
| Step | Value |
|---|---|
| NIR Reflectance | 0.6 |
| RED Reflectance | 0.4 |
| NDVI = (0.6 − 0.4) / (0.6 + 0.4) | 0.2 |
What is NDVI Calculator?
An NDVI Calculator is a specialized tool used to compute the Normalized Difference Vegetation Index (NDVI), a metric that measures vegetation health and density using satellite or aerial imagery.
It plays a crucial role in agriculture, forestry, and environmental monitoring by analyzing vegetation cover and identifying changes over time.
Moreover, the calculator simplifies the process of calculation. Whether you’re using tools like QGIS Raster Calculator, ArcGIS Pro, or an online NDVI calculator, by automating these computations.
The NDVI scale typically ranges from -1 to +1, where higher values indicate healthier vegetation, while negative values represent non-vegetative surfaces like water or urban areas.
It can also support related calculations like Leaf Area Index (LAI) or Normalized Difference Water Index (NDWI) for broader environmental applications.
Final Words
The NDVI Calculator is an indispensable resource for researchers, farmers, and environmentalists. It enables accurate vegetation analysis, supports sustainable land management, and enhances decision-making through precise data interpretation.
