ndvi equation

geocompx · Aug 9, 2023 · b59530a · b59530a
1 parent dbafd91
commit b59530a
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/04-spatial-operations.qmd b/04-spatial-operations.qmd
@@ -747,9 +747,9 @@ axes[0].set_title('Original')
 axes[1].set_title('Reclassified');
 ```
 
-The calculation of the normalized difference vegetation index (NDVI) is a well-known local (pixel-by-pixel) raster operation. It returns a raster with values between -1 and 1; positive values indicate the presence of living plants (mostly > 0.2). NDVI is calculated from red and near-infrared (NIR) bands of remotely sensed imagery, typically from satellite systems such as Landsat or Sentinel. Vegetation absorbs light heavily in the visible light spectrum, and especially in the red channel, while reflecting NIR light, explaining the NVDI formula:
+The calculation of the normalized difference vegetation index (NDVI) is a well-known local (pixel-by-pixel) raster operation. It returns a raster with values between -1 and 1; positive values indicate the presence of living plants (mostly > 0.2). NDVI is calculated from red and near-infrared (NIR) bands of remotely sensed imagery, typically from satellite systems such as Landsat or Sentinel. Vegetation absorbs light heavily in the visible light spectrum, and especially in the red channel, while reflecting NIR light, explaining the NVDI formula (@eq-ndvi):
 
-$$NDVI=\frac{NIR-Red} {NIR+Red}$$
+$$NDVI=\frac{NIR-Red} {NIR+Red}$${#eq-ndvi}
 
 Let's calculate NDVI for the multispectral satellite file of the Zion National Park.