2023-10-07

Normalized Difference B04-B12

📐 20m/Pixel ☁️ 6.7% Contamination 🛰️ S2A
True Color Image (TCI)
Spectral Index Raster

🧮 Data Processing Explanation

This visualization shows a spectral index analysis derived from Sentinel-2 satellite data:

Spectral indices are calculated using the normalized difference formula on Sentinel-2 multispectral bands:

$$\text{Index} = \frac{ B04 - B12 }{ B04 + B12 + 0.00001}$$

Processing Pipeline

  • Cloud Masking: OmniCloudMask identifies cloud and shadow pixels, which are excluded from calculations
  • Spectral Calculation: Normalized difference computed server-side in PostgreSQL on valid (non-masked) pixels only
  • Geographic Clipping: Results clipped to Gaza Strip boundary (EPSG:32636 UTM Zone 36N)
  • Colorization: Values mapped to black-to-orange colormap; masked areas shown in neon blue

Color Mapping

  • Black → Orange Valid spectral index values
  • #0080FF Cloud/shadow masked areas
  • Transparent Areas outside Gaza

🛰️ Product Information & Attribution

Product ID S2A_MSIL2A_20231007T081821_N0510_R121_T36RXV_20241108T203220
Sensing Time 2023-10-07 08:18:21 UTC
Orbit 121
Tile ID T36RXV
Processing Baseline N051
Credit Line Contains modified Copernicus Sentinel data 2023
Data Source https://dataspace.copernicus.eu/
Modifications Derived spectral index product calculated from Sentinel-2 MSIL2A bands [B04, B12] using normalized difference formula. Original raster data processed through server-side PostgreSQL functions and cropped to Gaza Strip AOI.