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How to Calculate NDWI and Modified Normalized different water Index using Arc GIS Complete Tutorial

you will need to follow these steps: 1. Obtain Sentinel-2 Imagery Ensure you have downloaded the necessary Sentinel-2 imagery. Sentinel-2 provides data in different bands, and you will need specific bands for NDWI and MNDWI calculations. 2. Open ArcGIS Launch ArcGIS and open your Sentinel-2 imagery. 3. Calculate NDWI NDWI is typically calculated using the green band (Band 3) and the near-infrared band (Band 8). The formula for NDWI is: NDWI=(𝐵𝑎𝑛𝑑3−𝐵𝑎𝑛𝑑8)/(𝐵𝑎𝑛𝑑3+𝐵𝑎𝑛𝑑8) 4. Calculate MNDWI MNDWI is calculated using the green band (Band 3) and the short-wave infrared band (Band 11 or Band 12). The formula for MNDWI is: MNDWI=(𝐵𝑎𝑛𝑑3−𝐵𝑎𝑛𝑑11)/(𝐵𝑎𝑛𝑑3+𝐵𝑎𝑛𝑑11) 5. Visualize and Analyze Once you have calculated the NDWI and MNDWI rasters, you can visualize and analyze them in ArcGIS: Apply Symbology: Use appropriate symbology to highlight water bodies. Thresholding: Apply threshold values to classify water and non-water areas based on NDWI and MNDWI values. NDWI (Normalized Difference Water Index) Range: -1 to +1 Interpretation: Positive Values (0 to +1): Indicate the presence of water. The higher the value, the higher the likelihood and extent of water. Zero (0): May indicate the boundary between water and non-water areas. Negative Values (-1 to 0): Typically represent non-water features such as vegetation, soil, or urban areas. MNDWI (Modified Normalized Difference Water Index) Range: -1 to +1 Interpretation: Positive Values (0 to +1): Indicate the presence of water. MNDWI is often more effective at highlighting water bodies, especially in urban areas, than NDWI. Zero (0): May indicate the boundary between water and non-water areas. Negative Values (-1 to 0): Typically represent non-water features such as vegetation, soil, or urban areas.