MAPPING THE TURBIDITY DISTRIBUTION AROUND THE SAMBAS RIVER ESTUARY FROM LANDSAT 8 USING THE NORMALIZED DIFFERENCE TURBIDITY INDEX (NDTI)
Keywords:
Turbudity, landsat, NDTI, river, sambasAbstract
Water turbidity is one of the commonly observed water quality parameters. In general, turbidity can be measured directly in the field. However, this method is not efficient when the observed area is relatively large. To make the measurement more efficient, remote sensing technology can be used. Turbidity measurements using this technology can apply the Normalized Difference Turbidity Index (NDTI) method. The input data analyzed in this case are Landsat 8 satellite images recorded in the years 2013, 2018, and 2024. The NDTI values in 2013 ranged from -0.093 to 0.004. In 2018, the values ranged from -0.107 to 0.048. In 2024, the NDTI index values ranged from -0.112 to 0.021. Index values closer to 1 indicate turbid conditions, while values closer to -1 indicate clearer conditions. In terms of spatial distribution, the NDTI index values in the Sambas river estuary area tend to indicate more turbid conditions compared to the river mouth and coastal areas. However, among these three types of areas, the coastal zone shows relatively clearer water conditions based on the observed NDTI values.
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