Decibel vs Linear Averaging in Sentinel-1 SAR: Error Analysis and Correct Workflow in GEE | Video-6
This video presents a detailed analysis of averaging methods for Sentinel-1 SAR backscatter data in Google Earth Engine, focusing on the critical distinction between decibel and linear domains.
A common mistake in SAR processing is the direct averaging of backscatter values in decibel scale, which is mathematically inappropriate due to its logarithmic nature. In this tutorial, we demonstrate the correct workflow by converting decibel values to linear scale prior to averaging, and then transforming the results back to decibel.
The video systematically analyses six outputs, including VV and VH composites generated using both incorrect and correct approaches, along with error maps that quantify the deviation between them.
Key highlights:
Conceptual understanding of decibel vs linear averaging
Step-by-step implementation in Google Earth Engine
Visual and statistical comparison of outputs
Interpretation of error distribution across land surfaces
This content is particularly relevant for remote sensing students, GIS professionals, and researchers working with SAR data for applications such as flood mapping, vegetation analysis, and land surface monitoring.
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