Image fusion
From AWF-Wiki
(Difference between revisions)
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# Load the input image | # Load the input image | ||
# Open the raster calculator and apply the following formula: Y = 0.20 * NIR(B8) 0.15 * Red(B4) + 0.58 * Green(B3) + 0.07 * Blue(B1) | # Open the raster calculator and apply the following formula: Y = 0.20 * NIR(B8) 0.15 * Red(B4) + 0.58 * Green(B3) + 0.07 * Blue(B1) | ||
| − | [[File:rastercalc.png | + | [[File:rastercalc.png]] |
# Define path and name for the output layer | # Define path and name for the output layer | ||
# Click on the ‘OK-button’. | # Click on the ‘OK-button’. | ||
Revision as of 18:46, 16 November 2017
Pansharpening of Sentinel-2 requires defining a 10m reference band because there is no panchromatic band as for Landsat available. The only option is a selection among the 10-m bands (2, 3, 4, or 8) or synthesis (e.g. weighted average of 10-m band). Following the latter approach, the luminance can be calculated from the Blue, Red Green and NIR band to receive a single band grey scale image.
Create a synthesis panchromatic band
- Load the input image
- Open the raster calculator and apply the following formula: Y = 0.20 * NIR(B8) 0.15 * Red(B4) + 0.58 * Green(B3) + 0.07 * Blue(B1)
- Define path and name for the output layer
- Click on the ‘OK-button’.
Create a pan-sharpened layer
- Search for Pansharpening (Bayes) algorithm in the Processing Toolbox.
- Select pseudo-panchromatic band as the Input PAN Image.
- Select the layer contain the original 20m bands as the InputXS Image.
- Specify the directory to save the output file and click on the ‘Run-button’.
Compare the fused image with the original image
