What is pansharpened?

Pansharpening is a technique used to enhance the resolution of a multispectral image by adding details from a high-resolution panchromatic image. This is done by merging the high-resolution black and white image with the lower-resolution multispectral image, resulting in a higher-resolution color image. Pansharpening is commonly used in remote sensing, satellite imaging, and aerial photography to generate high-resolution topographic maps, land-use maps, and environmental monitoring data. Several algorithms are used for pansharpening, including Brovey transform, intensity-hue-saturation transform, and principal component analysis. The quality of the resultant image largely depends on the quality and alignment of the input images and the algorithm used for pansharpening.