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I am looking to fill in small gaps of no data/null values in my raster image within ArcMap.

Are there any good techniques to approach this, while also not degrading the image in the process?

Image with Null Values

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Fill in Arcmap helps to remove imperfections in surface raster Data. Go to Arc Toolbox, Spatial Analyst Tools ,Hydrology , Fill. This Fill will use the surrounding cell values to interpolate for the null value in the surface raster.

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