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This question already has an answer here:

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

marked as duplicate by Evil Genius, Andre Silva, Mapperz Nov 21 '16 at 15:36

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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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