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I have a raster of the average chlorophyll-a concentration for 1 year (NASA MODIS LEVEL2 1km res). However i am still missing values for the pixels near the coastal zone (really important for our study). Is there anyway I can interpolate and fill these fairly accurately?

So far i have just been experimenting with focal statistics in arcgis, but not really getting accurate results....

snip of part of study area

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I would say using focal statistics is actually the right approach. What is the problem with the results by using focal statistics?

This thread should help you: Fill in NoData gaps in raster using ArcGIS for Desktop?

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