I am trying to mosaic the Landsat satellite imagery of an ROI to fill the masked cloud regions. For this, I am using f1023clip and f5163clip (as shown in images below).

I am trying to mosaic the two tiles with f1023clip followed by f1563clip using the 'first' operator, however, I get the following result: wherein the f1023clip area turns all black with its no data areas now filled with f1563clip tile.

If I use the 'last' operator, it only comes up with f1563clip tile, which should be that way only

How do I correct this?

I am using ArcGIS Pro, but am facing a similar problem with SCP plugin in QGIS too.

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  • Suggest you edit your question and show how you are using the mosaic rasters tool as its not clear what is happening.
    – Hornbydd
    Jan 9, 2022 at 22:07

2 Answers 2


I can see that these inputs(f1023clip and f5163clip) are a result of the clip raster function, and you have then used the Mosaic function to stitch these two clips together. Correct me if I misunderstood.

I would rather say you should try using the recommended workflow to create and work with mosaics in ArcGIS Pro/ArcMap.

Moving ahead, you must have the entire imagery for the study area, which is not clipped, so try following the below steps to create a mosaic dataset first in ArcGIS Pro.

The demo below is using one single tool to create a mosaic that can be tested:


If the above does give you the black mosaic output, try using the combination of create and add rasters GP tools:


Note: Once you get the correctly mosaicked imagery, go ahead with clipping it to your AOI using the Clip raster function, or Extract by Mask GP tool.


I figured out the problem, the two tiles I was trying to mosaic weren't of the same format. I converted them both to float and it worked!

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