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It is recommended to preserve the original raster datasets wherever possible, so the Mosaic tool and the Mosaic To New Raster tool with an empty raster dataset as the target dataset are the best choices to merge raster datasets. The Mosaic tool is used to mosaic multiple input rasters into an existing raster dataset. The existing raster dataset can be empty or it can already contain data. The tool is used to merge rasters that are adjacent and have the same cell resolution and coordinate system. Similar to the Mosaic tool, the Mosaic To New Raster tool is used to mosaic multiple input raster datasets. However, unlike the Mosaic tool, the Mosaic To New Raster tool saves the output mosaic in a new empty raster dataset which it creates on the fly.
The instructions provided describe how to merge multiple raster datasets into a new raster dataset using the Mosaic To New Raster tool in ArcMap. The following figure displays an example of raster datasets to be merged into one raster dataset.
To merge two or more raster files together using the Mosaic To New Raster tool, follow the steps below.
Note: This tool may take a while to run depending on the resolution of the images and their size.