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Steps Mosacking.

Mosaicking is a process of combining multiple raster datasets into one seamless mosaic. Here are the steps to mosaicking in ArcMap using the Data Management Tool:

Open ArcMap and create a new map document.

Click on the "ArcToolbox" button on the main toolbar to open the ArcToolbox window.

In the ArcToolbox window, navigate to "Data Management Tools" - "Raster" - "Raster Dataset" - "Mosaic to New Raster".

Double-click on "Mosaic to New Raster" to open the tool.

In the "Mosaic to New Raster" dialog box, under the "Input Rasters" section, click the "Add Rasters" button to add the raster datasets you want to mosaic.

Choose the appropriate option under the "Raster Type" section to define how the output mosaic should be created (e.g., "Mosaic Colormap Mode" for datasets with a color map, "Mosaic RGB" for three-band datasets).

In the "Output Raster Dataset" section, specify the output location and name of the mosaic.

Choose the appropriate resampling method and cell size under the "Processing" section.

Click the "Environments" button to set any additional processing options or environment settings.

Click "OK" to run the tool and create the mosaic.

Once the mosaic is created, add it to your map document by going to "File" - "Add Data" and selecting the mosaic raster dataset.

Finally, symbolize and label the mosaic as desired to create a finished map.