Merging service overviews

步骤：

1. Open the service table.
2. Select two or more service overviews you want to merge. You can either close the service table or minimize it.
3. Click the Image Service drop-down menu on the Image Service Definition Editor toolbar and click Advanced > Optimize > Service Overviews > Merge.

   The Image Service Editor dialog box informs you that the selected service overviews will be merged and asks if you want to proceed.

4. Click Yes to merge the derived tiles.

   You can see the merged tiles.

5. Click the Image Service drop-down menu on the Image Service Definition Editor toolbar and click Advanced > Build.
6. Check the Compute pixel size ranges and Generate derived images options on the Build Options dialog box.
7. Open the service table to see the new merged record that was added.