Editing service overviews

步骤：

1. Open the service table.
2. Select any service overviews to edit. 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 > Edit.
4. Move the handles or anchor points to change the shape and size of the service overview.
5. Click the Image Service drop-down menu on the Image Service Definition Editor toolbar and click Advanced > Optimize > Derived Tiles > Edit to save the changes.
6. Click the Image Service drop-down menu on the Image Service Definition Editor toolbar and click Advanced > Build.
7. Check Compute pixel size ranges and Generate derived images options on the Build Options dialog box.