Shrinking seamlines

步骤：

1. Click the Select Features button and select one or more seamlines.

   Hold down the SHIFT key to select more than one.

   If you don't select a single seamline, all the seamlines will be shrunk.

2. Right-click the Seamline layer in the table of contents and click Shrink Seamlines.
3. If one or more seamlines have been selected, you can choose to ignore the selection or to only use the selected raster dataset seamlines. Click OK.
4. Type the width and height to which you want the seamlines to be shrunk.

   The units are defined by the spatial reference system of the image service definition.