National Radio
Astronomy Observatory

7.2.3 Region Selection and Positioning

You can draw regions or select positions on the display with the mouse, once you have selected the appropriate tool(s) on the Mouse Toolbar (see above).

The Rectangle Region drawing tool currently works for the following:

• Region statistics reporting for images,
• Region spectral profiles for images, via the Tools:Spectral Profile menu,
• Flagging of Measurement Sets
• Creating and Saving an image region for various types of analysis (§ 7.3.5)
• Selecting Clean regions interactively (§ 5.3.5)

The Polygon Region drawing has the same uses, except that polygon region flagging of an MS is not supported.

The Positioning tool works for the last two of the above.

The Spectral Profile display (see § 7.3.4), when active, updates on each change of the rectangle, polygon, or point position. Flagging with the pointer also responds to single click or drag.

Region statistics are printed in the terminal window (not the logger) by double-clicking the completed region. The statistics are also displeyed in the region dock (§ 7.3.5). The Rectangle Region tool’s mouse button must also be double-clicked to confirm an MS flagging edit.

Here is an example of region statistics from the viewer:

More information about CASA may be found at the CASA web page

Copyright © 2010 Associated Universities Inc., Washington, D.C.

This code is available under the terms of the GNU General Public Lincense