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Daewon Kim <dwkim@mpifr-bonn.mpg.de> </td>
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Awaiting Agent
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Redhat 7-64bit
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Good day, When we do the polarization calibration with LPCAL in AIPS (after the final image is obtained; VLBI image via Difmap), it starts by creating a number of Boxes that split the C...
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<div>Good day,</div><div><div><br></div><div>When we do the polarization calibration with LPCAL in AIPS (after the final image is obtained; VLBI image via Difmap), it starts by creating a number of Boxes that split the CLEAN components into several groups. Then, each Box includes a group of the CLEAN components. This process can be done with e.g., the task 'TVBOX' that gives us pixel coordinates of the Boxes like below.<br></div></div><div><div>(e.g.,)<br></div><div>AIPS 1: BOX( 1) = 242.00 247.00 269.00 272.00</div><div>AIPS 1: BOX( 2) = 248.00 228.00 271.00 247.00</div><div><br></div><div>My first question here is,<br></div><div>The pixel coordinates of the two boxes in the above example, all those 8 numbers have ".00" at the end. What does it mean? Are they rounded (up?/down?) numbers when we draw a rectangle with TVBOX?<br></div><div><br></div><div>The second question is,<br></div><div>What is the central/reference pixel coordinate? (e.g., if there are 2048 pixels in each x and y axis, for both axis, is it 1024? or 1025?)</div><div><br></div><div>Best regards,</div><div>Daewon</div><div><br></div><div><br></div><div><br></div></div>
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