Cautions when using the mosaic tool to edit an existing mosaic

• The APT Undo capability has not been implemented for mosaic buttons that generate, synchronize, reset, and covert the mosaic. So at the current time the Undo history will be cleared when using those buttons.


• If you change the number of rows and columns in a mosaic you must regenerate the mosaic. All updates that you had made to the individual tile visits will be lost (both content and position changes).


• If you move individual tile visits using Aladin and do not commit those changes back to the proposal, those position changes will be lost if you synchronize the contents of the tile visits with the template visit.


• If you change the overlaps or shifts for the mosaic you will lose position changes made to individual tile visits, even if you have committed those changes back to the proposal.

We further recommend that you

• Do not modify the special requirement POS TARG on the exposures of a Mosaic. If you need to specify small custom dithers on the exposures (which you may normally do with the POS TARG requirement) please use the special requirment DITHER POS TARG which only appears in the exposures of a template visit.


• Do not delete the template tile. If you do need to get rid of the first tile (which is the template) you can delete it and the second tile will become the template for the mosaic, but you will need to remove a broken SAME ORIENT link from the new template.


• Do not drag or cut/copy/paste visits in or out of mosaic containers once you have generated a mosaic. You should be able to make the modifications you need to the mosaic within the mosaic container.