By default, OMERO iviewer indicates X and Y coordinates of the mouse pointer in terms of pixels.
Given that the image data holds the scaling factor, once you set a reference point in an image by giving X, Y and Z coordinates (in terms of a mouse brain atlas [http://chamber.mrc.ox.ac.uk/iviewer/?dataset=51], they can actually represent anteroposterior, dorsoventral, and mediolateral for example), then OMERO can work out the X, Y, Z coordinates in µm or mm in the real world. This would be helpful in some use cases I believe.
For example, ImageJ supports this kind of scaling, though it does not allow you to choose arbitrary reference point.
Do you think this is worth implementation?
Thanks,
Kouichi