Neatline - metadata for georeferenced item

Is there a way to add metadata to a georeferenced map?

Not sure what you mean...there is metadata in the geotiff about the image. There are also metadata standards for describing spatial datasets (like geoferenced maps), but that generally sits outside of the metadata and refers to the dataset though a URI.

I want to be able to display Doublin Core same way they get displaied for other items added to Omeka collection but since the the geotiff is coming from the Geoserver I'm not sure how to go about that.

You can upload an un-referenced version of the image and describe it in DC and attach that record to the Neatline record, or just type in the relevant information in the record's body.

thanks Wayne