I have downloaded the Blue Marble dataset, and it consists of eight GeoTIFF images, labeled like this: A1 B1 C1 D1
A2 B2 C2 D2
I would like to use these tiles for GeoServer to be served as WMS. Unfortunately, I don't know how to use multiple images as data source.
1) Can this be somehow done in GeoServer?
2) If not, what tool can be used to merge such images into single huge GeoTIFF file? IrfanView is out of question, it freezes trying to open a single image...