Normally I would create an Image Pyramid using gdal_retile.py on one large image or a set of large images.
I want to do the opposite. I have all the zoomed in tiles on the base level and I want to build (mosaic) my tiles into the rest of the levels required to build a pyramid. As GIS-Jonathan assumes I want to have the lower resolution tiles for zooming out.
^ <- I want these /_\ <- : /___\ <- : /_____\ <- : /_______\ <- I want these /_________\ <- I have this level!
Can this be done using GDAL or similar?
I guess this would be the same as interupting gdal_retile.py just when the lowest level is finished and telling it to continue from the next level. But I don't know if this is possible?