srtm15

1) WORLD - no need for single beam data.  Only use the following
Use the following
/public/CCOM , JAMSTEC, NOAV, NOAA, SIO (need SIO badlist), SIO_multi, US_multi
/public/lakes

/private/3DGBR, GEBCO (except gebco972.cm, gebco_contours.cm) 

2) ARCTIC - don't use ANY cm-bathymetry in IBCAO areas north of 69-70

3) build a lake mask

4) exclude ICESAT data and rely on srtm30 grid in Antarctica and Greenland
or
Try aster over these ice areas.

5) new Antarctic grounding line
http://nsidc.org/data/docs/agdc/nsidc0489_bindschadler/index.html

6) copied missing ASTER DEM files in Arctic