ETOPO2v2
Global Gridded 2-minute Database

ETOPO2v2c: Cell Centered (pixel registered, where the cell boundaries are lines of even minutes of latitude and longitude, centered on intersections of lines of odd minutes of latitude and longitude).

ETOPO2v2g: Grid Centered (gridline registered, with cell boundaries defined by lines of odd minutes of latitude and longitude, meaning that cells were centered on the integer multiples of 2 minutes [even minutes] of latitude and longitude).

The cell-centered grid is the authoritative version. The grid-centered version was derived from the cell-centered grid and the conversion produces slightly flattened relief.

Download whole world grids in multiple formats:

1. ETOPO2v2c: netCDF, GRD98, raw binary*, HDF, documentation.
2. ETOPO2v2g: netCDF, GRD98, raw binary*, documentation.

* Arc users - use raw binary f4 version & convert from float to raster

Online: Custom grids can be created online from the ETOPO2v2c using NGDC's online Grid Translator

Desktop/Offline: For both cell-centered and grid-centered downloaded grids, custom grids with user-defined bounds can be created in multiple formats, using the desktop version of Grid Translator, part of the free GEODAS Windows Software for Online Downloads and GEODAS XWindows Software.