30 arc-second DEM for Antarctica

PLEASE NOTE: This is a beta release of the Antarctica DEM. If any data
anomalies are noticed, please send an E-mail to either Mike Oimoen at:
[e-mail], or Sue Jenson at: [e-mail].
We will look into them, and they may be addressed in the next release.

The Antarctica data is provided in two projections.
Antarctic DEM in geographic (lat/lon) coordinates: 30 arc-second spacing
-ant_dem_lkms1 UL = 180 W, 60S. LR = 90W, 90S (3600 rows x 10800
columns)
-ant_dem_lkms2 UL = 90 W, 60S. LR = 0W, 90S (3600 rows x 10800 columns)
-ant_dem_1kms3 UL = 0 W, 60S. LR = 90E, 90S (3600 rows x 10800 columns)
-ant_dem_1kms4 UL = 90 E, 60S. LR = 180E, 90S (3600 rows x 10800 columns)

Antarctic DEM in polar stereographic coordinates (meters)
-ant_dem_1kmps UL = -2700000 x 2699000. LR = 2699000 x -2700000 (5400 rows x
5400 columns)

Note: Both DEMs are referenced to the WGS84 ellipsoid. The standard latitude of
the polar stereographic DEM is 71S, and it central meridian is 0.

Data Organization: Data are distributed as 16-bit straight raster image files
in a latitude/ longitude coordinate system, and also in a polar stereographic
coordinate system.

Image files are identified by the .bil.gz extension. Each image file of the
Antarctica data set is compressed using the GNU "gzip" utility. If you do not
have access to gzip, the FTP server will uncompress the file as you retrieve
it. To do this, simply leave off the ".gz" extension when retrieving the file
(NOTE: This option is not available through MOSAIC). For example, to retrieve
the file "af_1k_dem1.bil.gz" without compression just use "get
af_dem_lks1.bil". Note that the uncompressed files are typically five times
larger than the compressed versions and so will take five times longer to
transmit. The gzip program is available via anonymous FTP at the following
sites: prep.ai.mit.edu:/pub/gnuwuarchive.wustl.edu:/systems/gnu

Each image file is accompanied by five ancillary files (header file, world
file, statistics file, coordinate file, and data descriptor
record ). The format of each ancillary file is described below: