Shift in data by approximately one half a cell

[Jawoo]

It was reported that the lower left coordinates (xll & yll) provided
in the header portion of the ASCII data download files are incorrect
resulting in a negative shift in the data of approximately one half a
cell.

To correct this, before converting the ASCII file to a raster, change
the xll corner value to -159.834657 and the yll corner to -55.472909.
The ASCII files can be manually edited using a text editor program of
your choice and then saved as .txt files.

To correct any data surfaces that have already been imported: in
ArcMap, use Data Management Tools, Projections and Transformations,
Raster, Shift with the shift values of +0.040327 for the x value and
-0.014459 for the y value.

This problem will be corrected in the next full run of the model.

[Jawoo]

*UPDATE*

The correct xll and yll corner values are -159.8333 and -55.5000,
respectively. This has been fixed for the new release v3r2 - you can
download the corrected data files from the MapSPAM website (http://
mapspam.info/download-data). Since the change is not really visible at
global/regional scale, the map image files were not updated yet. Sorry
for any inconvenience it might have caused..

Thanks,
Jawoo (on behalf of the Team SPAM)