The PNG maps in this directory are large OpenStreetMap plots of
the whole of Haiti respective the Port-au-Prince region. The files
are updated (roughly) once per hour. World files are provided with
the extension WLD. The projection used is spherical Mercator 
(EPSG:900913 or EPSG:3857).

NOTE: I have had reports that these PNGs do not open in Firefox (but
they do in other web browsers). Maybe that's due to the large size
(15k x 10x pixels approx) - you can always right-click on the link and
use "save link target as..." then open the file with a graphics program.