Hello,
GIS newbie here. Please feel free to bump my question into the right sub forum if it does not fit in here. If I choose Eurasia as my grid from here - http://dds.cr.usgs.gov/srtm/version2_1/Documentation/Continent_def.gif how to determine the grid cell that represents the south west direction i.e. south of the southern most point AND west of the western most point. Is this done by human inspection(trial and error) or some algorithm there than do it ?