Files in this archive are grid files exported using gridascii command in ArcInfo (signified by the ga_ prefix in file names).
Spatial extent = pantropic delineation
Resolution = 30-minute (0.5 dd) except where noted.
Projection = geographic

ptrop_basins_30min = basin ids
ptrop_ids = unique cell ids which correspond to ptrop_id in WBM_lc_by_scenario dbf files.
ptrop_network_30m = flow direction grid
avg_precip_mm = long-term annual average precipitation (in mm)
ptrop_fldpln_6min = simulated floodplains, resolution = 6-minute (0.1 dd)
ptrop_ls02pop_30min = LandScan 2002 population with pantropical domain.
ptrop_ls02pop_on_fldpln_30min = LandScan 2002 population that coincides with ptrop_fldpln_6min, aggregated to 30-min.