Runoff Field Data Structures

In this directory there is one annual and 12 monthly climatological runoff fields. 
The fields are composite monthly runoff. 

The naming convention is cmp_<continent abbreviation>_ro<month>.grd 

The <continent abbreviation> represents:

afr -> Africa
asi -> Asia
aus -> Australasia
eur -> Europe
nam -> North America
sam -> South America

The <month> represents:
01 -> January
02 -> February
03 -> March
04 -> April
05 -> May
06 -> June
07 -> July
08 -> August
09 -> September
10 -> October
11 -> November
12 -> December

The file format is ARC/INFO ASCII grids.

For Africa:
ncols         152
nrows         164
xllcorner     -20
yllcorner     -40
cellsize      0.5
NODATA_value  -9999
-9999 -9999 -9999-9999 -9999 -9999 -9999 -9999 -9999 ...

...

where

ncols       -    number of columns
nrows       -    number of rows
xllcorner   -    horizontal coordinate of the lower left corner
yllcorner   -    vertical coordinate of the lower left corner
cellsize    -    cell size
NODATA      -    missing data value


The monthly runoff values are given in mm/mo at 30-minute (0.5 degree)
spatial resolution. The annual values are given in mm/yr.