GPCC First Guess Product

Format of each File:

row #1	number of rows to seek/skip over;
row #2	gridsize ° (1.0)
row #3	area °
row #4	month and year
row #5	separator =======
row #6	data description of column 1, gpcc analysis, first guess product
row #7	data description of column 2, number of gauges per grid
row #8	separator =======
row #9 to End-Of-File	2 columns of data (representing the value of a gridbox (center) with size GG * GG)  Format F9.2,1x,F9.2

Example of 1.0 ° data for Jan 2012

8          : rows to seek over
Grid    : 1.00000
Area    : -180.000000 180.000000 -90.000000 90.000000
Month : 01 2012
===================
column 1          : GAUGE ANALYSIS SPHEREMAP FIRST GUESS (first guess product)
column 2          : GGAUGE ANALYSIS SPHEREMAP FIRST GUESS (number of gauges per grid)
===================
-99999.99      0.00
-99999.99      0.00
-99999.99      0.00
-99999.99      0.00
:
:
:

Relation of rows and gridcells:

Example for 2.5 ° grids

144 * 72 = 10368 gridcells, row #1(+8 headerlines) to #10368(+8 headerlines)
 

row	gridcell	centre coordinates
#9	1	-178,75°W / +88,75°N
#152	144	+178,75°E / +88,75°N
#10233	10225	-178,75°W / -88,75°S
#10376	10368	+178,75°E / -88,75°S

The following table shows the global gridsystem

-180/+90 (West/North)

+180/+90 (East/North)

 

1	2	3	4	...	144
145	146	147	148	...	288
:	:	:	:	:	:
10225	10226	10227	10228	...	10368

 

-180/-90 (West/South)

+180/-90 (East/South)

 

1.0 ° Grid is similar to the system as shown above, but:

360 * 180 = 64800 gridcells, row 1(+8) to 64800(+8)