1. ftp Archive of 6 Hourly data
Full monthly archives of PERSIANN's final 0.25° are available at 6 hourly temporal resolution. To obtain data for each month, just click on the x in the table below.
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6-Hourly README Information
Format:
4-byte binary float from a SUN system (big-endian).
Units: mm/6hr
Spatial coverage is:
50° to -50° lat
0° to 360° long
Spatial Resolution:
0.25° x 0.25° resolution
Geometry:
400 rows x 1440 cols
The data is stored in C style row centric format. with the first value being centered at 49.87
5, 0.125, the second value at 49.875, 0.375, and the last 2 values are centered at: -49.875, 359.625 & -49.875, 359.875
Data are in 4-byte binary float from a SUN system (big-endian). To convert to little endian us
ing fortran please see This link.
Time Stamp:
When extracted using tar and then decompressed , the 6-hrly files will have the follwing names:
raw6hrYYDOYHS.bin
Where
YY : 2 digit year starting from 00 for 2000
DOY: Day of year, (to translate to month/day, please see this link
HS: Starting hour of the 6 hours accumulation period, (0,6,12,18)
for example, the file raw6hr0512518.bin represents the precipitation accumulated bet
ween 18 and 24, on May 5th, 2005
2. ftp Archive of 3 Hourly data
These files are larger than the 6 hourly data since they contain more time units. To obtain the data, please click on the x for each month
| Year |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
| 2012 |
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| 2011 |
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| 2010 |
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3-Hourly README Information
Format:
4-byte binary float from a SUN system (big-endian).
Units: mm/3hr
Spatial coverage is:
60° to -60° lat
0° to 360° long
Spatial Resolution:
0.25° x 0.25° resolution
Geometry:
480 rows x 1440 cols
The data is stored in C style row centric format. with the first value being centered at 59.875, 0.125, the second value at 59.875, 0.375, and the last 2 values are centered at: -59.875, 359.625 & -59.875, 359.875
Data are in 4-byte binary float from a SUN system (big-endian). To convert to little endian using fortran please see This link.
Time Stamp:
When extracted using tar and then decompressed , the files will have the follwing names:
m6s4_3hYYDOYHS.bin
Where:
YY : 2 digit year starting from 00 for 2000
DOY: Day of year, (to translate to month/day, please see this link
HS: Starting hour of the 3 hours accumulation period, (0,3,6,9,12,15,18,21)
for example, the file m6s4_3h0512509.bin represents the precipitation accumulated between 9 and 12, on May 5th, 2005
sample matlab code:
function om = loadbfn(fn,dim,sz)
% loadbfn -- loads a binary file fn of dim
% ([nrows ncols]) of sz 'float','int', etc.
%
% by DKB on 2/5/96
%
if(nargin < 3)
sz = 'float32';
end
f = fopen(fn,'r','b');
if(nargout > 0)
om = fread(f,flipud(dim(:))',sz)';
end
fclose(f);
3. Country Tool
Use this tool to access images for recent precipitation accumulation from PERSIANN global precipitation data set. Start by selecting the desired accumulation period, then select the region, country and push submit button. The tool will launch a page that will provide the requested image for the country and allows access to data.
4. Archive Subsetting Tools
Use this tool to subset data from the PERSIANN 0.25° global precipitation data set. Start by selecting the desired box. Then select the duration (From-To) of the required data and the type of accumulation. You can request all three (Cumulative, daily, and 6 hourly) data. accumulation period, then select the region, country and push the Get Data button. You will receive an email once the data is ready.
Please notice that smaller the box and shorter durations will result in faster processing of your request. If you need a longer duration data for a large area, we recommend obtaining the data from the TAR archive (Please see tool 3 below)
