RFE2

About

This dataset is called "CPC/Famine Early Warning System Daily Estimates", also known as RFE2, Rainfall Estimates. The data are calculated by merging GTS gauge observations and 3 kinds of satellite estimates. (GPI, SSM/I and ASMU).

Getting Access

Completely open access from ftp://ftp.cpc.ncep.noaa.gov/fews/fewsdata/africa/rfe2.

File Format

Pixel resolution	751 x 801
Geographical resolution	0.1º x 0.1º
Longitude range of first pixel	20.0ºW - 55.0ºE
Latitude range of first pixel	40.0ºN - 40.0ºN
Data / units:	mm (per day)
No Data Value:	-999

Each file is a daily total, compressed with gzip. (A simple 7z x using 7-zip from the command-line will unzip it).
2004/07/24 and 2007/11/13 are missing.
Important: the data is ordered in rows starting at the South-most.
And also, there range is supposed to be <300mm. I found some insane values - (1.2E7, 1.1E8, 2005/04/08 and 2005/08/13). Recommendation from NOAA was to apply the 300mm ceiling.

Example Code

Java Daily Accumulation

Here's Java code to calculate daily precipitation, by summing the CPCs.

  DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(new File(infile))));
  float[] data = new float[691200];

  for (int record=1; record<=8; record++) {
    for (int i=0; i<691200; i++)      // Ignore -9999 (no data) - and 3.0* is for 3-hrly mm/hr
      data[i]+=(3.0*Math.max(0,dis.readFloat()));
  }
  dis.close();

Citation

Climate Prediction Center/National Centers for Environmental Prediction/National Weather Service/NOAA/U.S. Department of Commerce. 2015, updated daily. NOAA CPC Morphing Technique (CMORPH) Global Precipitation Analyses Version 0.x. Research Data Archive at the National Center for Atmospheric Research, Computational and Information Systems Laboratory. https://doi.org/10.5065/D60R9MF6. Accessed† dd mmm yyyy. Summary:

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