RFE2: Difference between revisions

Latest revision as of 17:32, 9 February 2017

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/bin.

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 Tool

Download a little Java tool here for working with the .gz files that RFE2 is packaged in. See the JAVA file for the source-code. Usage:-

 java ExportRFE - shows all the options

 java ExportRFE /series /lon:-15.5 /lat:25.2 /start:20050101 /end:20050228
   will print a list of values for the given location, between the given days.
   add /accmonthly for monthly accumulation and daily average for each month.
   
 java ExportRFE /png /start:yyyymmdd /end:yyyymmdd 
   will produce png file for that range. Add /plain if you don't want any text.
   Add /out:path to specify where the pngs go.
   
 java ExportRFE /tsv /start:yyyymmdd /end:yyyymmdd 
   will produce tab-separated text grids for each day.
   Add /out:path to specify where the pngs go.

Citation

No citation information given - only: "Please refer to this product as the CPC/Famine Early Warning System Daily Estimates". Contact information: Nick Novella, NOAA / NWS / NCEP / Climate Prediction Center, NOAA Center for Weather and Climate Prediction, 5830 University Research Court, College Park, MD 20740, (o) 301.683.3458. E-mail: Nicholas.Novella@noaa.gov

@@ Line 4: / Line 4: @@
 == Getting Access ==
-Completely open access from ftp://ftp.cpc.ncep.noaa.gov/fews/fewsdata/africa/rfe2.
+Completely open access from ftp://ftp.cpc.ncep.noaa.gov/fews/fewsdata/africa/rfe2/bin.
 == File Format ==
@@ Line 35: / Line 35: @@
 == Example Code ==
-=== Java Daily Accumulation ===
+=== Java Tool ===
-Here's Java code to calculate daily precipitation, by summing the CPCs.
+[https://mrcdata.dide.ic.ac.uk/resources/rfe2_java.zip Download] a little Java tool here for working with the .gz files that RFE2 is packaged in. See the JAVA file for the source-code.
- <nowiki>
+Usage:-
-   DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(new File(infile))));
+   java ExportRFE - shows all the options
-  float[] data = new float[691200];
-   for (int record=1; record<=8; record++) {
+   java ExportRFE /series /lon:-15.5 /lat:25.2 /start:20050101 /end:20050228
-     for (int i=0; i<691200; i++)      // Ignore -9999 (no data) - and 3.0* is for 3-hrly mm/hr
+    will print a list of values for the given location, between the given days.
-      data[i]+=(3.0*Math.max(0,dis.readFloat()));
+     add /accmonthly for monthly accumulation and daily average for each month.
-   }
-  dis.close();
+  java ExportRFE /png /start:yyyymmdd /end:yyyymmdd
- </nowiki>
+    will produce png file for that range. Add /plain if you don't want any text.
+    Add /out:path to specify where the pngs go.
+   java ExportRFE /tsv /start:yyyymmdd /end:yyyymmdd
+    will produce tab-separated text grids for each day.
+    Add /out:path to specify where the pngs go.
 == 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.
+No citation information given - only: "Please refer to this product as the CPC/Famine Early Warning System Daily Estimates". Contact information: Nick Novella, NOAA / NWS / NCEP / Climate Prediction Center, NOAA Center for Weather and Climate Prediction, 5830 University Research Court, College Park, MD 20740, (o) 301.683.3458. E-mail:  Nicholas.Novella@noaa.gov
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