CHIRPS FAQ - Revision history

Daniella: /* Who do I contact with CHIRPS2 questions? */

2026-09-20T20:19:13Z

Who do I contact with CHIRPS2 questions?

Daniella at 20:18, 20 September 2026

2026-09-20T20:18:26Z

Daniella: /* How do I reference CHIRPS in publications? */

2026-09-20T20:14:47Z

How do I reference CHIRPS in publications?

Daniella at 20:14, 20 September 2026

2026-09-20T20:14:00Z

Daniella at 20:11, 20 September 2026

2026-09-20T20:11:57Z

Daniella: /* How was CHIRPS funded? */

2026-01-15T22:33:45Z

How was CHIRPS funded?

Pete: /* Via anonymous ftp */

2023-09-18T15:54:49Z

Via anonymous ftp

Pete: /* What are some of the changes in version 1.8? */

2023-09-18T15:53:24Z

What are some of the changes in version 1.8?

Pete: /* What is the spatial density of station data used in CHIRPS? */

2023-09-18T15:51:39Z

What is the spatial density of station data used in CHIRPS?

Pete: /* What is the spatial density of station data used in CHIRPS? */

2023-09-18T15:47:09Z

What is the spatial density of station data used in CHIRPS?

@@ Line 101: / Line 101: @@
 ==Who do I contact with CHIRPS2 questions?==
-[[User:Pete| Pete Peterson]]
+[[User:Help| Help]] [mailto:chc-help@geog.ucsb.edu chc-help@geog.ucsb.edu]
-[mailto:pete@geog.ucsb.edu pete@geog.ucsb.edu]
+[[User:Pete| Pete Peterson]] [mailto:pete@geog.ucsb.edu pete@geog.ucsb.edu]

@@ Line 15: / Line 15: @@
   CHIRPSv2.0: http://chc.ucsb.edu/data/chirps/ #Points to data webpage, see [https://data.chc.ucsb.edu/products/CHIRPS-2.0/ Data section] for download
-==What is the spatial resolution of CHIRPS?==
+==What is the spatial resolution of CHIRPS2?==
 *Chirps is produced at 0.05 x 0.05 degree spatial resolution.
 *For daily Africa data we also provide a 0.25 x 0.25 degree spatial resolution product.
-==What are the spatial domain available for CHIRPS?==
+==What are the spatial domain available for CHIRPS2?==
 *Global        50N-50S, 180W-180E   @0.05 deg resolution = maps 7200 x 2000 pixels
 *Africa        40N-40S,  20W- 55E   @0.05 deg resolution = maps 1500 x 1600 pixels
@@ Line 25: / Line 25: @@
 *WHem          50N-50S, 125W- 34W   @0.05 deg resolution = maps 1820 x 2000 pixels
-==What are the time steps available for CHIRPS?==
+==What are the time steps available for CHIRPS2?==
 *daily
 *[[#How does CHIRPS define a pentad?| pentad]]
@@ Line 34: / Line 34: @@
 *annual
-===How does CHIRPS define a pentad?===
+===How does CHIRPS2 define a pentad?===
 *6 pentads = 1 calendar month. Each of first 5 pentads in a month have 5 days. The last pentad contains all the days from the 26th to the end of the month.
-===How does CHIRPS define a dekad?===
+===How does CHIRPS2 define a dekad?===
 *A dekad = sum of 2 pentads. There are 3 dekads in a calendar month.
-==What are the file formats available for CHIRPS?==
+==What are the file formats available for CHIRPS2?==
 *.tif
 *.bil
@@ Line 57: / Line 57: @@
 ==What is the temporal range for CHIRPS2?==
 CHIRPS2 is available from 1981 to near-real time.
 ==What is the spatial density of station data used in CHIRPS2?==
@@ Line 81: / Line 75: @@
 *the National Aeronautics and Space Administration (NASA)  and
 *the National Oceanic and Atmospheric Administration (NOAA)
 ==How good is CHIRPS2?==
@@ Line 107: / Line 99: @@
 ==What are the production changes for CHIRPS2?==
 As of January 2025, version 3 of CHIRPS is available to the public. Production of CHIRPS v2 will continue in parallel through 2026 to support ongoing applications during the transition to CHIRPS v3.

@@ Line 87: / Line 87: @@
 For its intended uses, Seasonal Drought monitoring and Trend Analysis, it is very good; see [ftp://chg-data-out.chc.ucsb.edu/pub/org/chg/people/AGU-Fall.2014.presentations/AGU.2014.pete_peterson.final.pptx]
-==How do I reference CHIRPS in publications?==
+==How do I reference CHIRPS2 in publications?==
 Funk, C.C., Peterson, P.J., Landsfeld, M.F., Pedreros, D.H., Verdin, J.P.,
 Rowland, J.D., Romero, B.E., Husak, G.J., Michaelsen, J.C., and Verdin, A.P.,

@@ Line 5: / Line 5: @@
 ===Via a web browser===
   http://data.chc.ucsb.edu/products/CHIRPS-2.0/
 ===Via anonymous ftp===

@@ Line 1: / Line 1: @@
-==Is there a CHIRPS website?==
+==Is there a CHIRPS2 website?==
 Yes: https://chc.ucsb.edu/data/chirps
-==Where can I get CHIRPS data?==
+==Where can I get CHIRPS2 data?==
 ===Via a web browser===
   http://data.chc.ucsb.edu/products/CHIRPS-2.0/
@@ Line 49: / Line 49: @@
 *.netcdf
-==What units is CHIRPS in?==
+==What units is CHIRPS2 in?==
 Total mm for given time step, mm/pentad, mm/month, etc.
@@ Line 55: / Line 55: @@
 -9999.
-==What is the latency of the CHIRPS product?==
+==What is the latency of the CHIRPS2 product?==
 *There is a rapid (GTS and Mexico only) CHIRPS available 2 days after the end of a pentad.
 *Final CHIRPS (all station data) is available sometime in the third week of the following month.
-==What is the temporal range for CHIRPS?==
+==What is the temporal range for CHIRPS2?==
-CHIRPS is available from 1981 to near-real time.
+CHIRPS2 is available from 1981 to near-real time.
-==Who do I contact with CHIRPS questions?==
+==Who do I contact with CHIRPS2 questions?==
 [[User:Pete| Pete Peterson]]
@@ Line 68: / Line 68: @@
-==What is the spatial density of station data used in CHIRPS?==
+==What is the spatial density of station data used in CHIRPS2?==
 The closest thing we have available is what we call "reality checks" we post in EWX (Early Warning Explorer).
@@ Line 79: / Line 79: @@
 **You can zoom in on a location, then cycle through month/years to see how the number of stations changes with time. It is pretty significant in some areas.
-==How was CHIRPS funded?==
+==How was CHIRPS2 funded?==
-CHIRPS has been supported by funding from:
+CHIRPS2 has been supported by funding from:
 *the U.S. Agency for International Development (USAID)
 *the Famine Early Warning Systems Network (FEWS NET)
@@ Line 86: / Line 86: @@
 *the National Oceanic and Atmospheric Administration (NOAA)
-==Who uses CHIRPS?==
+==Who uses CHIRPS2?==
-==How good is CHIRPS?==
+==How good is CHIRPS2?==
 For its intended uses, Seasonal Drought monitoring and Trend Analysis, it is very good; see [ftp://chg-data-out.chc.ucsb.edu/pub/org/chg/people/AGU-Fall.2014.presentations/AGU.2014.pete_peterson.final.pptx]
@@ Line 101: / Line 101: @@
 *[http://tinyurl.com/chg-chirps/docs/USGS-DS832.CHIRPS.pdf CHG-local source ]
 *[http://pubs.usgs.gov/ds/832/ USGS website ]
 ==What are some of the changes in version 2.0?==
@@ Line 117: / Line 107: @@
 *NetCDF format added
 *Replaced erroneous stations in Tanzania
-*Expanded diagnostics, stations by Country plots, EWX rchecks, station comparison/*badness* plots, station density maps, pentad and monthly png's of excluded stations,
+*Expanded diagnostics, stations by Country plots, EWX rchecks, station comparison/*badness* plots, station density maps, pentad and monthly png's of excluded stations.

@@ Line 11: / Line 11: @@
 ===Via anonymous ftp===
-  ftp chc-data-out.chc.ucsb.edu
+  ftp ftp.chc.ucsb.edu
   username: anonymous
   password: your_email_address

← Older revision		Revision as of 15:53, 18 September 2023
Line 118:		Line 118:
	*Replaced erroneous stations in Tanzania		*Replaced erroneous stations in Tanzania
	Expanded diagnostics, stations by Country plots, EWX rchecks, station comparison/badness* plots, station density maps, pentad and monthly png's of excluded stations,		Expanded diagnostics, stations by Country plots, EWX rchecks, station comparison/badness* plots, station density maps, pentad and monthly png's of excluded stations,
−
−	~~==What are some of the changes in version 1.8?==~~
−	*Zambia was a mess in v1.7 due to accidentally ingesting temperature data as rainfall in our database. This has been fixed.
−	*Pixels near the coastline would alternate between data and bad value over time in v1.7. This has been fixed.
−	*Reran CHIRP from May 2013 through October 2013 to fix problem.
−	*Deleted 251 bad stations from our database.
−	*Fixed another 660 stations with incorrect lat, long and/or country information.
−	*Separated Sudan into Sudan and South Sudan stations.
−	*Reduced the number of anchor stations used to merge station data from ~91k to ~50k. The reduced stations had little/no data.
−	*Added thousands of stations in Colombia, Brazil, Panama and India.
−	*Re-factored and re-organized entire code base to be more streamline and less error prone.
−	*Include browse images for Africa

@@ Line 79: / Line 79: @@
 **You can zoom in on a location, then cycle through month/years to see how the number of stations changes with time. It is pretty significant in some areas.
-Also, ftp://chc-data-out.chc.ucsb.edu/pub/org/chg/products/CHIRPS-latest/qc/stations_used/monthly/:
+Also, ftp://ftp.chc.ucsb.edu/pub/org/chg/products/CHIRPS-latest/qc/stations_used/monthly/:
 *Each file represents a single month of CHIRPS for the Globe.
 *There are 5 columns