Ag Data Commons

File(s) stored somewhere else

Please note: Linked content is NOT stored on Ag Data Commons and we can't guarantee its availability, quality, security or accept any liability.

SGP97 GCIP/EOP Surface: Precipitation NCEP/EMC 4KM Gridded Data (GRIB) Multi-Sensor Analysis (MUL) <-2001

posted on 2023-11-30, 08:39 authored by Long-Term Agroecosystem Research - LTAR, Southern Plains

The Southern Great Plains 1997 (SGP97) Hydrology Experiment originated from an interdisciplinary investigation, "Soil Moisture Mapping at Satellite Temporal and Spatial Scales" (PI: Thomas J. Jackson, USDA Agricultural Research Service, Beltsville, MD) selected under the NASA Research Announcement 95-MTPE-03. The Global Energy and Water Cycle Experiment (GEWEX) Continental-scale International Project (GCIP) Enhanced Observing Period (EOP) takes place in the Mississippi River basin, which provides a number of watershed areas that are potentially useful for hydrologic focused studies. The temporal coverage for this dataset is as follows: Begin datetime: 1996-07-09 00:00:00, End datetime: 2001-12-31 23:59:59. This dataset contains the National Centers for Environmental Prediction (NCEP) Environmental Modeling Center (EMC) 4 KM GRIB multi-sensor analysis ("MUL") data. A prototype, real-time, hourly, multi-sensor National Preciptation Analysis (NPA) has been developed at NCEP in cooperation with the Office of Hydrology (OH). This analysis merges two data sources that are currently being collected in real-time by OH and NCEP. Hourly digital precipitation (HDP) radar estimates are created by the WSR-88D Radar Product Generator on a 131 X 131 4-km grid centered over each radar site. Data analysis routines, including a bias correction of the radar estimates using rain gage data, have been adapted by NCEP on a national 4-km grid from algorithms developed by OH and executed regionally at NWS River Forecast Centers (RFC). This dataset only contains the NCEP 4 KM GRIB Data multi-sensor hourly, 6-hourly, and daily analysis (gage and unbiased radar). 6-hourly data are generally available at 00Z, 06Z, 12Z, and 18Z. Daily data are generally available at 12Z. Depending on the time period selected, all three datasets may or may not be available. Other NCEP 4 KM GRIB Data including gage-only analysis, radar estimate, radar estimate after bias removal, and gage-only analysis using 24h accumulated ("RFC") data are available as independent datasets. Depending on the time period selected, all five types may or may not be available. Please see GCIP/EOP: Surface NCEP Ancillary Catalogue of Available GCIP Precipitation Data (NCEP/EMC). The format of the files is GRIB. The files are compressed using the UNIX "compress" command and "uncompress" must be used before decoding.

Resources in this dataset:


Agricultural Research Service

National Science Foundation


Data contact name

EOL Data Support

Data contact email


National Center for Atmospheric Research / Earth Observing Laboratory

Intended use

The GCIP scientific objectives are 1) Document the time-space variability of the hydrological and energy budgets at a continental-scale; 2) Develop and validate macro-scale land surface hydrologic models, related high resolution atmospheric models, and coupled hydrologic-atmospheric models; 3) Develop and validate information retrieval schemes incorporating existing and future satellite observations combined with enhanced ground-based observations; and 4) Provide a capability to translate the effects of a future climate change into impacts on water resources on a regional basis.

Use limitations

This dataset is provided as is and was not quality controlled by UCAR/JOSS.

Temporal Extent Start Date


Temporal Extent End Date



  • Not specified

Geographic Coverage


ISO Topic Category

  • environment
  • farming

Ag Data Commons Group

  • Southern Plains
  • Long-Term Agroecosystem Research

National Agricultural Library Thesaurus terms

soil water; satellites; Maryland; Agricultural Research Service; energy; hydrologic cycle; watersheds; Mississippi River; data collection; prediction; radar; rain; algorithms; rivers; computer software; hydrologic models; information retrieval; climate change; water resources

OMB Bureau Code

  • 005:18 - Agricultural Research Service

OMB Program Code

  • 005:040 - National Research

Pending citation

  • No

Public Access Level

  • Public

Preferred dataset citation

Long-Term Agroecosystem Research - LTAR; Southern Plains (2021). SGP97 GCIP/EOP Surface: Precipitation NCEP/EMC 4KM Gridded Data (GRIB) Multi-Sensor Analysis (MUL) <-2001. National Center for Atmospheric Research / Earth Observing Laboratory.