Dataset Edition

General information | |||
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Dataset name | MULTI-SAT - EPSAT-SG - Surface Rainrate - West Africa - 0.1 | ||
Data type | ATMOSPHERE | ||
Created on | 2016-11-28 | ||
Useful in the framework of | OPERATIONAL-DATA | ||
Dataset Contact(s) | |||
Data access | ![]() | ||
History | ISSUE2016-11-29 | ||
Purpose | The EPSAT-SG method developed at LMD within the framework of AMMA combines MSG, TRMM precipitation radar (PR) and GPCP-1dd data. In a first stage, rainfall probabilities are computed from MSG multi-spectral data and from coinciding TRMM-PR data through a feed forward neural network. A "rainfall probability map" is then produced for each quarter-an-hour MSG image. In a second stage, daily rainfall efficiency maps are computed merging GPCP-1dd information with the probabilities using a rescaling procedure. Eventually combining efficiencies and probabilities data derives rainfall amount estimates. The EPSAT-SG estimates are thus produced with the MSG very high space and time resolution (3 kilometers and 15 minutes). However, in order to have a reasonable accuracy and to fit the final-user resolution requirements, the rainfall estimates are integrated on appropriate scales to provide the final EPSAT-SG product.
Validation CAUTION : This product has only been validated for 10-Day periods and 0.5°x0.5° space resolution. Using these estimates with finer resolutions may increase notably the estimation biases. Preliminary results of the Precip-AMMA satellite rainfall estimates evaluation can be found here. A specific validation of the EPSAT-SG product can be found here. A presentation of the EPSAT-SG product can be found here. Projection: The original EPSAT-SG product is presented in the satellite MSG projection. It has been put in the geographical lat/lon projection (plate-carrée) with a grid step equal to 0.1° and a time step of 30 minutes. The West_Africa area covers the zone from 25° West to 25° East, and from 5° South to 20° North. The pixels of the grids are located by the coordinates of their center. Units: The units are mm/30 minutes. This has to be considered as an average rainfall amount value in each 0.1° grid cell. | ||
Instrument | |||
Satellite | MULTI-SAT | ||
Instrument | EPSAT-SG | ||
Instrument type | |||
Parameters | |||
Parameter name | Surface Rainrate | ||
Parameter keyword | Atmosphere > Precipitation | ||
Unit | millimeter - mm | ||
Coverage | |||
Temporal Coverage | |||
Date begin | 2004-06-01 | Date end | 2006-09-30 |
Geographic Coverage | |||
Area name | West Africa | ||
West bounding coordinate (°) | -25 | East bounding coordinate (°) | 25 |
North bounding coordinate (°) | 20 | South bounding coordinate (°) | -5 |
Data resolution | |||
Temporal resolution | 0000-00-00 00:30:00 | ||
Latitude resolution | 0.1 | ||
Longitude resolution | 0.1 | ||
Data use information | |||
Use constraints | See AMMA data policy. | ||
Data policy | AMMA data policy | ||
Data format(s) | NetCDF |