Nous contacterDataset Edition
| General information | |||
|---|---|---|---|
| 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 |  Original dataset as provided by the Principal Investigator | ||
| 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 | ||
