Dataset Edition

Présentation générale
Nom du jeu de donnéesDaily gridded rain, reference evapotranspiraiton, temperature, relative humidity, global radiation for all Benin 1983-2005 (IMPETUS dataset ID = 370)
Créé le2008-10-01
Projet(s)IMPETUS
Date de début (yyyy-mm-dd)1983-01-01Date de fin (yyyy-mm-dd)2005-12-31
Contact(s)
Data availabilityNo data are currently available for this dataset. Click here to receive an email when this dataset becomes available
Description du jeu de données
RésuméDaily grided 0.1°x0.1° degree longitude/latitude meteorological monitoring estimates based on synoptic observations, and METEOSAT 2 to 7 infra-red images. -Rainfall and global radiaton was derived using METEOSAT infrared images. -Daily maximum and minimum temperatures, relative humidity were derived using 6 synoptic stations and meteosat images. -Reference evapotranspiration was derived using Penman Monteith standard for green grass according to FAO standard using the above meteorologial estimates. Parameter, Attribute list: global radiation, relative humidity, rain, reference evapotranspiration, maximum temperature, minimum temperature. Dataset created by IMPETUS subproject AB1.

Data Lineage: EUMETSAT, GTS/synop archives; Data Consistency: A weakness of the method is the problematic calibration on the infrared sensors on Meteosat 2 to 7. Although both EUMETSAT and ISCCP calibreation was applied to the data, long term biases from sensor to sensor still affected rainfall and global radiation estimates. This was corrected in postprocessing by long term reacalibration with ground obervations (> yearly resolution).; Data Completeness: On days with insufficient satellite data due to system failure, the meteorological etamate of the same hour of the previous day (or most recent day) is used to replace the missing data. This method of missing data substitution conserves long term trends. The original hourly estiamtes are available in dataset 815 to see the data completeness on single days.; Positional Accuracy: No know deficiencies; Data Completeness: Data was validated using independent daily rainfall ground observations from 1983 to 2005, 6 hourly synoptic measuremens, and hourly climate station data in Djougou from 2001 to 2005. Compared to the hourly climate station data, global radiation has a correlation of 0.97, temperatur 0.94, relative humidity 0.94. Due to the high spatiotemporal variability and statistic properties, rainfall estimates show very poor correlation with point measurements at hourly resolution, 0.5 at daily resolution, and 0.8 at monthly and yearly resolution. This makes rainfall the least accurate parameter, but still more accurate than other satellite derived products at the same location. The estimates of reference evapotranpiration showed good correlation with independant ground observations of potential evapotranspiration (using evaporatins vans and surface parameters) in 6 locations, but with significant biases which are believed to be caused by local surface cha! racteristics.
Strategie d'observationDaily set of daily full coverage meteorologial parameters for Benin from 1983 to 2005.
Description de l'instrument
No information available
Paramètres mesurés
Paramètre mesuré 1
Nom du paramètreprecipitation
Mot-clé du paramètreAtmosphere > Precipitation
Unité
Date de début (yyyy-mm-dd)Date de fin (yyyy-mm-dd)
Précision du capteur / Incertitude
Paramètre mesuré 2
Nom du paramètremeteorological measurements
Unité
Date de début (yyyy-mm-dd)Date de fin (yyyy-mm-dd)
Précision du capteur / Incertitude
Information sur l'utilisation des données
Conditions d'utilisation des donnéesPlease inform the Point of Contact if you use the data for publication
Charte d'accès aux donnéesIMPETUS data policy
Base de donnéesIMPETUS
Format des fichiers de donnéesText