Annual map of Direct Normal Irradiance kWh/m2 Vietnam 1km 2003-2012 WBG

Direct normal irradiance (DNI) measures the solar radiation received by a surface held perpendicular to the sun's rays. This quality of solar irradiation is of interest to concentrating solar thermal stations and those that track the movement of the sun. The map is an un-validated, satellite-derived estimate of averaged irradiance, and was created by CIEMAT, CENER and IDAE.The map is an un-validated, satellite-derived estimate. As part of phase II of the WBG initiative, these maps will be validated through the use of ground measurement data, and until the data collection period is finished should be considered for policy use, rather than energy prospecting, following IRENA's classification of renewable energy data. For complete terms of use, please visit http://globalatlas.irena.org/terms_wbg_esmap.aspx . For full metadata, reports, and data download, please visit http://www.esmap.org/re_mapping_vietnam