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I am looking for solar irradiation data for India in a gis format. Like the ones on the link below: http://www.arcgis.com/apps/OnePane/basicviewer/index.html?appid=bf886ca471a54e2c9127a54f60d4ca27

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Second top hit for "solar irradiation data in India" gives this: http://mnre.gov.in/sec/solar-assmnt.htm

There's an online map, data files and also contacts you could talk to. They appear to have been part funded by the U.S. National Renewable Energy Laboratory - who I think are the originators of the ArcGIS link you posted.

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Solar irradiation data can be found and downloaded here: http://www.nrel.gov/international/ra_india.html

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Global Solar Atlas offers raster data as long-term yearly averages (for India calculated for a period 1999-2015) for six parameters (including global horizontal irradiation - GHI, photovoltaic power potential PVOUT, etc.). Data is available as GeoTIFF or ESRI ASCII Grid, 30 arcsec (~1 km) resolution, LatLon WGS84 coordinate system.

Terms is CC BY 3.0 IGO (so kind of free data), copyrighted by The World Bank and provided by Solargis.

Download page http://globalsolaratlas.info/downloads/india or https://solargis.com/maps-and-gis-data/download/india

Data for other countries or global data layers are available to download, too.

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