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Could anyone provide a site to download NDVI images or raw satellite images of Sri Lanka (Asia) for free for me to calculate the NDVI.

  • Have you tried to download Landsat imagery? Where else are you stuck? – Devdatta Tengshe May 12 '15 at 10:27
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For high spatial resolution, you can download Sentinel-2 data. It has worldwide cover every ten (very soon 5) days. You have 10 meter bands in Red and NIR, so you can compute ten meter NDVI (vs 30 m with Landsat). Make sure that you use the L2A images (radiometrically corrected with SEN2COR) in order to compute a meaningfull NDVI value from the "Top of Canopy" reflectance (NIR-Red)/(NIR+Red).

Primary download site for Sentinel

https://scihub.copernicus.eu/dhus/#/home

alternative solutions can be found on Where / How to download Sentinel 2 Images

If you are more interested in the temporal resolution than in the spatial resolution, daily images are available from Sentinel-3 (soon), PROBA-V or MODIS. Again, I recommend using TOA (level2) images.

PROBA-V : http://aida.vgt.vito.be/content/products

MODIS (and also Landsat, but for Landsat only you could use Libra as mentioned by @Richard Law): https://earthexplorer.usgs.gov/

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Libra provides a really intuitive interface to obtain Landsat imagery according to various spatial, temporal and image-suitability filters. I highly recommend it over EarthExplorer.

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You can try USGS http://www.usgs.gov/. You can create an account for free and then through Earth Explorer http://earthexplorer.usgs.gov/ you can search and download images from different satellites (e.g Landsat).

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Unless you state specific requirements there's a whole number of satellite missions that provide free raw/NDVI imagery. Some examples are:

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