I would like work on analysis of SAR images and optical/multispectral images. Hence I am in need of freely available database of these images. Images of same location should be captured during same time (may be same week or same month).
You can get Sentinel-1 data from scihub.esa. Requires only registration (And most likely, non-commercial use). As Sentinel-1 has just become operational the archive is not very extensive but should grow quite quickly.
You can set request data-access propospal on Alaska Satellite Facility. Some data open access. For ALOS-PALSAR you must be a resident of the United States to receive approval for data access.
You can get data from UNAVCO SAR data archive.
And you can get data from earth.esa.int. To access the data, you must provide a project. To preview scenes, use EOLi esa. ENVISAT ASAR the best option.
You may search and freely download Sentinel 1A data for SAR and Sentinel-2 or Landsat 8 data for Optical for the same area. Temporal resolution could be the issue on this point based upon your purpose. Please check the links below.
https://scihub.copernicus.eu/
https://earthexplorer.usgs.gov/
Also another great website is available for such a reason
https://www.planet.com/pulse/sentinel-2-and-landsat-8-data-now-available-on-the-planet-platform/
Landsat 8 and Copernicus Sentinel-2 data
https://scihub.copernicus.eu/dhus/#/home
In this link you can select the zone and to download the sentinel 1 images, first you must loging
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