One of the finest choices is Landsat imagery from earthexplorer.usgs.gov. Here it’s available for different periods of imageries which we can use environmental changes and deduction.

Hi Seyed,

Try to hunt with:

https://imagehunter.apollomapping.com/

I found a lot of very high res imagery for Iran with the imagehunter.

Success,

Frank

You can download LANDSAT and ASTER images free of charge from: http://earthexplorer.usgs.gov; http://glovis.usgs.gov; http://reverb.echo.nasa.gov

From these websites you can also download a lot of other satellite products.

All Dears, Govindaraj , Frank and Hein thank you so much.

Landsat and ASTER images from (glovis.usgs.gov)

Wow! This is great..Thank you for this contribution...I find it really helpful too

Try to play here as well http://gisgeography.com/best-free-gis-data-sources-raster-vector/

Hi there Seyed,

In my previous thread I forgot to mention the oldest image dataset available (to 50 years back in time and with one optical broadband (Panchromatic photographs from a spy plane). Most of the imagery was taken above the former USSR and the PR of China, but at that time the US considered Iran as a rogue state, so there might be imagery available form Iran. Have a look at the follwoing URL to check and download imagery from the Corona spy lmmission (airborne data of very high resolution

URL: https://lta.cr.usgs.gov/declass_1

See also the following paper to process the Corona imagery:: https://www.researchgate.net/publication/235959317_Diachronic_mapping_of_LUCC_in_the_northwest_of_China_over_the_last_half_century_conversion_of_CORONA_Panchromatic_reflectance_into_LANDSAT_NDVI_imagery

Best personal regards,

Frank

Article Diachronic mapping of LUCC in the northwest of China over th...

earthexplorer.usgs.gov or glovis.usgs.gov actually provides free imageries in different formats for the entire globe.

Did you have any success? I have the same need, can you help me with that?