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The ST_Simplify uses the Ramer–Douglas–Peucker algorithm which takes a user-defined tolerance, then iterates over the geometry object and removes points that fall within the algorithm's criteria + the tolerance. The tolerance is based on your SRID, so if your geometry is in 4326 then the tolerance is in decimal degrees. However, the algorithm doesn't change ...


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In case someone is looking for a solution to the same (or similar problem)...the SRID correct to obtain meters from the reprojection in QGIS is WGS84 UTM Zone 31N.Then it has to change in case you change country to analyze: check here to find out the correct time zone for each country http://www.dmap.co.uk/utmworld.htm



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