and others, here and in other web sites. Nowhere I can find which SRID to use for calculating the distance in meters. My area of interest is the World...anyone please can help me??
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