Sarthak agarwal

yes we should and name is `csystem`

yes and defalut value should the coordinate system we are using currently

we use longitudes and lattitudes from the osm file geographic coordinate system

that I dont know but boost.geomtery supports these coordinate systems - cartesian - spherical - spherical_equatorial - geographic

OSM uses WGS84 http://wiki.openstreetmap.org/wiki/Converting_to_WGS84