--SELECT round(st_area(ST_SetSRID(st_extent(pos), 4326)::geography)/100)/100 as areal_ha

select st_astext(st_simplify(st_union(st_buffer(pos, 0.00003)), 0.0000005)), round(st_area(ST_SetSRID(st_simplify(st_union(st_buffer(pos, 0.00003)), 0.0000005), 4326)::geography)/100)/100
FROM harvest.nya_skolevangen_2017;