childsprite {

            sprite: GROUNDSPRITE_SNOW_4_4;

            recolour_mode: RECOLOUR_REMAP;

            palette: PALETTE_USE_DEFAULT;

            always_draw: 1;

            hide_sprite: (climate != CLIMATE_ARCTIC) || (climate == CLIMATE_ARCTIC) && (nearby_tile_height(0, 0) < (snowline_height + 2));

        }