diff --git a/MTM/task4-straipsnis/init.sql b/MTM/task4-straipsnis/init.sql
index a9211a6..f5734fd 100644
--- a/MTM/task4-straipsnis/init.sql
+++ b/MTM/task4-straipsnis/init.sql
@@ -15,7 +15,7 @@ CREATE TABLE airports (
     tz TEXT,
     type TEXT,
     source TEXT,
-    CONSTRAINT enforce_dims_geom CHECK (st_ndims(geom) = 2),
+    CONSTRAINT enforce_dims_geom CHECK (st_ndims(geom) = 3),
     CONSTRAINT enforce_geotype_geom CHECK (geometrytype(geom) = 'POINT'::text OR geom IS NULL),
     CONSTRAINT enforce_srid_geom CHECK (st_srid(geom) = 4326)
 );
@@ -23,6 +23,12 @@ CREATE TABLE airports (
 -- import data from airports.dat
 \copy airports(gid, name, city, country, iata, icao, latitude, longitude, altitude, timezone, dst, tz, type, source) FROM 'airports.dat' DELIMITERS ',' CSV;
 
--- put lat/lon to the real GIS "geom" field
+-- put lat/lon/altitude to the "real" geom field
 UPDATE airports
-SET geom = ST_SetSRID(ST_Point(longitude, latitude),4326);
+SET geom = ST_SetSRID(ST_MakePoint(longitude, latitude, altitude * 0.3048),4326);
+
+ALTER TABLE airports DROP COLUMN latitude;
+ALTER TABLE airports DROP COLUMN longitude;
+ALTER TABLE airports DROP COLUMN altitude;
+ALTER TABLE airports DROP COLUMN type;
+ALTER TABLE airports DROP COLUMN source;