Fixed issue with duplicate artificial waypoints.

albar965/littlenavmap#462

Author: albar965

resources/sql/fs/db/dfd/populate_navaids_proc.sql

@@ -151,11 +151,18 @@ from (
 -- **********************************************************
 -- Now delete all waypoints which already exist in the waypoint table
 
+-- Delete all duplicate waypoints that are at the same position having same name, region and type
+-- 1 deg manhattan distance about 60-100 nm at the equator
 delete from waypoint_temp where waypoint_id in (
-select w1.waypoint_id from waypoint_temp w1
-join waypoint w2 on  w1.ident = w2.ident and
-  w1.region = w2.region and
-  (abs(w1.lonx - w2.lonx) + abs(w1.laty - w2.laty)) < 0.00000001);
+  select distinct w1.waypoint_id
+  from waypoint_temp w1
+  join waypoint_temp w2 on  w1.ident = w2.ident and w1.region = w2.region and w1.type = w2.type
+  where w1.waypoint_id < w2.waypoint_id and (abs(w1.lonx - w2.lonx) + abs(w1.laty - w2.laty)) < 0.00000001);
+
+delete from waypoint_temp where waypoint_id in (
+  select w1.waypoint_id from waypoint_temp w1
+  join waypoint w2 on  w1.ident = w2.ident and w1.region = w2.region and w1.type = w2.type
+  where (abs(w1.lonx - w2.lonx) + abs(w1.laty - w2.laty)) < 0.00000001);
 
 -- **********************************************************
 -- Copy all waypoints from temp table to waypoint table