From e0526e4182b52f44a2d9d014c197f69e8f5ca464 Mon Sep 17 00:00:00 2001
From: artemp <artem@mapnik.org>
Date: Tue, 22 Mar 2016 10:41:50 +0100
Subject: [PATCH] Update TWKB howto

---
 TWKB-HOWTO.md | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/TWKB-HOWTO.md b/TWKB-HOWTO.md
index 3a4bfe304..20b23065f 100644
--- a/TWKB-HOWTO.md
+++ b/TWKB-HOWTO.md
@@ -1,4 +1,4 @@
-### Direct TWKB 
+### Direct TWKB
 #### Prerequisites
 
 * Standard set of planet OSM tables imported into PostgreSQL with `osm2pgsql` or similar.
@@ -11,6 +11,9 @@ alter table planet_osm_polygon_twkb add column twkb bytea;
 update planet_osm_polygon_twkb set twkb = ST_AsTWKB(way, 2);
 alter table planet_osm_polygon_twkb drop column way;
 ```
+*NOTE: `update planet_osm_polygon_twkb set twkb = ST_AsTWKB(way, 2);` should be using `ST_AsTWKB(ST_Simplify(ST_RemoveRepeatedPoints(way, <tolerance>),<tolerance>),2)`
+`
+
 #### Spatial index
 
 ```sql
@@ -23,4 +26,3 @@ create index planet_osm_polygon_twkb_index on planet_osm_polygon_twkb using GIST
 VACUUM FULL ANALYZE VERBOSE planet_osm_polygon_twkb ;
 \d+
 ```
-