From de2906ec3884cf9b3e0d8c1e5a839e3edfd321b7 Mon Sep 17 00:00:00 2001
From: Phil! Gold <phil_g@pobox.com>
Date: Fri, 29 Jun 2012 10:24:49 -0400
Subject: [PATCH] Go back to not using nodata values on the virtual datasets. 
 Doing so only caused problems.

---
 prep_toposm_data | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/prep_toposm_data b/prep_toposm_data
index 8394291..ef6090e 100755
--- a/prep_toposm_data
+++ b/prep_toposm_data
@@ -95,12 +95,11 @@ for y in `seq $BOTTOM $TOP`; do
 done; done
 
 # generate overviews and VRT layers
-pushd . ; cd $HILLSHADE_DIR
-gdalbuildvrt -overwrite all.vrt *.tif
-popd
-pushd . ; cd $HYPSORELIEF_DIR
-gdalbuildvrt -vrtnodata "128 128 128" -overwrite all.vrt *.tif
-popd
+for d in $HILLSHADE_DIR $HYPSORELIEF_DIR ; do
+    pushd . ; cd $d
+    gdalbuildvrt all.vrt *.tif
+    popd
+done
 
 # reproject NLCD data, add overviews, and copy VRT file (with
 # the custom color table).