diff --git a/get-datafiles-northamerica.sh b/get-datafiles-northamerica.sh
deleted file mode 100755
index a425cb9..0000000
--- a/get-datafiles-northamerica.sh
+++ /dev/null
@@ -1,22 +0,0 @@
-#!/bin/sh
-
-# get the SRTM data files and convert them for splat use
-# results in ~3.6 GB disk space consumed
-
-# License: Public domain / CC-0
-
-# for state/county borders -- US only.
-BORDERDIR=splat-datafiles/borders/
-
-BORDERURL="https://web.archive.org/web/20130331144934/http://www.census.gov/geo/cob/bdy/co/co00ascii/co99_d00_ascii.zip"
-
-mkdir -p $BORDERDIR
-cd $BORDERDIR
-echo "retrieving state/county borders.."
-wget -N -nv $BORDERURL
-echo "unpacking state/county borders.."
-unzip -o *.zip
-cd -
-
-./get-datafiles.sh "North_America"
-
diff --git a/get-datafiles-world.sh b/get-datafiles-world.sh
index f80c60e..e760935 100755
--- a/get-datafiles-world.sh
+++ b/get-datafiles-world.sh
@@ -1,12 +1,88 @@
 #!/bin/sh
 
+# get the SRTM data files and convert them for splat use
+
 # License: Public domain / CC-0
 
-./get-datafiles-northamerica.sh
-./get-datafiles.sh "South_America"
-./get-datafiles.sh "Africa"
-./get-datafiles.sh "Eurasia"
-./get-datafiles.sh "Australia"
-./get-datafiles.sh "Islands"
+# path to topgraphy datafiles
+TOPOFILEDIR=splat-datafiles/sdf/
+# local hgt file archive
+HGTFILEDIR=splat-datafiles/hgtzip/
+
+if [ ! -x `which srtm2sdf` ]; then
+  echo "error: not found in path: srtm2sdf splat conversion utility"
+  exit 1
+fi
+
+if [ ! -x `which readlink` ]; then
+  echo "error: not found in path: readlink"
+  exit 1
+fi
+
+if [ ! -x `which wget` ]; then
+  echo "error: not found in path: wget"
+  exit 1
+fi
+
+if [ ! -x `which unzip` ]; then
+  echo "error: not found in path: unzip"
+  exit 1
+fi
+
+if [ ! -x `which bzip2` ]; then
+  echo "error: not found in path: bzip2"
+  exit 1
+fi
+
+echo "Please sign up for a NASA Earthdata account at: \nhttps://urs.earthdata.nasa.gov/users/new"
+read -p 'NASA Earthdata Username: ' NASA_USERNAME 
+read -sp 'NASA Earthdata Password: ' NASA_PASSWORD
+
+for PAGE in 1 2 3 4 5 6
+do
+  INDEXURL="https://e4ftl01.cr.usgs.gov/MEASURES/SRTMGL3.003/2000.02.11/SRTMGL3_page_$PAGE.html"
+  INDEXFILE=`mktemp`
+
+  echo "getting index.."
+  wget -q -O - $INDEXURL | \
+    sed -r -e '/hgt.zip\"/!d; s/.* ([NSWE0-9]+\.?hgt\.zip).*$/\1/; s/<td><a href="//; s/">.*//'  \
+    > $INDEXFILE
+  echo $INDEXFILE
+  mkdir -p $HGTFILEDIR
+  mkdir -p $TOPOFILEDIR
+
+  echo "retrieving files.."
+  cd $HGTFILEDIR
+  wget --http-user=$NASA_USERNAME --http-password=$NASA_PASSWORD -nv -N -B $INDEXURL -i $INDEXFILE
+  cd -
+
+  rm $INDEXFILE
+done
+
+# to minimize disk space required, run srtm2sdf on each file as it is unzipped.
+HGTREALPATH=`readlink -f $HGTFILEDIR`
+TOPOREALPATH=`readlink -f $TOPOFILEDIR`
+PWD=`pwd`
+
+echo "unpacking hgt files.."
+cd $HGTFILEDIR
+for e in *.zip ; do 
+	echo $e
+	nice unzip -o $e
+	HGTFILE=`echo $e | sed -r -e 's/\.?.SRTMGL3.hgt.zip/.hgt/'`
+	if [ -r $HGTFILE ]; then
+		cd $TOPOREALPATH
+		nice srtm2sdf -d /dev/null $HGTREALPATH/$HGTFILE
+		echo "compressing.."
+		nice bzip2 -f -- *.sdf
+		echo "deleting hgt file.."
+		cd $HGTREALPATH
+		rm $HGTFILE
+	fi
+done
+
+cd $PWD
+
+echo "Complete.  The files in $HGTFILEDIR may be removed."
 
 
diff --git a/get-datafiles.sh b/get-datafiles.sh
deleted file mode 100755
index 45062f6..0000000
--- a/get-datafiles.sh
+++ /dev/null
@@ -1,104 +0,0 @@
-#!/bin/sh
-
-# get the SRTM data files and convert them for splat use
-
-# License: Public domain / CC-0
-
-# Takes one parameter: the continent to retrieve.  Valid values:
-#
-# Africa
-# Australia
-# Eurasia
-# Islands
-# North_America
-# South_America
-
-# path to topgraphy datafiles
-TOPOFILEDIR=splat-datafiles/sdf/
-# local hgt file archive
-HGTFILEDIR=splat-datafiles/hgtzip/
-
-CONTINENT=$1
-case $CONTINENT in
-	North_America|South_America|Africa|Eurasia|Australia|Islands)
-		echo $CONTINENT
-		;;
-	*)
-		echo "Invalid continent: $CONTINENT"
-		exit 1
-		;;
-esac
-
-
-INDEXURL="http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/${CONTINENT}/"
-
-INDEXFILE=`mktemp`
-
-if [ ! -x `which srtm2sdf` ]; then
-	echo "error: not found in path: srtm2sdf splat conversion utility"
-	exit 1
-fi
-
-if [ ! -x `which readlink` ]; then
-	echo "error: not found in path: readlink"
-	exit 1
-fi
-
-if [ ! -x `which wget` ]; then
-	echo "error: not found in path: wget"
-	exit 1
-fi
-
-if [ ! -x `which unzip` ]; then
-	echo "error: not found in path: unzip"
-	exit 1
-fi
-
-if [ ! -x `which bzip2` ]; then
-	echo "error: not found in path: bzip2"
-	exit 1
-fi
-
-echo "getting index.."
-wget -q -O - $INDEXURL | \
-	sed -r -e '/hgt.zip/!d; s/.* ([NSWE0-9]+\.?hgt\.zip).*$/\1/;' \
-	> $INDEXFILE
-
-mkdir -p $HGTFILEDIR
-mkdir -p $TOPOFILEDIR
-
-echo "retrieving files.."
-cd $HGTFILEDIR
-wget -nv -N -B $INDEXURL -i $INDEXFILE
-cd -
-
-rm $INDEXFILE
-
-# to minimize disk space required, run srtm2sdf on each file as it is unzipped.
-
-HGTREALPATH=`readlink -f $HGTFILEDIR`
-TOPOREALPATH=`readlink -f $TOPOFILEDIR`
-PWD=`pwd`
-
-echo "unpacking hgt files.."
-cd $HGTFILEDIR
-for e in *.zip ; do 
-	echo $e
-	nice unzip -o $e
-	HGTFILE=`echo $e | sed -r -e 's/\.?hgt.zip/.hgt/'`
-	if [ -r $HGTFILE ]; then
-		cd $TOPOREALPATH
-		nice srtm2sdf -d /dev/null $HGTREALPATH/$HGTFILE
-		echo "compressing.."
-		nice bzip2 -f -- *.sdf
-		echo "deleting hgt file.."
-		cd $HGTREALPATH
-		rm $HGTFILE
-	fi
-done
-
-cd $PWD
-
-echo "Complete.  The files in $HGTFILEDIR may be removed."
-
-