diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..84ab9cc
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+
+if [ "$#" -ne 3 ]; then
+    echo "Usage: $0 <region_root> <region> <memory>"
+    exit 1
+fi
+
+REGION_ROOT="$1"
+REGION="$2"
+MEMORY="$3"
+
+if [ ! -f ./bin/planetiler.jar ]; then
+    mkdir -p ./bin
+    wget -O ./bin/planetiler.jar https://github.com/onthegomap/planetiler/releases/latest/download/planetiler.jar
+fi
+
+VENV_DIR="./venv"
+if [ ! -d "$VENV_DIR" ]; then
+    python3 -m venv "$VENV_DIR"
+    . "$VENV_DIR/bin/activate"
+    pip install --upgrade pip
+    pip install pyhgtmap
+else
+    source "$VENV_DIR/bin/activate"
+fi
+
+POLY_FILE="${REGION}.poly"
+mkdir -p work
+wget -O "work/$POLY_FILE" "https://download.geofabrik.de/${REGION_ROOT}${REGION}.poly"
+
+rm -f data/contours.osm
+pyhgtmap --polygon="work/$POLY_FILE" --step=10 --hgtdir=work/hgt --sources=view1,view3 --simplifyContoursEpsilon=0.00001 -j16 --max-nodes-per-tile=0 --output-prefix data/contours
+
+osmium export data/contours.osm -o data/contours.geojson --overwrite
+rm -f data/contours.osm
+
+mkdir -p ./out
+java -Xmx"$MEMORY" -jar ./bin/planetiler.jar schema.yml \
+    --download \
+    --area=${REGION} \
+    --output="./out/${REGION}.mbtiles" \
+    --no-simplify \
+    --simplify-tolerance-at-max-zoom=0 \
+    --no-feature-merge \
+    --simplify-tolerance=0