--- a/pkg/imports/wkb.go	Wed Mar 11 14:23:52 2020 +0100
+++ b/pkg/imports/wkb.go	Wed Mar 11 15:54:37 2020 +0100
@@ -25,21 +25,17 @@
 )
 
 type (
-	pointSlice   []float64
-	lineSlice    [][]float64
-	polygonSlice [][][]float64
+	pointSlice     []float64
+	lineSlice      [][]float64
+	multiLineSlice []lineSlice
+	polygonSlice   [][][]float64
 )
 
 func newPointFeature(newProperties func() interface{}) func() (string, interface{}) {
 	return func() (string, interface{}) { return "Point", newProperties() }
 }
 
-func (ls lineSlice) asWKB() []byte {
-
-	size := 1 + 4 + 4 + len(ls)*(2*8)
-
-	buf := bytes.NewBuffer(make([]byte, 0, size))
-
+func (ls lineSlice) toWKB(buf *bytes.Buffer) {
 	binary.Write(buf, binary.LittleEndian, wkb.NDR)
 	binary.Write(buf, binary.LittleEndian, wkb.LineString)
 	binary.Write(buf, binary.LittleEndian, uint32(len(ls)))
@@ -55,6 +51,14 @@
 		binary.Write(buf, binary.LittleEndian, math.Float64bits(lat))
 		binary.Write(buf, binary.LittleEndian, math.Float64bits(lon))
 	}
+}
+
+func (ls lineSlice) asWKB() []byte {
+
+	size := 1 + 4 + 4 + len(ls)*(2*8)
+
+	buf := bytes.NewBuffer(make([]byte, 0, size))
+	ls.toWKB(buf)
 
 	return buf.Bytes()
 }
@@ -68,6 +72,27 @@
 	return lr
 }
 
+func (mls multiLineSlice) asWKB() []byte {
+
+	size := 1 + 4 + 4
+
+	for _, ls := range mls {
+		size += 1 + 4 + 4 + len(ls)*(2*8)
+	}
+
+	buf := bytes.NewBuffer(make([]byte, 0, size))
+
+	binary.Write(buf, binary.LittleEndian, wkb.NDR)
+	binary.Write(buf, binary.LittleEndian, wkb.MultiLineString)
+	binary.Write(buf, binary.LittleEndian, uint32(len(mls)))
+
+	for _, ls := range mls {
+		ls.toWKB(buf)
+	}
+
+	return buf.Bytes()
+}
+
 func (p pointSlice) asWKB() []byte {
 
 	size := 1 + 4 + 2*8