diff --git a/campus/geojson.go b/campus/geojson.go
new file mode 100644
index 0000000..cab54ac
--- /dev/null
+++ b/campus/geojson.go
@@ -0,0 +1,94 @@
+package campus
+
+import (
+	"context"
+
+	"github.com/whosonfirst/go-reader"
+)
+
+func ToGeoJSON(ctx context.Context, c *Complex, r reader.Reader) error {
+
+	terminal_ids := make([]int64, 0)
+	boardingarea_ids := make([]int64, 0)
+	commonarea_ids := make([]int64, 0)
+	observationdeck_ids := make([]int64, 0)
+	gallery_ids := make([]int64, 0)
+	checkpoint_ids := make([]int64, 0)
+	gate_ids := make([]int64, 0)
+	publicart_ids := make([]int64, 0)
+
+	for _, t := range c.Terminals {
+
+		terminal_ids = append(terminal_ids, t.WhosOnFirstId)
+
+		for _, b := range t.BoardingAreas {
+			boardingarea_ids = append(boardingarea_ids, b.WhosOnFirstId)
+
+			for _, g := range b.Gates {
+				gate_ids = append(gate_ids, g.WhosOnFirstId)
+			}
+
+			for _, c := range b.Checkpoints {
+				checkpoint_ids = append(checkpoint_ids, c.WhosOnFirstId)
+			}
+
+			for _, g := range b.Galleries {
+				gallery_ids = append(gallery_ids, g.WhosOnFirstId)
+			}
+
+			for _, p := range b.PublicArt {
+				publicart_ids = append(publicart_ids, p.WhosOnFirstId)
+			}
+
+			for _, o := range b.ObservationDecks {
+
+				observationdeck_ids = append(observationdeck_ids, o.WhosOnFirstId)
+
+				for _, g := range o.Galleries {
+					gallery_ids = append(gallery_ids, g.WhosOnFirstId)
+				}
+
+				for _, p := range o.PublicArt {
+					publicart_ids = append(publicart_ids, p.WhosOnFirstId)
+				}
+
+			}
+		}
+
+		for _, c := range t.CommonAreas {
+
+			commonarea_ids = append(commonarea_ids, c.WhosOnFirstId)
+
+			for _, g := range c.Gates {
+				gate_ids = append(gate_ids, g.WhosOnFirstId)
+			}
+
+			for _, c := range c.Checkpoints {
+				checkpoint_ids = append(checkpoint_ids, c.WhosOnFirstId)
+			}
+
+			for _, g := range c.Galleries {
+				gallery_ids = append(gallery_ids, g.WhosOnFirstId)
+			}
+
+			for _, p := range c.PublicArt {
+				publicart_ids = append(publicart_ids, p.WhosOnFirstId)
+			}
+
+			for _, o := range c.ObservationDecks {
+
+				observationdeck_ids = append(observationdeck_ids, o.WhosOnFirstId)
+
+				for _, g := range o.Galleries {
+					gallery_ids = append(gallery_ids, g.WhosOnFirstId)
+				}
+
+				for _, p := range o.PublicArt {
+					publicart_ids = append(publicart_ids, p.WhosOnFirstId)
+				}
+			}
+		}
+	}
+
+	return nil
+}