diff --git a/src/generate_map_key.py b/src/generate_map_key.py
new file mode 100644
index 0000000..f88e06c
--- /dev/null
+++ b/src/generate_map_key.py
@@ -0,0 +1,95 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+from mapcss import MapCSS
+import mapcss.webcolors
+whatever_to_hex = mapcss.webcolors.webcolors.whatever_to_hex
+
+import json
+
+import cairo
+
+import sys
+
+reload(sys)
+sys.setdefaultencoding("utf-8")
+
+minzoom = 0
+maxzoom = 18
+
+sample_width = 80
+
+style = MapCSS(minzoom, maxzoom)
+style.parse(open(sys.argv[1],"r").read(), clamp=False)
+
+
+tags = [json.loads(x) for x in open("data/tags.list", "r")]
+print len(tags)
+#a = cairo.PDFSurface("legend.pdf",100,100*len(tags))
+
+maxzoom += 1
+
+a = cairo.ImageSurface (cairo.FORMAT_ARGB32, maxzoom*sample_width, 50*len(tags))
+cr = cairo.Context(a)
+cr.translate(0,0.5)
+
+
+i = 0
+for tag in tags:
+  had_lines = False
+  for zoom in range (minzoom, maxzoom):
+    styles = style.get_style_dict("area", tag, zoom, olddict = {})
+    styles = style.get_style_dict("line", tag, zoom, olddict = styles.copy())
+    
+    styles = styles.values()
+    styles.sort(key=lambda x: x.get('z-index',0))
+    if len(styles) > 0:
+      for st in styles:
+        if "fill-color" in st and st.get("fill-opacity", 1) > 0:
+            color = st.get('fill-color', (0.,0.,0.))
+            cr.set_source_rgba(color[0], color[1], color[2], st.get("fill-opacity", 1))
+            cr.move_to(0+sample_width*zoom, 20+50*i)
+            cr.line_to(sample_width+sample_width*zoom, 20+50*i)
+            cr.line_to(sample_width+sample_width*zoom, 55+50*i)
+            cr.line_to(0+sample_width*zoom, 20+50*i)
+            had_lines = True
+            cr.fill()
+      for st in styles:
+        if "casing-width" in st and st.get("casing-opacity", 1) > 0:
+            color = st.get('casing-color', (0.,0.,0.))
+            cr.set_source_rgba(color[0], color[1], color[2], st.get("casing-opacity", 1))
+            cr.set_line_width (st.get("width",0)+2*st.get("casing-width", 0))
+            cr.set_dash(st.get('casing-dashes', st.get('dashes', []) ))
+            cr.move_to(0+sample_width*zoom, 50+50*i)
+            cr.line_to(sample_width+sample_width*zoom, 50+50*i)
+            had_lines = True
+            cr.stroke()
+      for st in styles:
+        if "width" in st and st.get("opacity", 1) > 0:
+            color = st.get('color', (0.,0.,0.))
+            cr.set_source_rgba(color[0], color[1], color[2], st.get("opacity", 1))
+            cr.set_line_width (st.get("width",0))
+            cr.set_dash(st.get('dashes', []))
+            cr.move_to(0+sample_width*zoom, 50+50*i)
+            cr.line_to(sample_width+sample_width*zoom, 50+50*i)
+            had_lines = True
+            cr.stroke()
+
+      if had_lines:
+            cr.move_to(0+sample_width*zoom, 25+50*i)
+            cr.set_source_rgb(0, 0, 0)
+            cr.show_text('z'+str(zoom))
+
+  if had_lines:
+        text = '[' + ']['.join([ k+"="+v for k,v in tag.iteritems()])+']'
+        cr.move_to(10, 20+50*i)
+        cr.set_source_rgb(0, 0, 0)
+        cr.show_text(text)
+        cr.set_line_width (1)
+        cr.set_dash([])
+        cr.move_to(0, 60+50*i)
+        cr.line_to(maxzoom*sample_width, 60+50*i)
+        
+        cr.stroke()
+        i += 1
+#a.finish()
+a.write_to_png ("legend.png") 
\ No newline at end of file