--- a/python/metadata.py	Tue May 31 17:07:23 2016 -0400
+++ b/python/metadata.py	Thu Jun 09 15:36:21 2016 -0400
@@ -18,12 +18,16 @@
     description = Column(String) # longer names, eg intersection of road1 and road2
     xcoordinate = Column(Float)  # ideally moving.Point, but needs to be 
     ycoordinate = Column(Float)
+    mapImageFilename = Column(String) # path to filename, relative to site name, ie sitename/mapImageFilename
+    nUnitsPerPixel = Column(Float) # number of units of distance per pixel in map image
     
-    def __init__(self, name, description = "", xcoordinate = None, ycoordinate = None):
+    def __init__(self, name, description = "", xcoordinate = None, ycoordinate = None, mapImageFilename = None, nUnitsPerPixel = 1.):
         self.name = name
         self.description = description
         self.xcoordinate = xcoordinate
         self.ycoordinate = ycoordinate
+        self.mapImageFilename = mapImageFilename
+        self.nUnitsPerPixel = nUnitsPerPixel
 
     def getFilename(self):
         return self.name