Polygon Bathymetry to Contour

Discussion created by ELINDBE on Oct 18, 2011
I have a couple different types of bathymetry data for different timelines.  I'm trying to calculate a couple things.  First doing a subtract differential between rasters to determine depth change.  I'm running into a problem with converting the polygons making up the bathymetry into contours or comparable DEM for comparison?  I can't use topo to raster or polygon to polylines and get the correct attributes assigned to new polylines?  What can I use to convert the polygons?