converting vectors to raster (burning streams)

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I converted my stream vector to a raster file (using polyline to raster conversion tool). I anticipated that I would get a No Data row in the raster file attribute table, so that I could use a conditional statement to burn the streams into the DEM:

con(stream_raster>0, (focalmin_dem - 2), original_dem)

However, since I did not get a No Data row, all this gives me is a a DEM img directly beneath the streams (not the remaining extent of the image).

What am I missing?



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