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I'm digitizing a historic coastline and would like to add a single depth figure to it in order to merge it with a current contour model. Is there and easy to add depth to the polyline shapefile I am creating?

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Do you have height/depth data for shape file with you ??Few useful link for you dmg.caup.washington.edu/Reports/GIS-to-3DS/index.html ,forums.arcgis.com/threads/… –  Sunil Feb 1 '13 at 11:15
    
I don't have the data immediately to hand, but the map is from the late 19th century so the low water mark should be easy to extrapolate. I live in the area that I am mapping so tide data is easy to come by. –  Stew Feb 4 '13 at 9:41

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