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I have contour lines in a feature class. I covert the closed lines into polygons using the 'Feature to Polygon' tool. With this method I get concentric stripes, but I need the area of each area enclosed by a polygon.

For better understanding see the picture below. So I have the two contours - A and B. If if convert them by using the 'Feature to Polygon' tool on the whole featureclass I get the areas in option one: area enclosed by contour A, and a stripe between A and B. But I need option 2: the area enclosed by A and the area enclosed by B.

enter image description here

To do this I tried to run the 'Feature to Polygon' tool in model builder using on the output of a Feature Selection iterator, but I got an empty feature class.

enter image description here

What am I missing or the iterator tool is a wrong choice?

  • Please update your question to show a screen shot of how you set up the Feature to Polygon tool. – Hornbydd Oct 11 '15 at 19:54
  • Your iterator should do it.. but probably not feature selection. You're wanting overlapping polygons aren't you? The feature to polygon tool will produce planar polygons when a new line is detected a new polygon is created, to create non-planar polygons you will need to polygonize each elevation (or feature, if 100% closed polylines are present) and then append the results to re-stack (or not, depending on what's needed). A bit more information about what you're trying to achieve as an end result would be helpful. – Michael Stimson Oct 11 '15 at 22:30
  • If you are after depth/area curve, your 'concentric' rings is what you need. Sorting them in descending or reverse order and computing accumulated area will produce the curve – FelixIP Oct 12 '15 at 5:31
  • I want to calculate rough volumes of the area covered with the contours. The area of each contour is needed to do the calculation in an other software. I have tried to convert the polylines to 3d ones, but it was no help because making polygons of the 3D polylines resulted stripes just like using the 2D polylines. So I need overlapping polygons, they can be coplanar or parallel, the needed information is the contour (Z) value and the area of each polygon. – fkoppany Oct 12 '15 at 12:07
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The problem with your model is that, each time "Feature To Polygon" is executed, a new polygon feature class replaces the old one. To overcome this situation change the "output feature class" parameter of "Feature To Polygon" to :

Output Feature Class: C:\Users\UserName\Documents\ArcGIS\Default.gdb\LineFC_%Value%

%Value% is the objectid of the line feature which is changing into a polygon. Then do a Merge to merge all feature classes into a single one.

  • 1
    Farid Cher, thank You for your help! The suggested method solved my problem. – fkoppany Oct 14 '15 at 18:34
  • I'm happy to hear that! – Farid Cheraghi Oct 14 '15 at 19:04

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