I have some contour data and I would like to create polygon features which represents everywhere above or below a certain height.
So I want to feed in 5m contours and get polygons showing everywhere that is 6.2m or below.
cheers
IanM
Userlevel 4
- 8167 replies
-
1 September 2014
Hi,
try using a LineJoiner with a Group By on the altitude attribute. If the contours don't line up perfectly, consider using a Snapper with a suitable tolerance first.
You can then use a GeometryCoercer with type fme_polygon to convert the line sections into polygons. You will probably want to pass it through a GeometryValidator next to detect any faulty polygons.
Finally you can use a Tester on the polygon's altitude attribute to filter out the ones you want to keep.
David
many thanks
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