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| Why are the contours in the Grid Node Editor different from the contours in a contour map for the same grid file? |
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The contour map uses a different contouring algorithm than the Grid Node Editor to allow for filled contours and inline contour labels.
The different algorithms can handle saddle conditions differently, which can result in a minor difference (both are correct though). For example, the Grid Node Editor connects the lows and the contour map does not. Conversely, you may see that the highs are broken apart in the Grid Node Editor and are connected in the contour map. Both ways are mathematically correct, although you might prefer to connect the lows in a contour map when they represent a drainage.
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