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I am having trouble making smooth contours from a DEM I created by merging two different DEMs of different resolutions (1m and 10m). The DEMs are partially overlapping and the contours I have generated are irregular on the interface between the two original data sets. I have tried using gdalwarp to resample the merged DEM, however this doesn't make enough of a difference.

Is there a better way to tackle this problem?

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