Appropriate selection of the TIN interpolation's search radius using weedtolerance, to eliminate points along each contour at a specified interval, and proximal tolerance to either eliminate or include points between contours at a specified radius from each candidate point not eliminated by the weedtolerance is important for ensuring that the TIN uses as few redundant points as possible while still retaining the maximum amount of variation in the relief captured by the contours.  In a sense using these parameters resamples a TIN into a finer set of integrated triangles if low values are applied, and if higher values are used the resulted set of triangles are larger and more general.  By varying these values between 1 and 50 and iteratively creating TINs and summing the total number of flat triangles and nearly vertical sliver triangles in each of the TINs produced by the different combinations of weedtolerance and proximal tolerance it was possible to visually judge which value range produced the best results.
 

100 foot weedtolerance and a 50 foot proximal tolerance


 

25 foot weedtolerance and a 10 foot proximal tolerance

10 foot weedtolerance and a 5 foot proximal tolerance

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created by jeff 9/1/00