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SMS 11.0 Raster to Mesh Interpolation


Matt_Bilskie
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Hi Matt,

Currently in SMS the only option for interpolating from a raster to a mesh is direct lookup. The mesh node gets the value of the cell that the node is in. If the mesh node is not within the bounds of any visible rasters or occupies a NULL cell, the node will get the extrapolation value.

If you convert the raster to scatter upon load, you do have the option to use IDW interpolation/extrapolation.

By the way, if we were to add additional interpolation/extrapolation options for interpolating from a raster which would you want the most and why?

Good afternoon! What kind of interpolation is done when computing the raster interpolation in SMS 11.0. I am assuming at this point, if I want to have control over the interpolation method I should first convert the rater to a scatter.

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Hi Matt,

Currently in SMS the only option for interpolating from a raster to a mesh is direct lookup. The mesh node gets the value of the cell that the node is in. If the mesh node is not within the bounds of any visible rasters or occupies a NULL cell, the node will get the extrapolation value.

If you convert the raster to scatter upon load, you do have the option to use IDW interpolation/extrapolation.

By the way, if we were to add additional interpolation/extrapolation options for interpolating from a raster which would you want the most and why?

Hey Rusty! I think direct lookup, linear, IDW, and NN interpolation and IDW extrapolation would be beneficial, for elevation data. My research thus far for my thesis has been on assessing some of the error introduced when interpolating raw LiDAR to a finite element nodes or a DEM to finite element nodes. For LiDAR data, linear, NN and IDW seems to be sufficient due to the high density of the data points.

Having this capability in SMS would be beneficial. From my knowledge there is not a way to interpolate a DEM to a set number of points at set locations either in ArcGIS or Global Mapper. In other words, inputting a DEM raster and points (w/out z-values) and getting the points with z-values interpolated from the DEM. This would eliminate the need for converting DEM centers to points and importing them in a as scatter set.

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