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Interpreting interpolation: the pattern of interpolation errors in digital surface models derived from laser scanning data

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Figure

Figure 2a: Showing the different surfaces created using the interpolation methods. Surfaces created from  raw first return laser scanner data kindly supplied by the Environment Agency for England and Wales
Figure 2b: Showing the contour maps for the four DSMs. Note the blocky nature of the surface contours created using the nearest neighbour methodology
Figure 3: Point plot showing the spatial variation in error across the surface. Low/no errors are represented in green, positive errors in red, and negative errors in blue
Figure 4: Orthorectified photograph of the corresponding area. Aerial photography reproduced with permission of Ordnance Survey  © Cc Ordnance Survey
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