r.resamp.interp(1grass)

1r.resamp.interp(1)            Grass User's Manual           r.resamp.interp(1)
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NAME

6       r.resamp.interp   - Resamples raster map to a finer grid using interpo‐
7       lation.
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KEYWORDS

10       raster, resample, interpolation
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SYNOPSIS

13       r.resamp.interp
14       r.resamp.interp --help
15       r.resamp.interp input=name output=name  [method=string]   [--overwrite]
16       [--help]  [--verbose]  [--quiet]  [--ui]
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18   Flags:
19       --overwrite
20           Allow output files to overwrite existing files
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22       --help
23           Print usage summary
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25       --verbose
26           Verbose module output
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28       --quiet
29           Quiet module output
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31       --ui
32           Force launching GUI dialog
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34   Parameters:
35       input=name [required]
36           Name of input raster map
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38       output=name [required]
39           Name for output raster map
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41       method=string
42           Sampling interpolation method
43           Options: nearest, bilinear, bicubic, lanczos
44           Default: bilinear
45           nearest: Nearest-neighbor interpolation
46           bilinear: Bilinear interpolation
47           bicubic: Bicubic interpolation
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DESCRIPTION

50       r.resamp.interp  resamples an input raster map by interpolating between
51       the neighboring cells via a selectable resampling algorithm. All  cells
52       present  in  the neighborhood of the input raster cell must be non-null
53       to generate a non-null cell in the output raster map. A choice of  four
54       interpolation  methods is available; each uses the weighted values of a
55       different number of adjacent cells in the input map  to  determine  the
56       value of each cell in the output map as follows:
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58           ·   nearest neighbour (1 cell)
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60           ·   bilinear (4 cells)
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62           ·   bicubic (16 cells)
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64           ·   lanczos (25 cells)
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66       This  module  is  intended  for reinterpolation of continuous data to a
67       different resolution rather than for interpolation from scattered  data
68       (use the v.surf.* modules for that purpose).
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NOTES

71       Resampling   modules   (r.resample,   r.resamp.stats,  r.resamp.interp,
72       r.resamp.rst) resample the map to match the current region settings.
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74       Note that for bilinear, bicubic and lanczos interpolation, cells of the
75       output raster that cannot be bounded by the appropriate number of input
76       cell centers are set to NULL (NULL propagation). This could  occur  due
77       to  the  input  cells  being  outside the current region, being NULL or
78       MASKed.
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80       For longitude-latitude locations, the interpolation algorithm is  based
81       on  degree  fractions,  not on the absolute distances between cell cen‐
82       ters.  Any attempt to implement the latter would violate the  integrity
83       of the interpolation method.
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EXAMPLE

86       Resample  elevation  raster  map  to  a higher resolution (from 500m to
87       250m; North Carolina sample dataset):
88       g.region raster=elev_state_500m -p
89       g.region res=250 -ap
90       r.resamp.interp input=elev_state_500m output=elev_state_250m \
91                       method=bilinear
92       Original 500m resolution elevation map
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94       Resampled (bilinear) 250m resolution elevation map
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AUTHOR

102       Glynn Clements
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104       Last changed: $Date: 2016-08-03 13:50:26 +0200 (Wed, 03 Aug 2016) $
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SOURCE CODE

107       Available at: r.resamp.interp source code (history)
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109       Main index | Raster index | Topics index | Keywords index  |  Graphical
110       index | Full index
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112       © 2003-2019 GRASS Development Team, GRASS GIS 7.4.4 Reference Manual
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116GRASS 7.4.4                                                 r.resamp.interp(1)