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@@ -1,9 +1,12 @@
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<h2>DESCRIPTION</h2>
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-<em>r.fillnulls</em> fills NULL pixels (no data areas) in input map and
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-stores filled map to a new output map. The fill data are interpolated
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-from the no data area boundaries buffer using <em>v.surf.rst</em> or
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-<em>v.surf.bspline</em> spline interpolation.
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+<em>r.fillnulls</em> fills NULL pixels (no data areas) in input raster
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+map and stores filled data to a new output raster map. The fill areas
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+are interpolated from the no data area boundaries buffer
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+using <em><a href="v.surf.rst.html">v.surf.rst</a></em> regularized
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+spline interpolation with tension (<b>method=rst</b>) or
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+<em><a href="r.resamp.bspline.html">r.resamp.bspline</a></em> cubic or
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+linear spline interpolation with Tykhonov regularization.
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<h2>NOTES</h2>
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@@ -26,17 +29,18 @@ may pay attention to below notes.
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If interpolation fails, temporary raster and vector maps are left in place to allow
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unfilled map hole (NULL area) identification and manual repair.
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-<h2>NOTES</h2>
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-
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-When using the default RST method, the algorithm is based on <em>v.surf.rst</em>
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-regularized splines with tension interpolation module which interpolates the
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-raster cell values for NULL data areas from the boundary values of the NULL
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-data area. An eventual raster MASK is respected during the NULL data area(s)
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-filling. The interpolated values are patched into the NULL data area(s) of
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-the input map and saved into a new raster map.
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-
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-Otherwise, either the bilinear or bicubic method can be selected (based on
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-<em>v.surf.bspline</em>).
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+<p>
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+When using the default RST method, the algorithm is based
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+on <em><a href="v.surf.rst.html">v.surf.rst</a></em> regularized
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+splines with tension interpolation module which interpolates the
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+raster cell values for NULL data areas from the boundary values of the
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+NULL data area. An eventual raster MASK is respected during the NULL
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+data area(s) filling. The interpolated values are patched into the
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+NULL data area(s) of the input map and saved into a new raster map.
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+
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+Otherwise, either the linear or cubic spline interpolation with
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+Tykhonov regularization can be selected (based on
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+<em><a href="r.resamp.bspline.html">r.resamp.bspline</a></em>).
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<h2>WARNING</h2>
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@@ -44,11 +48,13 @@ Depending on the shape of the NULL data area(s) problems may occur due to an
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insufficient number of input cell values for the interpolation process. Most
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problems will occur if a NULL data area reaches a large amount of the map
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boundary. The user will have to carefully check the result using
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-<em>r.mapcalc</em> (generating a difference map to the
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-input map and applying the "differences" color table with <em>r.colors</em>)
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-and/or <em>d.what.rast</em> to query individual cell values.
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+<em><a href="r.mapcalc.html">r.mapcalc</a></em> (generating a
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+difference map to the input map and applying the
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+"differences" color table
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+with <em><a href="r.colors.html">r.colors</a></em>) and/or to query
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+individual cell values.
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-<h2>WARNING</h2>
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+<p>
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RST method stores temporary maps on hard disk. It will require at least as much
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free space as one extra input raster map takes.
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@@ -72,40 +78,41 @@ d.histogram elev_srtm_30m_complete
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d.rast elev_srtm_30m_complete
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</pre></div>
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-
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-<h2>SEE ALSO</h2>
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-
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-<em>
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-<a href="r.fill.dir.html">r.fill.dir</a>,
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-<a href="r.mapcalc.html">r.mapcalc</a>,
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-<a href="v.surf.bspline.html">v.surf.bspline</a>,
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-<a href="v.surf.rst.html">v.surf.rst</a>
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-</em>
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-
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<h2>REFERENCES</h2>
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-<p> Mitas, L., Mitasova, H., 1999, Spatial Interpolation. In: P.Longley,
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+<ul>
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+<li> Mitas, L., Mitasova, H., 1999, Spatial Interpolation. In: P.Longley,
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M.F. Goodchild, D.J. Maguire, D.W.Rhind (Eds.), Geographical Information
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Systems: Principles, Techniques, Management and Applications, Wiley,
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pp.481-492
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-<p>Mitasova H., Mitas L., Brown W.M., D.P. Gerdes, I.
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+<li>Mitasova H., Mitas L., Brown W.M., D.P. Gerdes, I.
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Kosinovsky, Baker, T.1995, Modeling spatially and temporally distributed
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phenomena: New methods and tools for GRASS GIS. <i>International Journal of
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GIS</i>, 9 (4), special issue on Integrating GIS and Environmental modeling,
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433-446.
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-<p><a href="http://skagit.meas.ncsu.edu/~helena/gmslab/papers/lmg.rev1.ps">Mitasova H.
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+<li><a href="http://skagit.meas.ncsu.edu/~helena/gmslab/papers/lmg.rev1.ps">Mitasova H.
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and Mitas L. 1993</a>: Interpolation by Regularized Spline with Tension: I.
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Theory and Implementation, <i>Mathematical Geology</i> 25, 641-655.
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-<p><a href="http://skagit.meas.ncsu.edu/~helena/gmslab/papers/hmg.rev1.ps">Mitasova H.
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+<li><a href="http://skagit.meas.ncsu.edu/~helena/gmslab/papers/hmg.rev1.ps">Mitasova H.
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and Hofierka L. 1993</a>: Interpolation by Regularized Spline with Tension:
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II. Application to Terrain Modeling and Surface Geometry Analysis,
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<i>Mathematical Geology</i> 25, 657-667.
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+</ul>
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+
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+<h2>SEE ALSO</h2>
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+
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+<em>
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+<a href="r.fill.dir.html">r.fill.dir</a>,
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+<a href="r.mapcalc.html">r.mapcalc</a>,
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+<a href="r.resamp.bspline.html">r.resamp.bspline</a>,
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+<a href="v.surf.rst.html">v.surf.rst</a>
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+</em>
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<h2>AUTHORS</h2>
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-r.fillnulls: Markus Neteler, University of Hannover and Fondazione Edmund Mach
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-<p>and authors of v.surf.rst<br>
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+Markus Neteler, University of Hannover and Fondazione Edmund Mach<br>
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Improvement by Hamish Bowman, NZ
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-<p><i>Last changed: $Date$</i>
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+<p>
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+<i>Last changed: $Date$</i>
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Martin Landa