[GRASS-user] integration of sample.c algorithms into r.resample

[Michael Barton]

This sounds OK too.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics and Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton


> From: Paul Kelly <paul-grass at stjohnspoint.co.uk>
> Date: Thu, 17 Aug 2006 17:37:35 +0100 (BST)
> To: Dylan Beaudette <dylan.beaudette at gmail.com>
> Cc: <grassuser at grass.itc.it>, Glynn Clements <glynn at gclements.plus.com>
> Subject: Re: [GRASS-user] integration of sample.c algorithms into r.resample
> 
> On Thu, 17 Aug 2006, Dylan Beaudette wrote:
> 
>> On 8/17/06, Paul Kelly <paul-grass at stjohnspoint.co.uk> wrote:
>>> 
>>> To throw in another suggestion, how about r.resamp.interp? This it would
>>> mean it would be adjacent in the manuals to the other resampling modules
>>> (r.resample and r.resamp.rst) for anyone looking for them, and might also
>>> imply that r.resample (the only one with the full word in its name) was
>>> kind of a default, basic resampler whilst r.resamp.interp and r.resamp.rst
>>> used more advanced and/or interesting resampling methods.
>>> 
>> 
>> That sounds good to me.
> 
> Well I would commit it to CVS if it's OK. I briefly edited the r.bilinear
> man page to create a rough manpage for r.resamp.interp (see below): are
> there any glaring errors?
> 
> Paul
> 
> r.resamp.interp(1)     Grass User's Manual     r.resamp.interp(1)
> 
> NAME
>         r.resamp.interp   -  Resamples  raster  map  layers  using
>         interpolation.
> 
> SYNOPSIS
>         r.resamp.interp
> 
>         r.resamp.interp help
> 
>         r.resamp.interp  input=name  output=name   [method=string]
>         [--overwrite]
> 
>     Flags:
>         --overwrite
> 
>     Parameters:
>         input=name
>             Name of input raster map
> 
>         output=name
>             Name for output raster map
> 
>         method=string
>             Interpolation method Options: nearest,bilinear,bicubic
>             Default: bilinear
> 
> DESCRIPTION
>         r.resamp.interp fills a grid  cell  (raster)  matrix  with
>         interpolated  values  generated  from a set of input layer
>         data points. A choice of three  interpolation  methods  is
>         available;  each  uses  the weighted values of a different
>         number of adjacent cells in the input map to determine the
>         value of each cell in the output map as follows:
> 
>                       nearest neighbour (1 cell)
> 
>                       bilinear (4 cells)
> 
>                       bicubic (12 cells)
> 
>         If there is a current working mask, it applies to the out­
>         put raster file.  Only those cells falling within the mask
>         will  be  assigned interpolated values.  The procedure for
>         selection of input data will consider all input data rele­
>         vant  to  interpolating  values at the cell centers of the
>         current geographic region, ignoring the curent mask.  Note
>         that  for bilinear and bicubic interpolation, cells of the
>         output raster that cannot be bounded  by  the  appropriate
>         number of input cell centers are set to null.
> 
> NOTES
>         For  longitude-latitude databases, the interpolation algo­
>         rithm is based on degree fractions, not  on  the  absolute
>         distances  between cell centers.  Any attempt to implement
>         the latter would violate the integrity of  the  interpola­
>         tion method.
> 
> SEE ALSO
>         g.region, r.resample, r.resamp.rst
> 
> AUTHOR
>         Glynn Clements
> 
>         Last changed: $Date: 2003/04/30 15:17:25 $
> 
>         Full index
> 
> GRASS 6.3.cvs                                  r.resamp.interp(1)