[R-sig-Geo] Change z coordinates of SpatialGridDataFrame

[Edzer Pebesma]

Is ground level varying, over your domain? If yes, the new set of voxels 
may no longer be a regular grid in the new CRS; you could represent them 
as a SpatialPointsDataFrame. If no, you could simply modify 
obj at grid@cellcentre.offset[3]

On 02/13/2013 10:05 PM, Nathalie Morin wrote:
> Hello,
>
>
>
> I would like to change or assign a new value of the z coordinates
> intrinsically in a 3 dimensional SpatialGridDataFrame from absolute height
> in UTM to relative height above the ground, in order to remove slope. So
> basically, I would like to move the current position of the voxels according
> to a new vector of coordinates, but by keeping the same data attribute
> contained in each of the original voxels.
>
>
>
> I tried creating a new SpatialGridDataFrame from (i) a new GridTopology with
> z coordinates in relative height and from (ii) the same vector of attribute,
> but of course this does not actually move the cubes accordingly in the 3
> dimensional space. It just changes the z value of the voxel from UTM to
> relative height above the ground. Same thing when I try doing this with a
> regular 3D Array.
>
>
>
> Does anybody have any hints in how to achieve this with (or without) sp ?
>
> Cheers,
>
> Nathalie
>
>
>
> --
>
> Nathalie MORIN
>
> Doctorante en télédétection forestière (Ph.D. student in remote sensing
> applied to forestry)
>
> Centre d’application et de recherches en télédétection (CARTEL)
>
> Département de géomatique appliquée
>
> Université de Sherbrooke
>
> Sherbrooke (QC) Canada J1K 2R1
>
> Tel. : + 1 (819)  821-8000 #62962
>
> e-mail :  <mailto:Nathalie.M.Morin at Usherbrooke.ca>
> Nathalie.M.Morin at Usherbrooke.ca
>
> Page Web :  <http://pages.usherbrooke.ca/cartel/morin_nathalie.php>
> http://pages.usherbrooke.ca/cartel/morin_nathalie.php
>
>
>
>
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>
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-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de