creating a pixel image

Hi,
Someone could help me in create a pixel image using  the SPATSTAT Package?
Attached there is a sample from my data. The column names are (x and y
coordinates, and elevation (alt_m).
Thanks
K?tia Em?dio da Silva DSc
Eng. Florestal
Pesquisador
Embrapa Amaz?nia Ocidental
Fone: +550319233037916

Forestry Engineer
Researcher at Brazilian Agricultural Research Corporation
 Embrapa western Amazon
Manaus/AM-Brazil
-------------- next part --------------
X	Y	alt_m
499568.12	9719540.83	133.53
499569.27	9719541.06	133.63
499570.41	9719541.28	133.74
499571.56	9719541.51	133.85
499572.71	9719541.74	133.96
499573.86	9719541.97	134.11
499575.01	9719542.19	134.20
499576.16	9719542.42	134.26
499577.31	9719542.65	134.26
499578.46	9719542.88	134.18
499579.61	9719543.10	133.99
499580.76	9719543.33	133.69
499581.91	9719543.56	133.22
499583.06	9719543.79	132.60
499584.21	9719544.01	131.91
499585.36	9719544.24	131.19
499586.51	9719544.47	130.48
499587.66	9719544.69	129.83
499588.81	9719544.92	129.40
499589.96	9719545.15	129.00
499591.11	9719545.38	128.74
499592.26	9719545.60	128.48
499593.41	9719545.83	128.18
499594.56	9719546.06	127.85
499595.71	9719546.29	127.41
499596.86	9719546.51	127.09
499598.01	9719546.74	126.96
499599.16	9719546.97	126.78
499600.31	9719547.20	126.64
499601.46	9719547.42	126.52
499602.61	9719547.65	126.38
499603.76	9719547.88	126.20
499604.90	9719548.11	126.15
499606.05	9719548.33	126.22
499607.20	9719548.56	126.38
499608.35	9719548.79	126.66
499609.50	9719549.01	126.92
Hi,

I'm not quite clear on what you want; see below.
Hi,
Someone could help me in create a pixel image using  the SPATSTAT Package?
spatstat doesn't deal with pixel images (raster?) but instead with
point pattern objects. If that's what you want, ?ppp will get you
started.
Attached there is a sample from my data. The column names are (x and y
coordinates, and elevation (alt_m).
Thanks
You don't provide either enough data or enough information for me to
be able to know whether your data are gridded or not. If so, this will
work for creating a SpatialGridDataFrame:

library(sp)
coordinates(mydata) <- ~X+Y

But I'm not sure if that's what you want: what are you trying to do,
and what do your data represent?

Sarah
Sarah Goslee
http://www.functionaldiversity.org
Is it for using it as a covariate in ppm? You have function:

 im(mat, xcol=seq_len(ncol(mat)), yrow=seq_len(nrow(mat)),
   xrange=NULL, yrange=NULL,
   unitname=NULL)

Which will create it. I have used it at some point, trying to import raster objects a bit brute force, and I had to play around with transposing and reordering of rows and/or columns. Your data is not a matrix, so you will need to create a matrix containing your data in an appropriate way. However, your data seem to be a transect (line) so not really fitting to create an image...

---------------------------------------
Jos? M. Blanco-Moreno
Dept. de Biologia Vegetal (Bot?nica)
Facultat de Biologia
Universitat de Barcelona
Av. Diagonal 643
08028 Barcelona
SPAIN
---------------------------------------
phone: (+34) 934 039 863
fax: (+34) 934 112 842
---------------------------------------
Enviat el: dilluns, 9 / juliol / 2012 16:11
Per a: K?tia Emidio
Cc: r-sig-ecology at r-project.org"
Tema: Re: [R-sig-eco] creating a pixel image

Hi,

I'm not quite clear on what you want; see below.

On Sun, Jul 8, 2012 at 6:37 PM, K?tia Emidio <kat.emidio at gmail.com> wrote:
> Hi,
> Someone could help me in create a pixel image using  the SPATSTAT Package?

spatstat doesn't deal with pixel images (raster?) but instead with
point pattern objects. If that's what you want, ?ppp will get you
started.

> Attached there is a sample from my data. The column names are (x and y
> coordinates, and elevation (alt_m).
> Thanks

You don't provide either enough data or enough information for me to
be able to know whether your data are gridded or not. If so, this will
work for creating a SpatialGridDataFrame:

library(sp)
coordinates(mydata) <- ~X+Y

But I'm not sure if that's what you want: what are you trying to do,
and what do your data represent?

Sarah

--
Sarah Goslee
http://www.functionaldiversity.org

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