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<p class=MsoNormal><span lang=EN-US>Hi R- Reserchers<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>To improve my analysis i need a raster with
0.5 x 0.5 of resolution.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I use this code but I tried several
solution to find the right command to obtain 0.5x0.5 resolution<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Thanks <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Ale <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>> dem.area <-
(ground@bbox[1,2]-ground@bbox[1,1])*(ground@bbox[2,2]-ground@bbox[2,1]) #A#
makes the dem area<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>> dem.pixelsize <-
round(sqrt(dem.area/length(ground$Z)),0) #A# makes the cell size<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>> dem.pixelsize<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>[1] 1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>> dem.grid <-
GridTopology(cellcentre.offset=c(ground@bbox[1,1],ground@bbox[2,1]),
cellsize=c(dem.pixelsize,dem.pixelsize),
cells.dim=c(round((ground@bbox[1,2]-ground@bbox[1,1])/dem.pixelsize,0),round((ground@bbox[2,2]-ground@bbox[2,1])/dem.pixelsize,0)))<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>> dem.grid<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> X1 X2<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>cellcentre.offset 267586.6 4147061<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>cellsize 1.0 1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>cells.dim 1405.0 829<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>> dem <- as(SpatialGrid(dem.grid,
proj4string = CRS(as.character(NA))), "SpatialGridDataFrame")<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>> ID <-
as.factor(1:(dem.grid@cells.dim[1]*dem.grid@cells.dim[2]))<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>> dem@data <- as.data.frame(ID)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>> proj4string(dem) <-
CRS("+init=epsg:26911")<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>> str(dem["ID"])<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Formal class 'SpatialGridDataFrame'
[package "sp"] with 6 slots<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> ..@ data :'data.frame': 1164745
obs. of 1 variable:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> .. ..$ ID: Factor w/ 1164745 levels
"1","2","3","4",..: 1 2 3 4 5 6 7 8 9
10 ...<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> ..@ grid :Formal class
'GridTopology' [package "sp"] with 3 slots<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> .. .. ..@ cellcentre.offset: num [1:2]
267587 4147061<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> .. .. ..@ cellsize : num [1:2] 1
1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> .. .. ..@ cells.dim : int [1:2]
1405 829<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> ..@ grid.index : int(0) <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> ..@ coords : num [1:2, 1:2] 267587
268991 4147061 4147889<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> .. ..- attr(*, "dimnames")=List
of 2<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> .. .. ..$ : NULL<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> .. .. ..$ : chr [1:2]
"coords.x1" "coords.x2"<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> ..@ bbox : num [1:2, 1:2] 267586
4147060 268991 4147889<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> .. ..- attr(*, "dimnames")=List
of 2<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> .. .. ..$ : chr [1:2]
"coords.x1" "coords.x2"<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> .. .. ..$ : chr [1:2] "min"
"max"<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> ..@ proj4string:Formal class 'CRS' [package
"sp"] with 1 slots<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> .. .. ..@ projargs: chr "
+init=epsg:26911 +proj=utm +zone=11 +ellps=GRS80 +datum=NAD83 +units=m +no_defs
+towgs84=0,0,0"<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>> <o:p></o:p></span></p>
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