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Automatic geographical projection parameters setting
3 messages · Francesco Carotenuto, Alexandre Villers, Pascal Oettli
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Hello,
Something like that?
> LONG <- 20
> LAT <- 5
> crs.args <- paste("+proj=laea +lat_0=",LAT," +lon_0=",LONG," +x_0=0
+y_0=0 +ellps=WGS84 +units=m +no_defs",sep="")
> CRS("+proj=laea +lat_0=5 +lon_0=20 +x_0=0 +y_0=0 +ellps=WGS84
+units=m +no_defs")
CRS arguments:
+proj=laea +lat_0=5 +lon_0=20 +x_0=0 +y_0=0 +ellps=WGS84 +units=m
+no_defs
> CRS(crs.args)
CRS arguments:
+proj=laea +lat_0=5 +lon_0=20 +x_0=0 +y_0=0 +ellps=WGS84 +units=m
+no_defs
Regards,
Pascal
On 05/29/2013 04:58 PM, Francesco Carotenuto wrote:
Hi
to all,
I
need to automatically set the geographical coordinates of the projection?s
centre to project different polygons in different territories. My problem is the
following.
By
using spTransform(xy, CRS("+proj=laea +lat_0=LAT +lon_0=LONG +x_0=0 +y_0=0
+ellps=WGS84 +units=m +no_defs")), I would like to set +lat_0 and +long_0 as objects (here ?LAT? and
?LONG?) that I automatically generated. Unfortunately, this function doesn?t
read objects (even if ?as.numeric?) but only numerical values set manually. Is
there a way to set these coordinates as objects?
Many
thanks.
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