I have a list of coordinates that each corresponds to the center of polygon.
My purpose is to create the polygons using lapply() and plot them on the
same device.
And actually I have 2 questions :
- How can I create some polygons using lapply() with a
SpatialPointsDataFrame ?
- How can I
Hi,
I am facing a recurrent problem associated with spTransform() function from
rgdal package.
While I try to change the CRS of a SpatialGrid, I get the following error :
Error in spTransform(grd, CRS(+init=epsg:3857)) :
load package rgdal for spTransform methods
Does anybody know how to
Alright !
You pointed out my goal indeed... but 100meters by 100meters is still a bit
too high for a map over Europe.
So, this is what I have done :
### create a grid raster
ll = CRS(+init=epsg:4326)
origin = SpatialPoints(cbind(7,40),ll)
grid = raster()
## make resolution ie 0.008 min par
Thanks a lot Barry. Your post perfectly matches what I was looking for.
Well now if I want to do a coarser grid covering Europe, what I should do is
doing more or less the same thing, just to change the resolution, right?
res(r)=c(100,100) # an approximate 100meters squared cells
Then I got
You're right, such a high resolution for all over Europe is unrealistic.
I should rather build a smaller grid for the 20m*20m cells and make an other
coarser grid for the whole Europe.
But, anyway, how can I create a spatial grid from scratch, by defining CRS,
resolution and extent of my grid ?
Well, thanks for this advice, but actually I already read this page.
What I was looking for is close to the issue proposed in this post by Lionel
:
http://r-sig-geo.2731867.n2.nabble.com/Turning-SpatialPointsDataFrame-to-Raster-using-rasterize-td7582452.html
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Hi,
I have downloaded some climatic data provided by the Climatic Research Unit
(ref: Mitchell et al. (2003) ; CRU TS 1.2 ; 10' resolution for Europe)
from there :
http://www.cru.uea.ac.uk/cru/data/hrg/timm/grid/CRU_TS_1_2.html
http://www.cru.uea.ac.uk/cru/data/hrg/timm/grid/CRU_TS_1_2.html
I
