Monica Pisica pisicandru at hotmail.com writes:
Hi,
I have a matrix of data which i can vizualize as an image - for example.
I would like to save this image as a
geotiff file or at a tiff file with a world file which holds the projection
of my data (ultimately the data
represent a map of some sort). I know i can save the data as an ESRI
grid, but i am not interested in that.
I wonder if anybody knows about any code which will help me do that.
See the writeGDAL() function in the rgdal package, and hints on how to
turn your matrix into a SpatialGridDataFrame object in the sp package.
For example:
data(volcano)
str(volcano)
image(volcano)
grd - GridTopology(c(0.5, 0.5), c(1, 1), c(87, 61))
SGDF - SpatialGridDataFrame(grd, data=data.frame(volcano=c(volcano)))
image(SGDF, volcano)
See the proj4string= argument to insert the projection in valid PROJ.4
format. Then:
writeGDAL(SGDF, volcano.tif, drivername = GTiff, ...)
using the options= id needed, to pass through create options as on:
http://www.gdal.org/frmt_gtiff.html
For follow-ups, please consider the R-sig-geo list.
Roger
Thanks in advance,
Monica
_
s. It's easy!
aspxmkt=en-us
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