..
There are definitely some behaviour I don't quite get in all this...
Thanks,
Guillaume
2013/9/17 :
>
>
>
> -------- Message original ----
> Sujet: Re: [R-sig-Geo] writeRaster to TIF changes raster maximum value
> Date : Tue, 17 Sep 2013 01:25:53 -0400
> De :
Guillaume,
This indeed happens because of NA value handling problems. The native
raster format uses 255 as the NA value for Byte files. That probably
needs to change. You write such a file because you crop a large area
and a temporary file is written. There are work arounds, see below,
but i will
Dear Robert,
Here's a link to 2 images: the original raster (full) and the cropped
one (sub):
https://www.dropbox.com/sh/8zo8fo964kr6ttk/pH1JIpTZ1C
The original raster has Byte values, as you suspected. But I don't know
how to handle that so that it's not used as NA value. From what I read,
NA
I suspect that the original file has Byte values and that 255 is used,
perhaps erroneously, as NA. Can you give me access to the file?
Thanks, Robert
On Mon, Sep 16, 2013 at 8:10 AM, wrote:
> Dear list members,
>
> I need your help trying to figure out why my raster's maximum value gets
> change
Dear list members,
I need your help trying to figure out why my raster's maximum value gets
changed in the resulting TIF file from a call to the writeRaster function.
I read here
(http://r-sig-geo.2731867.n2.nabble.com/writeRaster-to-ascii-file-asc-td7584093.html#none)
that this problem could
