On Mon, Dec 10, 2012 at 1:17 PM, Glynn Clements gl...@gclements.plus.com
There isn't currently an efficient way to join slices either using
commands or the public C API.
I wonder if the segment lib could be (ab)used for this?
Markus
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grass-user
On Wed, Dec 12, 2012 at 7:37 PM, Markus Neteler nete...@osgeo.org wrote:
On Mon, Dec 10, 2012 at 1:17 PM, Glynn Clements gl...@gclements.plus.com
There isn't currently an efficient way to join slices either using
commands or the public C API.
I wonder if the segment lib could be (ab)used for
Ok, thank you.
I will try it and inform about results here.
On Mon, Dec 10, 2012 at 4:17 PM, Glynn Clements gl...@gclements.plus.comwrote:
Andranik Hayrapetyan wrote:
r.mapcalc?
I don't know how to overlay rasters with r.mapcalc. can you, please be a
bit detailed?
So, here are two versions of script, of parallel GRASS jobs with *split
map into spatial chunks (possibly with overlap to gain smooth results)*
approach.
First script ( script1.bash ) is splitting the region in specified number
of smaller regions, do the calculation ( calculating NDVI for example
Andranik Hayrapetyan wrote:
r.mapcalc?
I don't know how to overlay rasters with r.mapcalc. can you, please be a
bit detailed?
r.mapcalc 'outmap = if(isnull(map1),map2,map1)'
But this is just as inefficient as r.patch.
There isn't currently an efficient way to join slices
r.mapcalc?
I don't know how to overlay rasters with r.mapcalc. can you, please be a
bit detailed?
On Thu, Dec 6, 2012 at 4:53 PM, Helmut Kudrnovsky hel...@web.de wrote:
So as I understand the only way to concatenate chunks of compressed image
is r.patch
r.mapcalc?
Thank you for your response,
I found an alternative way to avoid r.patch. But it is only for special
cases when you need to output image after calculation at once.
I put all chunks into a group with i.group and after it export the group
with r.out.gdal . It is much more faster then when I
Hi again,
In order not to confuse you, I'd like to inform that my last post was
wrong, I have some mistakes in my script and came across wrong results.
Actually making group of chunks and exporting it making multiband image.
It is working slow, as it is filling nodata of each chunk with 0, and
So as I understand the only way to concatenate chunks of compressed image
is r.patch
r.mapcalc?
http://grass.osgeo.org/grass64/manuals/r.mapcalc.html
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best regards
Helmut
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View this message in context:
Hi all,
I am trying to make a script which will split a raster map into chunks, do
the calculation on every chunk separately ( in parallel way ), and gather
together all the peaces.
So I am cutting the region into peaces, doing the calculation, restoring
region to default region and finally get
Andranik Hayrapetyan wrote:
I am trying to make a script which will split a raster map into chunks, do
the calculation on every chunk separately ( in parallel way ), and gather
together all the peaces.
So I am cutting the region into peaces, doing the calculation, restoring
region to
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