Hy all.
I was resampling some DEMs with RST and kriging, and the results have
these weird artifacts, take a look:
http://www.igc.usp.br/pessoais/guano/temp/krig_artifact1.ppm
This is the region of the original SRTM
g.region n=7435400 s=7413260 w=284870 e=309890 res=90 save=japi
projection: 1 (UTM)
zone: -23
datum: sam69
ellipsoid: sam69
north: 7435400
south: 7413260
west: 284870
east: 309890
nsres: 90
ewres: 90
rows: 246
cols: 278
and this is the one I am using to resample
g.region res=30 save=japi30
projection: 1 (UTM)
zone: -23
datum: sam69
ellipsoid: sam69
north: 7435400
south: 7413260
west: 284870
east: 309890
nsres: 30
ewres: 30
rows: 738
cols: 834
Any ideas?
thanks
Carlos
--
+-----------------------------------------------------------+
Carlos Henrique Grohmann - Guano
Geologist M.Sc - Doctorate Student at IGc-USP - Brazil
Linux User #89721 - carlos dot grohmann at gmail dot com
+-----------------------------------------------------------+
_________________
"Good morning, doctors. I have taken the liberty of removing Windows
95 from my hard drive."
--The winning entry in a "What were HAL's first words" contest judged
by 2001: A SPACE ODYSSEY creator Arthur C. Clarke
OK, sorry for the large ppms. changed to jpgs.
http://www.igc.usp.br/pessoais/guano/temp/krig_artifact1.jpg
Carlos
On 7/15/06, Hamish <hamish_nospam@yahoo.com> wrote:
> I was resampling some DEMs with RST and kriging, and the results have
> these weird artifacts, take a look:
>
> http://www.igc.usp.br/pessoais/guano/temp/krig_artifact1.ppm
[no idea]
tip:
$ pnmtojpeg krig_artifact1.ppm > krig_artifact1.jpg
$ pnmtopng krig_artifact1.ppm > krig_artifact1.png
ls -s1h krig*
96K krig_artifact1.jpg
304K krig_artifact1.png
1.5M krig_artifact1.ppm
Hamish
--
+-----------------------------------------------------------+
Carlos Henrique Grohmann - Guano
Geologist M.Sc - Doctorate Student at IGc-USP - Brazil
Linux User #89721 - carlos dot grohmann at gmail dot com
+-----------------------------------------------------------+
_________________
"Good morning, doctors. I have taken the liberty of removing Windows
95 from my hard drive."
--The winning entry in a "What were HAL's first words" contest judged
by 2001: A SPACE ODYSSEY creator Arthur C. Clarke
OK fixed. I downloaded the srtm_v2 files again from NASA, and it's all fine now.
Carlos
On 7/15/06, Carlos Guâno Grohmann <carlos.grohmann@gmail.com> wrote:
OK, sorry for the large ppms. changed to jpgs.
http://www.igc.usp.br/pessoais/guano/temp/krig_artifact1.jpg
Carlos
On 7/15/06, Hamish <hamish_nospam@yahoo.com> wrote:
> > I was resampling some DEMs with RST and kriging, and the results have
> > these weird artifacts, take a look:
> >
> > http://www.igc.usp.br/pessoais/guano/temp/krig_artifact1.ppm
>
> [no idea]
>
> tip:
>
> $ pnmtojpeg krig_artifact1.ppm > krig_artifact1.jpg
> $ pnmtopng krig_artifact1.ppm > krig_artifact1.png
>
> ls -s1h krig*
> 96K krig_artifact1.jpg
> 304K krig_artifact1.png
> 1.5M krig_artifact1.ppm
>
> Hamish
>
--
+-----------------------------------------------------------+
Carlos Henrique Grohmann - Guano
Geologist M.Sc - Doctorate Student at IGc-USP - Brazil
Linux User #89721 - carlos dot grohmann at gmail dot com
+-----------------------------------------------------------+
_________________
"Good morning, doctors. I have taken the liberty of removing Windows
95 from my hard drive."
--The winning entry in a "What were HAL's first words" contest judged
by 2001: A SPACE ODYSSEY creator Arthur C. Clarke
--
+-----------------------------------------------------------+
Carlos Henrique Grohmann - Guano
Geologist M.Sc - Doctorate Student at IGc-USP - Brazil
Linux User #89721 - carlos dot grohmann at gmail dot com
+-----------------------------------------------------------+
_________________
"Good morning, doctors. I have taken the liberty of removing Windows
95 from my hard drive."
--The winning entry in a "What were HAL's first words" contest judged
by 2001: A SPACE ODYSSEY creator Arthur C. Clarke
