On Fri, Dec 6, 2013 at 1:59 PM, Nitendra Gautam <nitendra.gautam@my.ndsu.edu
wrote:
Thank You Vaclav Peters for your reply.
Well i am trying to use GRASS GISas a back end server for web processing
service.
I did modified my code according to your suggestions but did some mistake
on the say
i have pasted my code here(http://pastie.org/8533927).
I think i did some mistake on passing the argument in the function .you
can check on link 2 on http://134.129.125.124/.
I am getting the following error message in my error log.
Premature end of script headers: newcode2.py, referer:
http://134.129.125.124/
Any suggestions on where i did wrong?
The error message is from pyWPS not GRASS, so you need to check with them
how to get something which can you tell more about what happened.
However, I think that you are calling GRASS command in the wrong way:
self.cmd(["r.in.gdal -o", "inp...
I'm not sure about the interface there (in pyWPS) but I guess that it
should be:
self.cmd(["r.in.gdal", "-o", "inp...
Each parameter (grass option or flag in this case) should be a separate
item in the list (self.cmd).
Vaclav
Thank You
Nitendra Gautam
------------------------------
*From:* Vaclav Petras <wenzeslaus@gmail.com>
*Sent:* Friday, December 06, 2013 9:15 AM
*To:* Nitendra Gautam
*Cc:* grass-user@lists.osgeo.org
*Subject:* Re: [GRASS-user] GRASS GIS through PyWPS bridge
Hi Nitendra,
your code says
"r.out.png","input=the/tiff/file","out=/the/png/file"
But r.out.png [1] is not converter between image formats (this is what
ImageMagic does [2]). If the images are georeferenced then GDAL [3] is the
right option for file format conversion. r.out.png exports GRASS raster
map, so input should be GRASS raster map not a tiff file.
If you want to use GRASS for this conversion (e.g. this conversion is
only example process and in fact you want to do some serious processing in
GRASS), you need to import the tiff file first or link it as external map.
For import to GRASS use r.in.gdal [4]. For linking the tiff file as
external map use r.external [5].
Note that if the tiff has colors it will be splitted into three maps and
if you want to show it as one RGB map, you need to use r.composite [6].
Than you can do what ever processing you want and then export the result
as PNG using r.out.png.
Hope that helps,
Vaclav
[1] http://grass.osgeo.org/grass70/manuals/r.out.png.html
[2] http://www.imagemagick.org
[3] http://www.gdal.org/
[4] http://grass.osgeo.org/grass70/manuals/r.in.gdal.html
[5] http://grass.osgeo.org/grass70/manuals/r.external.html
[6] http://grass.osgeo.org/grass70/manuals/r.composite.html
On Wed, Dec 4, 2013 at 3:19 PM, Nitendra Gautam <
nitendra.gautam@my.ndsu.edu> wrote:
Hi all,
I want to make a simple web page that uses web processing capabilities
of GRASS as a back end and displays image on the webpage.I am using CGI
interface of python and PyWPS bridge connecting them .
right now my web page(http://134.129.125.124/) displays a normal JPG
image by from <JPG image button>.
I want to write a simple python script which uses Grass GIS to convert a
TIFF image to png or other formats.This script should run as a back end.
I have pasted my script (http://pastie.org/8529097).But its not working
right now.
Can you please give me suggestions ?
Thank You
Nitendra
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