On Fri, Dec 6, 2013 at 1:59 PM, Nitendra Gautam <[email protected] > 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 <[email protected]> > *Sent:* Friday, December 06, 2013 9:15 AM > *To:* Nitendra Gautam > *Cc:* [email protected] > *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 < > [email protected]> 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 >> >> >> >> >> >> _______________________________________________ >> grass-user mailing list >> [email protected] >> http://lists.osgeo.org/mailman/listinfo/grass-user >> > >
_______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
