Jeff, The code snippet has been provided, if you run it with the csv reading code instead of my binary file reading code you'll see it works
I have added some points at each corner of the map (-180:90 180:90 -180:-90 180:-90) with zero values and the white gap persists If you cannot help me, that's not a problem, I just cannot give you a better explanation... Empty data is something normal in my files, sometimes the satellite has gaps on its measurements and empty zones on the map are normal The only problem is that it surrounds all the plot with a grayish border or shadow when I plot it (a mickey-shaped data plot with white zeroed values would give a mickey-shaped grey border), and all I want to know is if it is normal that imshow has such a border, and if it is possible that it comes from the library I'll keep searching till I have a solution Is there another plotting method than imshow which also has interpolation? Antoine De Pauw Collaborateur de recherches, Informatique - Research collaborator, IT Laboratoire de chimie quantique et photophysique - Quantum chemistry and photophysics laboratory Université Libre de Bruxelles - ULB -----Original Message----- From: Jeff Whitaker [mailto:[EMAIL PROTECTED] Sent: lundi 22 septembre 2008 13:59 To: De Pauw Antoine Cc: 'John Hunter'; 'Matplotlib Users' Subject: Re: [Matplotlib-users] Information request De Pauw Antoine wrote: > Jeff, > > I included here a figure where you'll see the border problem for imshow in > my case > > http://img217.imageshack.us/img217/5240/testfigzp3.png > > The border wraps at -180 and 180 to form the white line > > PS: it is atmospheric ice and not SO2, I just omitted to change the title ^^ > > Antoine De Pauw > Collaborateur de recherches, Informatique - Research collaborator, IT > Laboratoire de chimie quantique et photophysique - Quantum chemistry and > photophysics laboratory > Université Libre de Bruxelles - ULB > Antoine: I hate to keep repeating myself - but we can't do much if you don't provide a self-contained script, that I can run, which reproduces the problem. My guess is that the line along the dateline, and the point at the South Pole are missing values (which griddata set to missing because they are outside the extent of the data) - but that's just a guess until I can reproduce it. -Jeff > > -----Original Message----- > From: Antoine De Pauw [mailto:[EMAIL PROTECTED] > Sent: jeudi 18 septembre 2008 17:23 > To: Jeff Whitaker; [EMAIL PROTECTED] > Cc: 'John Hunter'; 'Matplotlib Users' > Subject: re:Re: [Matplotlib-users] Information request > > Jeff, > > No the example doesn't show that line > > If I reduce the amount of data, the border will be on every side of the plot > > I'll show you an orthographic plot with no maskinf tomorrow and you will see > the problem easily, it wraps in a white line along the 0° meridian and a > white circle in the pole > > I think it's the imshow layer that is not totally transparent on the map > background.. I tried every trick I could for example to put some zero-valued > points on each corner to make imshow interpolate correctly the sides, but > that doesn't make any difference > > >> De Pauw Antoine wrote: >> >>> Jeff, >>> >>> Yes they disappear, and they fluctuate with the interpolation method used >>> >>> For example, nearest interpolation don't show the line >>> >>> Also, if I reduce the grid resolution, the line is thicker, and if I use >>> > a > >>> masked array to get rid of undesired values, the border shows really >>> strongly >>> >>> Here's an example everyone will see: >>> >>> http://img225.imageshack.us/img225/2671/testfigep2.png >>> >>> (everything except the clouds is noise) >>> >>> Antoine De Pauw >>> Collaborateur de recherches, Informatique - Research collaborator, IT >>> Laboratoire de chimie quantique et photophysique - Quantum chemistry and >>> photophysics laboratory >>> Université Libre de Bruxelles - ULB >>> >>> >> Antoine: Sorry to seem dense, but I don't see anything wrong with that >> plot. I see a white border along the north and south pole, but I >> intrepret that to be missing values. However, my eyes are notoriously >> bad. I'd like to be to run a script that generates the artifacts >> myself, so I can zoom in and see the problem myself. Does the >> griddata_demo.py script show the same problem for you? >> >> -Jeff >> >>> -----Original Message----- >>> From: Jeff Whitaker [mailto:[EMAIL PROTECTED] >>> Sent: mercredi 17 septembre 2008 19:05 >>> To: John Hunter >>> Cc: De Pauw Antoine; Matplotlib Users >>> Subject: Re: [Matplotlib-users] Information request >>> >>> John Hunter wrote: >>> >>> >>>> On Wed, Sep 17, 2008 at 11:54 AM, John Hunter <[EMAIL PROTECTED]> wrote: >>>> >>>> >>>> >>>> >>>>> Attached is a screenshot (zoom.png) from the gimp, zoomed in near the >>>>> axes border. The black horizontal line is the top axes border, the >>>>> horizontal grey line is the artifact, the vertical dashed line is a >>>>> grid line. I don't know if this offers a clue, but if you look at a >>>>> zoom in the upper right corner, the grey line seems to break up and >>>>> curve down and to the right (corner.png) >>>>> >>>>> >>>>> >>>> Sorry, screwed up corner.png (I attached the original and not the >>>> screenshot). The correct screenshot is attached >>>> >>>> >>>> >>>> >>>> >>> John: OK, now I finally see it. Antoine: Do these artifacts >>> disappear if you comment out the imshow call? >>> >>> -Jeff >>> >>> >>> >> -- >> Jeffrey S. Whitaker Phone : (303)497-6313 >> Meteorologist FAX : (303)497-6449 >> NOAA/OAR/PSD R/PSD1 Email : [EMAIL PROTECTED] >> 325 Broadway Office : Skaggs Research Cntr 1D-113 >> Boulder, CO, USA 80303-3328 Web : http://tinyurl.com/5telg >> >> >> >> > > > -- Jeffrey S. Whitaker Phone : (303)497-6313 NOAA/OAR/CDC R/PSD1 FAX : (303)497-6449 325 Broadway Boulder, CO, USA 80305-3328 ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
