Re moving white space surrounding plots

Martin_De_Kauwe · June 8, 2010, 11:47pm

Hi,

when I make plots with the Basemap package I seem to be getting a large
amount of white space at the top and bottom of the plot, even if I use the
option bbox_inches='tight'. Does anyone know how I can stop this happening?

Example image...
http://old.nabble.com/file/p28824528/diffmap_JULES_DJF_snowFrac.GSWP2_vs_SSMI.jpg

What I am currently doing...

def makeMap(image, ofname, imageMin, imageMax, ticks):
    """ dump out the array as a nice map... """
    fig = plt.figure(figsize=(8, 6))
    m = Basemap(projection='cyl', llcrnrlon=-179.5, llcrnrlat=-60.0, \
                        urcrnrlon=179.5, urcrnrlat=89.5, resolution='c')
    # add an axes, leaving room for colorbar on the right.
    ax = fig.add_axes([0.1, 0.1, 0.7, 0.7])
    m.ax = ax
    colourmap = plt.cm.RdYlBu
    colourmap.set_bad('w', 1.0)
    im = m.imshow(image, colourmap, colors.Normalize(vmin=imageMin,
vmax=imageMax, clip=False),\
                           interpolation='nearest')
    pos = ax.get_position()
    l, b, w, h = pos.bounds
    cax = plt.axes([l + w + 0.045, b, 0.05, h])
    norm = colors.BoundaryNorm(ticks, colourmap.N)
    cbar = mpl.colorbar.ColorbarBase(cax, cmap=colourmap, norm=norm,
ticks=ticks)
    #cbar = plt.colorbar(im, cax=cax)
    # xlabel and ylabel were overwriting the tick labels so i need to move
them
    # transAxes set the position from the bottom left of the axes (1,1 would
be the top right)
    ax.text(0.5, -0.15, 'Longitude', transform=ax.transAxes, ha='center',
va='center')
    ax.text(-0.1, 0.5, 'Latitude', transform=ax.transAxes, ha= 'center',
va='center', rotation='vertical')
    #ax.set_title("Sign.Different: GSPW2 - Princeton")
    m.drawcoastlines(linewidth=0.2, color='k')
    m.drawcountries(linewidth=0.1, color='k')
    #m.drawrivers()
    m.drawparallels(np.array([-90.0, -60.0, -30.0, 0.0, 30.0, 60.0, 90.0]),
labels=[1,0,0,1],\
                           fontsize=10, rotation=20)
    m.drawmeridians(np.array([-180.0, -120.0, -60.0, 0.0, 60.0, 120.0,
180.0]), labels=[0,0,0,1], \
                            fontsize=10, rotation=20)
    fig.savefig(ofname + '.png', dpi=300, bbox_inches='tight')
    # for LaTeX doc...
    fig.savefig(os.path.join("/users/eow/mgdk/doc/snowy_notes/figures/",
(ofname + ".eps")), dpi=300,\
                   bbox_inches='tight')

Many thanks,

Martin

···

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Martin_De_Kauwe · June 8, 2010, 11:50pm

Note - in case it isn't clear that white space between where I mention the
example and the image is what I am referring to and below it again.

mdekauwe wrote:

···

Hi,

when I make plots with the Basemap package I seem to be getting a large
amount of white space at the top and bottom of the plot, even if I use the
option bbox_inches='tight'. Does anyone know how I can stop this
happening?

Example image...

http://old.nabble.com/file/p28824528/diffmap_JULES_DJF_snowFrac.GSWP2_vs_SSMI.jpg

What I am currently doing...

def makeMap(image, ofname, imageMin, imageMax, ticks):
    """ dump out the array as a nice map... """
    fig = plt.figure(figsize=(8, 6))
    m = Basemap(projection='cyl', llcrnrlon=-179.5, llcrnrlat=-60.0, \
                        urcrnrlon=179.5, urcrnrlat=89.5, resolution='c')
    # add an axes, leaving room for colorbar on the right.
    ax = fig.add_axes([0.1, 0.1, 0.7, 0.7])
    m.ax = ax
    colourmap = plt.cm.RdYlBu
    colourmap.set_bad('w', 1.0)
    im = m.imshow(image, colourmap, colors.Normalize(vmin=imageMin,
vmax=imageMax, clip=False),\
                           interpolation='nearest')
    pos = ax.get_position()
    l, b, w, h = pos.bounds
    cax = plt.axes([l + w + 0.045, b, 0.05, h])
    norm = colors.BoundaryNorm(ticks, colourmap.N)
    cbar = mpl.colorbar.ColorbarBase(cax, cmap=colourmap, norm=norm,
ticks=ticks)
    #cbar = plt.colorbar(im, cax=cax)
    # xlabel and ylabel were overwriting the tick labels so i need to move
them
    # transAxes set the position from the bottom left of the axes (1,1
would be the top right)
    ax.text(0.5, -0.15, 'Longitude', transform=ax.transAxes, ha='center',
va='center')
    ax.text(-0.1, 0.5, 'Latitude', transform=ax.transAxes, ha= 'center',
va='center', rotation='vertical')
    #ax.set_title("Sign.Different: GSPW2 - Princeton")
    m.drawcoastlines(linewidth=0.2, color='k')
    m.drawcountries(linewidth=0.1, color='k')
    #m.drawrivers()
    m.drawparallels(np.array([-90.0, -60.0, -30.0, 0.0, 30.0, 60.0,
90.0]), labels=[1,0,0,1],\
                           fontsize=10, rotation=20)
    m.drawmeridians(np.array([-180.0, -120.0, -60.0, 0.0, 60.0, 120.0,
180.0]), labels=[0,0,0,1], \
                            fontsize=10, rotation=20)
    fig.savefig(ofname + '.png', dpi=300, bbox_inches='tight')
    # for LaTeX doc...
    fig.savefig(os.path.join("/users/eow/mgdk/doc/snowy_notes/figures/",
(ofname + ".eps")), dpi=300,\
                   bbox_inches='tight')

Many thanks,

Martin

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_Jae-Joon_Lee1 · June 9, 2010, 6:28pm

What version of matplotlib are you using?
With 0.99.1.1 (and likely later) and also with the svn version, using
the bbox_inches="tight" actually produces an output with too small
margin.
With the svn version, following code should generate an output with an
adequate margin.

Otherwise, you cannot rely on bbox_inches features. Instead, you have
to manually adjust the size of the figure (and subplots_adjust).

Regards,

-JJ

   t1=ax.text(0.5, -0.15, 'Longitude', transform=ax.transAxes,
ha='center', va='center')
   t2=ax.text(-0.1, 0.5, 'Latitude', transform=ax.transAxes, ha=
'center', va='center', rotation='vertical')
   #ax.set_title("Sign.Different: GSPW2 - Princeton")
   fig.savefig('test.png', dpi=300, bbox_inches='tight',
bbox_extra_artists=[t1, t2])

···

On Tue, Jun 8, 2010 at 7:47 PM, mdekauwe <mdekauwe@...287...> wrote:

Hi,

when I make plots with the Basemap package I seem to be getting a large
amount of white space at the top and bottom of the plot, even if I use the
option bbox_inches='tight'. Does anyone know how I can stop this happening?

Example image...
http://old.nabble.com/file/p28824528/diffmap_JULES_DJF_snowFrac.GSWP2_vs_SSMI.jpg

What I am currently doing...

def makeMap(image, ofname, imageMin, imageMax, ticks):
""" dump out the array as a nice map... """
fig = plt.figure(figsize=(8, 6))
m = Basemap(projection='cyl', llcrnrlon=-179.5, llcrnrlat=-60.0, \
urcrnrlon=179.5, urcrnrlat=89.5, resolution='c')
# add an axes, leaving room for colorbar on the right.
ax = fig.add_axes([0.1, 0.1, 0.7, 0.7])
m.ax = ax
colourmap = plt.cm.RdYlBu
colourmap.set_bad('w', 1.0)
im = m.imshow(image, colourmap, colors.Normalize(vmin=imageMin,
vmax=imageMax, clip=False),\
interpolation='nearest')
pos = ax.get_position()
l, b, w, h = pos.bounds
cax = plt.axes([l + w + 0.045, b, 0.05, h])
norm = colors.BoundaryNorm(ticks, colourmap.N)
cbar = mpl.colorbar.ColorbarBase(cax, cmap=colourmap, norm=norm,
ticks=ticks)
#cbar = plt.colorbar(im, cax=cax)
# xlabel and ylabel were overwriting the tick labels so i need to move
them
# transAxes set the position from the bottom left of the axes (1,1 would
be the top right)
ax.text(0.5, -0.15, 'Longitude', transform=ax.transAxes, ha='center',
va='center')
ax.text(-0.1, 0.5, 'Latitude', transform=ax.transAxes, ha= 'center',
va='center', rotation='vertical')
#ax.set_title("Sign.Different: GSPW2 - Princeton")
m.drawcoastlines(linewidth=0.2, color='k')
m.drawcountries(linewidth=0.1, color='k')
#m.drawrivers()
m.drawparallels(np.array([-90.0, -60.0, -30.0, 0.0, 30.0, 60.0, 90.0]),
labels=[1,0,0,1],\
fontsize=10, rotation=20)
m.drawmeridians(np.array([-180.0, -120.0, -60.0, 0.0, 60.0, 120.0,
180.0]), labels=[0,0,0,1], \
fontsize=10, rotation=20)
fig.savefig(ofname + '.png', dpi=300, bbox_inches='tight')
# for LaTeX doc...
fig.savefig(os.path.join("/users/eow/mgdk/doc/snowy_notes/figures/",
(ofname + ".eps")), dpi=300,\
bbox_inches='tight')

Many thanks,

Martin
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Martin_De_Kauwe · June 10, 2010, 1:28pm

Hmm OK thanks. It seems I am using

In [3]: matplotlib.__version__
Out[3]: '0.98.5.3'

so by the sounds of it an outdated version? But your example will work on a
newer version?

What version of matplotlib are you using?
With 0.99.1.1 (and likely later) and also with the svn version, using
the bbox_inches="tight" actually produces an output with too small
margin.
With the svn version, following code should generate an output with an
adequate margin.

Otherwise, you cannot rely on bbox_inches features. Instead, you have
to manually adjust the size of the figure (and subplots_adjust).

Regards,

-JJ

   t1=ax.text(0.5, -0.15, 'Longitude', transform=ax.transAxes,
ha='center', va='center')
   t2=ax.text(-0.1, 0.5, 'Latitude', transform=ax.transAxes, ha=
'center', va='center', rotation='vertical')
   #ax.set_title("Sign.Different: GSPW2 - Princeton")
   fig.savefig('test.png', dpi=300, bbox_inches='tight',
bbox_extra_artists=[t1, t2])

···

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_Jae-Joon_Lee1 · June 10, 2010, 3:46pm

I think bbox_inches option is not supported with your version of matplotlib.
You may upgrade to newer version, or you have to manually adjust the
figure size etc.

Regards,

-JJ

···

On Thu, Jun 10, 2010 at 9:28 AM, mdekauwe <mdekauwe@...287...> wrote:

so by the sounds of it an outdated version? But your example will work on a
newer version?

Martin_De_Kauwe · June 10, 2010, 5:55pm

Hi

OK assuming upgrading is going to be a hassle. I just looked into and some
of the libraries need changing etc etc. Do you know what I would change as a
short term work around?

When you said adjust size, did you mean this line

fig = plt.figure(figsize=(8, 6))

or this

ax = fig.add_axes([0.1, 0.1, 0.7, 0.7])

?

Thanks

Jae-Joon Lee wrote:

···

On Thu, Jun 10, 2010 at 9:28 AM, mdekauwe <mdekauwe@...287...> wrote:

so by the sounds of it an outdated version? But your example will work on
a
newer version?

I think bbox_inches option is not supported with your version of
matplotlib.
You may upgrade to newer version, or you have to manually adjust the
figure size etc.

Regards,

-JJ

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_Jae-Joon_Lee1 · June 10, 2010, 6:14pm

This.
Also play with subplots_adjust.

-JJ

···

On Thu, Jun 10, 2010 at 1:55 PM, mdekauwe <mdekauwe@...287...> wrote:

fig = plt.figure(figsize=(8, 6))

Martin_De_Kauwe · June 10, 2010, 8:41pm

Unless I am mistaken subplots_adjust doesn't do anything as I am building an
axes instance. Doing...

fig = plt.figure(figsize=(8, 4))
ax = fig.add_axes([0.1, 0.15, 0.7, 0.7])

has shrunk the white space, though I think the font of the legend looks a
bit less well defined, but perhaps that is just my eyes!
http://old.nabble.com/file/p28848239/diffmap_JULES_DJF_snowFrac.GSWP2_vs_SSMI.jpeg

Jae-Joon Lee wrote:

···

On Thu, Jun 10, 2010 at 1:55 PM, mdekauwe <mdekauwe@...287...> wrote:

fig = plt.figure(figsize=(8, 6))

This.
Also play with subplots_adjust.

-JJ

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Benjamin_Root · June 10, 2010, 9:13pm

Just to make sure, were you calling subplots_adjust() before calling subplot()? Calling it after subplot() shouldn’t have an effect on the already created axes (I think…).

Ben Root

···

On Thu, Jun 10, 2010 at 3:41 PM, mdekauwe <mdekauwe@…287…> wrote:

Unless I am mistaken subplots_adjust doesn’t do anything as I am building an

axes instance. Doing…

fig = plt.figure(figsize=(8, 4))

ax = fig.add_axes([0.1, 0.15, 0.7, 0.7])

has shrunk the white space, though I think the font of the legend looks a

bit less well defined, but perhaps that is just my eyes!

http://old.nabble.com/file/p28848239/diffmap_JULES_DJF_snowFrac.GSWP2_vs_SSMI.jpeg

Jae-Joon Lee wrote:

On Thu, Jun 10, 2010 at 1:55 PM, mdekauwe <mdekauwe@…287…> wrote:

fig = plt.figure(figsize=(8, 6))

This.

Also play with subplots_adjust.

-JJ

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Martin_De_Kauwe · June 10, 2010, 9:28pm

Hi,

yes as I understand it (happy to be corrected)...

fig = plt.figure(figsize=(8, 4))
fig.subplots_adjust(bottom=0.05)

does nothing unless you also do

ax = fig.add_subplot(111)

but as I am also doing

ax = fig.add_axes([0.1, 0.15, 0.7, 0.7]), it means I would just get two
frames.

Benjamin Root-2 wrote:

···

Just to make sure, were you calling subplots_adjust() *before* calling
subplot()? Calling it after subplot() shouldn't have an effect on the
already created axes (I think...).

Ben Root

On Thu, Jun 10, 2010 at 3:41 PM, mdekauwe <mdekauwe@...287...> wrote:

Unless I am mistaken subplots_adjust doesn't do anything as I am building
an
axes instance. Doing...

fig = plt.figure(figsize=(8, 4))
ax = fig.add_axes([0.1, 0.15, 0.7, 0.7])

has shrunk the white space, though I think the font of the legend looks a
bit less well defined, but perhaps that is just my eyes!

http://old.nabble.com/file/p28848239/diffmap_JULES_DJF_snowFrac.GSWP2_vs_SSMI.jpeg

Jae-Joon Lee wrote:
>
> On Thu, Jun 10, 2010 at 1:55 PM, mdekauwe <mdekauwe@...287...> wrote:
>> fig = plt.figure(figsize=(8, 6))
>
> This.
> Also play with subplots_adjust.
>
> -JJ
>
>
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