Pyplot contour plot - clabel padding

Community matplotlib-users
1

I have trouble with matplotlib / pyplot / basemap. I plot contour lines (air
pressure) on a map. I use clabel to show the value of the contour lines. But
the problem: the padding between the value and the contour line is too much.
I have found the parameter "inline_spacing", which i have set to zero. But
there is still to much free space. Any ideas?

<http://matplotlib.1069221.n5.nabble.com/file/n44554/mslp.png>

My code is as follows:

Thanks a lot.

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2

Hi

Your code wans't included, but try setting your x and y limits *before* the call to clabel. I think that the problem is that clabel makes a space in the contours according to how large your font is, but if you then resize the plot (zoom in) then the blank space is too large for the labels.

Cheers, Jody

···

On Dec 4, 2014, at 17:47 PM, Sappy85 <robert.wittkopf@...380...> wrote:

I have trouble with matplotlib / pyplot / basemap. I plot contour lines (air
pressure) on a map. I use clabel to show the value of the contour lines. But
the problem: the padding between the value and the contour line is too much.
I have found the parameter "inline_spacing", which i have set to zero. But
there is still to much free space. Any ideas?

<http://matplotlib.1069221.n5.nabble.com/file/n44554/mslp.png&gt;

My code is as follows:

Thanks a lot.

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3

Hi Jody,

what exactly du you mean - the plot windows size?

I tried this:
fig = plt.figure(figsize=(8.4,5.76))

But still the same problem.

Regards

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4

I meant plt.xlim and plt.ylim. But its hard to tell what the problem is w/o some sample code.

Cheers, Jody

···

On Dec 5, 2014, at 1:07 AM, Sappy85 <robert.wittkopf@...380...> wrote:

Hi Jody,

what exactly du you mean - the plot windows size?

I tried this:
fig = plt.figure(figsize=(8.4,5.76))

But still the same problem.

Regards

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5

Hi Jody,

i have posted the code. Here again:

import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
from mpl_toolkits.basemap import Basemap
import pygrib

filename = "file.grib2"
grbs = pygrib.open('/data/' + filename)
grb = grbs[2]
data = grb.values
datac = data*0.01
lats, lons = grb.latlons()

fig = plt.figure()
m = Basemap(projection='stere',lon_0=5,lat_0=90.0,\
           
llcrnrlon=-25.0,urcrnrlon=60.0,llcrnrlat=30.0,urcrnrlat=60.0,resolution='l')

x, y = m(lons, lats)

levs = range(940,1065,5)
S1=plt.contour(x,y,datac,levs,linewidths=0.5,colors='b')
plt.clabel(S1,inline=1,inline_spacing=0,fontsize=8,fmt='%1.0f',colors='b')

m.drawmapboundary(fill_color='w')
m.drawcoastlines(linewidth=0.2)

plt.savefig('test.png', bbox_inches='tight',pad_inches=0.05, dpi=100)

Regards,
Sappy85

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6

Hi @all,
the problem seems to be solved. Thanks Jody!
What i have done:

1.) check out the xlim and ylim after clabel call
*xmin, xmax = plt.xlim() # return the current xlim
ymin, ymax = plt.ylim() # return the current ylim
print xmin,xmax
print ymin,ymax*

2.) use and set these limits before clabel call:
*plt.xlim(0.0,6475051.47849)
plt.ylim(0.0,4412688.31468)*

Yes, that's it. Very confusing! I do not understand why that only goes so
awkward?

Thanks so much!
Sappy85

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7

Not sure, as I don't use basemap too often, but I bet calling:

m.drawmapboundary(fill_color='w')

before clabel would do the trick

Cheers, Jody

···

On Dec 9, 2014, at 16:35 PM, Sappy85 <robert.wittkopf@...380...> wrote:

Hi @all,
the problem seems to be solved. Thanks Jody!
What i have done:

1.) check out the xlim and ylim after clabel call
*xmin, xmax = plt.xlim() # return the current xlim
ymin, ymax = plt.ylim() # return the current ylim
print xmin,xmax
print ymin,ymax*

2.) use and set these limits before clabel call:
*plt.xlim(0.0,6475051.47849)
plt.ylim(0.0,4412688.31468)*

Yes, that's it. Very confusing! I do not understand why that only goes so
awkward?

Thanks so much!
Sappy85

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8

Jody,

perfect - that work's fine.

Regards, Sappy85

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