could I get rid of the contour of Antarctica by using Basemap?

Community matplotlib-users
1

Dear all,

Happy new year!

I am using Basemap toolkit to make some maps, I would like to

write something at the bottom of the map, whose position is now

taken by the contourf of Antarctica. Is there a way I can keep contours
of other continents but suppressing the one for antarctica? I attached

showing why I would like to have this.

thanks for any help,

Chao

figure_4_new.jpg

···

–

Chao YUE
Laboratoire des Sciences du Climat et de l’Environnement (LSCE-IPSL)
UMR 1572 CEA-CNRS-UVSQ
Batiment 712 - Pe 119
91191 GIF Sur YVETTE Cedex

Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16

2

Chao,

I know nothing of the Basemap toolkit so I can't comment on the removal of continents, but presumably the text command you are using takes some keywords to set the properties of the bounding box. Try setting the background of the bounding box to white so that your words show up cleanly. Feel free to let me know that I'm barking up the wrong tree.

-Sterling

···

On Dec 30, 2013, at 3:46PM, Chao YUE wrote:

Dear all,

Happy new year!

I am using Basemap toolkit to make some maps, I would like to
write something at the bottom of the map, whose position is now
taken by the contourf of Antarctica. Is there a way I can keep contours
of other continents but suppressing the one for antarctica? I attached
showing why I would like to have this.

thanks for any help,

Chao
--
***********************************************************************************
Chao YUE
Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL)
UMR 1572 CEA-CNRS-UVSQ
Batiment 712 - Pe 119
91191 GIF Sur YVETTE Cedex
Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16
************************************************************************************
<figure_4_new.jpg>------------------------------------------------------------------------------
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3

Hi Chao,

Actually it is possible to remove the borders for Antarctica with basemap. The default method for drawing the continents in basemap, drawcontinents(), returns an instance of matplotlib.collections.LineCollection. What you will want to do is manually remove the line segments within the collection that correspond to Antarctica. For example,

m is a Basemap instance

lcol = m.drawcoastlines()

segs = lcol.get_segments()

for i, seg in enumerate(segs):

The segments are lists of ordered pairs in spherical (lon, lat), coordinates.

We can filter out which ones correspond to Antarctica based on latitude using numpy.any()

if np.any(seg[:, 1] < -60):

segs.pop(i)

lcol.set_segments(segs)

This should do the trick unless I made a silly typo somewhere.

Thanks,
Alex

no_antarctica.png
no_antarctica.png800×600 21.1 KB

···

On Mon, Dec 30, 2013 at 5:05 PM, Sterling Smith <smithsp@…3304…> wrote:

Chao,

I know nothing of the Basemap toolkit so I can’t comment on the removal of continents, but presumably the text command you are using takes some keywords to set the properties of the bounding box. Try setting the background of the bounding box to white so that your words show up cleanly. Feel free to let me know that I’m barking up the wrong tree.

-Sterling

On Dec 30, 2013, at 3:46PM, Chao YUE wrote:

Dear all,

Happy new year!

I am using Basemap toolkit to make some maps, I would like to

write something at the bottom of the map, whose position is now

taken by the contourf of Antarctica. Is there a way I can keep contours

of other continents but suppressing the one for antarctica? I attached

showing why I would like to have this.

thanks for any help,

Chao

–

Chao YUE

Laboratoire des Sciences du Climat et de l’Environnement (LSCE-IPSL)

UMR 1572 CEA-CNRS-UVSQ

Batiment 712 - Pe 119

91191 GIF Sur YVETTE Cedex

Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16

<figure_4_new.jpg>------------------------------------------------------------------------------

Rapidly troubleshoot problems before they affect your business. Most IT

organizations don’t have a clear picture of how application performance

affects their revenue. With AppDynamics, you get 100% visibility into your

Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro!

http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk_______________________________________________

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–
Alex Goodman
Graduate Research Assistant

Department of Atmospheric Science

Colorado State University

4

A quick apology for a typo in my previous message, the method in question is drawcoastlines(), not drawcontinents(). The code snippet should still be correct though!

···

On Mon, Dec 30, 2013 at 7:09 PM, Alex Goodman <alex.goodman@…4444…> wrote:

Hi Chao,

Actually it is possible to remove the borders for Antarctica with basemap. The default method for drawing the continents in basemap, drawcontinents(), returns an instance of matplotlib.collections.LineCollection. What you will want to do is manually remove the line segments within the collection that correspond to Antarctica. For example,

m is a Basemap instance

lcol = m.drawcoastlines()

segs = lcol.get_segments()

for i, seg in enumerate(segs):

The segments are lists of ordered pairs in spherical (lon, lat), coordinates.

We can filter out which ones correspond to Antarctica based on latitude using numpy.any()

if np.any(seg[:, 1] < -60):

segs.pop(i)

lcol.set_segments(segs)

This should do the trick unless I made a silly typo somewhere.

Thanks,
Alex

–
Alex Goodman
Graduate Research Assistant

Department of Atmospheric Science

Colorado State University

On Mon, Dec 30, 2013 at 5:05 PM, Sterling Smith <smithsp@…3304…> wrote:

Chao,

I know nothing of the Basemap toolkit so I can’t comment on the removal of continents, but presumably the text command you are using takes some keywords to set the properties of the bounding box. Try setting the background of the bounding box to white so that your words show up cleanly. Feel free to let me know that I’m barking up the wrong tree.

-Sterling

On Dec 30, 2013, at 3:46PM, Chao YUE wrote:

Dear all,

Happy new year!

I am using Basemap toolkit to make some maps, I would like to

write something at the bottom of the map, whose position is now

taken by the contourf of Antarctica. Is there a way I can keep contours

of other continents but suppressing the one for antarctica? I attached

showing why I would like to have this.

thanks for any help,

Chao

–

Chao YUE

Laboratoire des Sciences du Climat et de l’Environnement (LSCE-IPSL)

UMR 1572 CEA-CNRS-UVSQ

Batiment 712 - Pe 119

91191 GIF Sur YVETTE Cedex

Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16

<figure_4_new.jpg>------------------------------------------------------------------------------

Rapidly troubleshoot problems before they affect your business. Most IT

organizations don’t have a clear picture of how application performance

affects their revenue. With AppDynamics, you get 100% visibility into your

Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro!

http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk_______________________________________________

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organizations don’t have a clear picture of how application performance

affects their revenue. With AppDynamics, you get 100% visibility into your

Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro!

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Alex Goodman
Graduate Research Assistant

Department of Atmospheric Science

Colorado State University

–

5

Hi Sterling and Alex,

thanks to both of you. I followed what proposed by you Alex and it’s working perfectly.

my version of matplotlib is 1.2.0 and I don’t want to upgrade before I submit the MS and

so I pick up the code of “get_segments” method from the github and put it in my 1.2.0
matplotlib and it works.

I wish everybody a good new year.

Chao

···

On Tue, Dec 31, 2013 at 3:09 AM, Alex Goodman <alex.goodman@…4444…> wrote:

Hi Chao,

Actually it is possible to remove the borders for Antarctica with basemap. The default method for drawing the continents in basemap, drawcontinents(), returns an instance of matplotlib.collections.LineCollection. What you will want to do is manually remove the line segments within the collection that correspond to Antarctica. For example,

m is a Basemap instance

lcol = m.drawcoastlines()

segs = lcol.get_segments()

for i, seg in enumerate(segs):

The segments are lists of ordered pairs in spherical (lon, lat), coordinates.

We can filter out which ones correspond to Antarctica based on latitude using numpy.any()

if np.any(seg[:, 1] < -60):

segs.pop(i)

lcol.set_segments(segs)

This should do the trick unless I made a silly typo somewhere.

Thanks,
Alex

–

Chao YUE
Laboratoire des Sciences du Climat et de l’Environnement (LSCE-IPSL)
UMR 1572 CEA-CNRS-UVSQ
Batiment 712 - Pe 119
91191 GIF Sur YVETTE Cedex

Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16

On Mon, Dec 30, 2013 at 5:05 PM, Sterling Smith <smithsp@…3304…> wrote:

Chao,

I know nothing of the Basemap toolkit so I can’t comment on the removal of continents, but presumably the text command you are using takes some keywords to set the properties of the bounding box. Try setting the background of the bounding box to white so that your words show up cleanly. Feel free to let me know that I’m barking up the wrong tree.

-Sterling

On Dec 30, 2013, at 3:46PM, Chao YUE wrote:

Dear all,

Happy new year!

I am using Basemap toolkit to make some maps, I would like to

write something at the bottom of the map, whose position is now

taken by the contourf of Antarctica. Is there a way I can keep contours

of other continents but suppressing the one for antarctica? I attached

showing why I would like to have this.

thanks for any help,

Chao

–

Chao YUE

Laboratoire des Sciences du Climat et de l’Environnement (LSCE-IPSL)

UMR 1572 CEA-CNRS-UVSQ

Batiment 712 - Pe 119

91191 GIF Sur YVETTE Cedex

Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16

<figure_4_new.jpg>------------------------------------------------------------------------------

Rapidly troubleshoot problems before they affect your business. Most IT

organizations don’t have a clear picture of how application performance

affects their revenue. With AppDynamics, you get 100% visibility into your

Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro!

http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk_______________________________________________

Matplotlib-users mailing list

Matplotlib-users@lists.sourceforge.net

https://lists.sourceforge.net/lists/listinfo/matplotlib-users

Rapidly troubleshoot problems before they affect your business. Most IT

organizations don’t have a clear picture of how application performance

affects their revenue. With AppDynamics, you get 100% visibility into your

Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro!

http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk

Matplotlib-users mailing list

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Alex Goodman
Graduate Research Assistant

Department of Atmospheric Science

Colorado State University

–