matplotlib-users

[Matplotlib-users] Basemap:'snapback' on line crossing global plot edge

[James B. <bo...@ll...>]

This is probably for Jeff but maybe someone else has an answer.
If I plot a satellite orbit on the globe when the groundtrack passes  
the edge of the map - in this case the Greenwich meridian  - the  
line  'snaps back ' across the plot where the line picks up on the  
other side of the globe.
The attached plot shows the problem, note the line across the  
northern polar regions. I have encountered this before. In this case  
I can break the ground track into two segments, one up to and  
including Greenwich and the other from Greenwich eastward.

My question: Is there a more elegant way to deal with this situation  
in Basemap? I have a nagging feeling that Jeff has addressed this  
issue but I cannot find anything in the examples.

--Jim

Re: [Matplotlib-users] Basemap:'snapback' on line crossing global plot edge

[Ted D. <ted...@jp...>]

I don't think so.  We always manually check for horizontal and 
vertical axis crossings and split the line as many times as necessary.

At 03:31 PM 8/2/2007, James Boyle wrote:
>This is probably for Jeff but maybe someone else has an answer.
>If I plot a satellite orbit on the globe when the groundtrack passes
>the edge of the map - in this case the Greenwich meridian  - the
>line  'snaps back ' across the plot where the line picks up on the
>other side of the globe.
>The attached plot shows the problem, note the line across the
>northern polar regions. I have encountered this before. In this case
>I can break the ground track into two segments, one up to and
>including Greenwich and the other from Greenwich eastward.
>
>My question: Is there a more elegant way to deal with this situation
>in Basemap? I have a nagging feeling that Jeff has addressed this
>issue but I cannot find anything in the examples.
>
>--Jim
>
>
>
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Re: [Matplotlib-users] Basemap:'snapback' on line crossing global plot edge

[Jeff W. <js...@fa...>]

Ted Drain wrote:
> I don't think so.  We always manually check for horizontal and 
> vertical axis crossings and split the line as many times as necessary.
>   

One other solution  might be to not plot a line, but use scatter to plot 
the individual points.  If there are enough of them, it will look OK.

-Jeff
> At 03:31 PM 8/2/2007, James Boyle wrote:
>   
>> This is probably for Jeff but maybe someone else has an answer.
>> If I plot a satellite orbit on the globe when the groundtrack passes
>> the edge of the map - in this case the Greenwich meridian  - the
>> line  'snaps back ' across the plot where the line picks up on the
>> other side of the globe.
>> The attached plot shows the problem, note the line across the
>> northern polar regions. I have encountered this before. In this case
>> I can break the ground track into two segments, one up to and
>> including Greenwich and the other from Greenwich eastward.
>>
>> My question: Is there a more elegant way to deal with this situation
>> in Basemap? I have a nagging feeling that Jeff has addressed this
>> issue but I cannot find anything in the examples.
>>
>> --Jim
>>
>>
>>
>> -------------------------------------------------------------------------
>> This SF.net email is sponsored by: Splunk Inc.
>> Still grepping through log files to find problems?  Stop.
>> Now Search log events and configuration files using AJAX and a browser.
>> Download your FREE copy of Splunk now >>  http://get.splunk.com/
>> _______________________________________________
>> Matplotlib-users mailing list
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>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>     
>
>
> -------------------------------------------------------------------------
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> Still grepping through log files to find problems?  Stop.
> Now Search log events and configuration files using AJAX and a browser.
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