# [SciPy-User] Obtaining contour data

Nicolas Cellier contact at nicolas-cellier.net
Mon Oct 16 10:28:25 EDT 2017

```If you fear that, you can easily map the raster coordinates to the real ones and convert this after extracting the contour. It's an extra step but should not be a real difficulty.

⁣Envoyé par TypeApp ​

Le 16 oct. 2017 16:25, à 16:25, "ashwin .D" <winash12 at gmail.com> a écrit:
>Yes I looked at that. The thing is my data is in raster
>coordinates(latitude and longitude - equidistant grid). When I pull out
>the
>coordinates from collections are these polygons (vectors) or is the
>raster
>entity still retained ?
>
>On Mon, Oct 16, 2017 at 7:50 PM, Nicolas Cellier <
>contact at nicolas-cellier.net> wrote:
>
>> It may help you
>>
>> https://stackoverflow.com/questions/5666056/matplotlib-
>> extracting-data-from-contour-lines
>>
>> 2017-10-16 15:31 GMT+02:00 ashwin .D <winash12 at gmail.com>:
>>
>>> Hello,
>>>          I have height data on a two  dimensional equidistant
>latitude
>>> longitude grid and my ultimate goal is to calculate the curvature of
>the
>>> contours. Here is an illustration of what I want to do -
>>>
>http://www.indiana.edu/%7Egeog109/topics/10_Forces&Winds/sfc_trough.html.
>>> The data is plotted on a two dimensional latitude longitude grid and
>then
>>> the height contours are calculated. I am looking to obtain the
>coordinates
>>> of the contours(shown in red) in terms of latitude and longitude so
>that I
>>> can use that information  to calculate the curvature of the contour
>points
>>> using a least squares method. Is it possible to do this in Scipy ?
>The
>>> curvature of the earth is itself irrelevant in this case and it can
>be
>>> assumed to be flat.
>>>
>>> Regards,
>>> Ashwin.
>>>
>>> _______________________________________________
>>> SciPy-User mailing list
>>> SciPy-User at python.org
>>> https://mail.python.org/mailman/listinfo/scipy-user
>>>
>>>
>>
>> _______________________________________________
>> SciPy-User mailing list
>> SciPy-User at python.org
>> https://mail.python.org/mailman/listinfo/scipy-user
>>
>>
>
>
>------------------------------------------------------------------------
>
>_______________________________________________
>SciPy-User mailing list
>SciPy-User at python.org
>https://mail.python.org/mailman/listinfo/scipy-user
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/scipy-user/attachments/20171016/e3d6717a/attachment-0001.html>
```

More information about the SciPy-User mailing list