# Retrives using pydda

**URL:** <https://openradar.discourse.group/t/retrives-using-pydda/539>\
**Category:** Retrievals\
**Created:** [December 1, 2024, 2:07pm UTC](https://openradar.discourse.group/t/retrives-using-pydda/539 "2024-12-01T14:07:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Amani](https://avatars.discourse-cdn.com/v4/letter/a/c2a13f/32.png) [@Amani](https://openradar.discourse.group/u/Amani)\
**Post date:** [December 1, 2024, 2:07pm UTC](https://openradar.discourse.group/t/retrives-using-pydda/539/1 "2024-12-01T14:07:08Z")

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It is my first time using Pydda, I try to retrieves wind from sounding and radar data using iris sigmet format  
I try to apply this tutorial  
[https://openradarscience.org/ams-open-radar-2023/notebooks/pydda/Retrieving\_winds\_with\_pydda.html](https://openradarscience.org/ams-open-radar-2023/notebooks/pydda/Retrieving_winds_with_pydda.html)  
it working until the PyDDA wind retrieval, I get an error ( KeyError: “No variable named ‘origin\_latitude’. Variables on the dataset include [‘time’, ‘z’, ‘lat’, ‘lon’, ‘y’, …, ‘differential\_reflectivity’, ‘ROI’, ‘u’, ‘v’, ‘w’]”  
how can I solve this error?

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**Author:** ![syedhamidali](https://yyz2.discourse-cdn.com/free1/user_avatar/openradar.discourse.group/syedhamidali/32/377_2.png) [@syedhamidali](https://openradar.discourse.group/u/syedhamidali)\
**Post date:** [December 4, 2024, 9:54pm UTC](https://openradar.discourse.group/t/retrives-using-pydda/539/2 "2024-12-04T21:54:07Z")

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You need to grid the data using Pyart first, which should give its origin latitude and longitude. Otherwise, you can manually assign these parameters if the data is already gridded.