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I'm working with an AIS dataset. The SOG (speed over ground) field has negative values, but the supported values are between 0 and 102.2 knots. How should I handle these values?

df.describe() of the dataset

afonsomm
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  • This sounds like a question about the AIS data itself and is only tangentially related to programming. You might want to consider asking this question on https://gis.stackexchange.com instead. – shadowtalker Apr 18 '23 at 12:34
  • Can you post the corresponding NMEA sentence? – tbsalling Apr 25 '23 at 07:27
  • @tbsalling I only have the data in CSV format (https://doi.org/10.15480/336.4471). The original data source is https://marinecadastre.gov/ais/. – afonsomm Apr 29 '23 at 12:55
  • @afonsomm ah ok. It's just that if you had the original message I could manually decode it for you. Sometimes negative numbers (and other strange) numbers have a special meaning in AIS. – tbsalling May 01 '23 at 06:41

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