Is there a PostGIS function to get a tangent and normal line?

[المشرف العام]

I'm looking for a function that will return a tangent (and normal) for a LINESTRING in PostGIS. I think this is the 3rd time I've come across the need for this function and everytime, I end porting whatever I'm working on to c#/ArcObjects in order to use the QueryTangent/QueryNormal method rather than make the effort to research a PostGIS option.

Is there an existing functions in PostGIS (I'm not tied to a specific version)?

And if it doesn't exist, has anyone already written it and wouldn't mind posting it as an answer?



أكثر...