This is my experience too, it has got a bit better but nowhere near as quickly as other domains I deal with. I can usually guide the LLM to a decent solution but there's a lot of hand holding and I'm often left wondering if it wouldn't have been quicker for me to just get stuck in and do it the old fashioned way. Maybe because geospatial stuff is pretty niche so is under-represented in the training data relative to yr standard CRUD apps and React front ends which are ten-a-penny?