Clip command removes Features visually but not from exported file. about mapshaper

[mbloch]

Based on what you've reported, I think I know what is happening, but I won't know for sure if I can't download and test your data file myself.

Your initial filter command takes the boundary of Spain and copies it to a second layer. Your clip command then uses the Spanish boundary layer to clip the first layer. The France country boundary polygon may overlap the Spain boundary just a little bit, so it becomes a tiny sliver polygon after the clip command -- so small that you can't clearly see it, although it shows up in the -inspect command. That's my best guess as to what is happening. If you want to thoroughly remove all of the France features, I suggest that you do that in an initial -filter command, like this: -filter 'tags["ISO3166-1"] == "ES"'.

[NMC92]

Hi. Thank you for the reply. I will prepare the data in a bit for you to test it yourself.
I'm thinking of manually checking the resulting file, handpicking the few "sliver" Features, put them in a geojson file and then upload them to mapshaper. I'm assuming the view will snap to the tiny slivers so I'll finally be able to see them.

[NMC92]

I got what the problem is. https://www.openstreetmap.org/note/2121166
There's an island that is French for half of the year but Spanish for the other half. When I use the clip command it does exactly what it is supposed to do. I hate these complicated cases...

[mbloch]

good sleuthing!