`gis:create-turtles-inside-polygon` fails with `Extension exception: Index 0 out of bounds for length 0` about gis-extension HOT 2 OPEN

Looks like there's something in that dataset that is giving gis:create-turtles-inside-polygon a hard time. The good news for you @EwoutH is that since you want the turtles you are creating to be in the center of the polygon, the old fashioned way of creating turtles from polygons (before I created gis:create-turtles-inside-polygon) still works for you! Try this for your setup-spots function:

to setup-spots
  ;; For each parking space, determine the centroid, convert to x,y coordinates (list with 2 elements),
  ;; and create a turtle in the center of that polygon
  foreach gis:feature-list-of parking-dataset [ this-vector-feature ->
    let center gis:centroid-of this-vector-feature
    let loc gis:location-of center

    if length loc >= 2 [
      create-spots 1 [
        setxy item 0 loc item 1 loc
        set AMENITY gis:property-value this-vector-feature "AMENITY"
      ]
    ]
  ]
end

from gis-extension.

Thanks for getting back! It's a bit less scalable when adding other property-values in the future, but in my case I can get it to work.

I generated my dataset using OpenStreetMap data collected on https://overpass-turbo.eu/, using the query:

[bbox:{{bbox}}];

area
  [amenity=parking];
/*added by auto repair*/
(._;>;);
/*end of auto repair*/

out;

In the case anyone wants to debug this.

from gis-extension.