Use new Meters() function.

Gopkg.lock

@@ -227,7 +227,7 @@
 
 [[projects]]
   branch = "master"
-  digest = "1:6fc1b77dedecd24d417a38c4ffc580c0c4de1540b60453efee44f1a41b205d27"
+  digest = "1:4be7626fb8f801eb85aa7494ce3a504c9b4121a07f4ec19d7d204185bd6397d5"
   name = "github.com/tidwall/geojson"
   packages = [
     ".",
@@ -235,7 +235,7 @@
     "geometry",
   ]
   pruneopts = ""
-  revision = "581e33d25c96a70d4006cbeca5fcd716caad7766"
+  revision = "928ede3da18d831dea0af0bb26adeb025145c23b"
 
 [[projects]]
   digest = "1:3ddca2bd5496c6922a2a9e636530e178a43c2a534ea6634211acdc7d10222794"

internal/controller/search.go

@@ -425,7 +425,7 @@ func (c *Controller) nearestNeighbors(
 			return true
 		}
 		dist := o.Distance(target)
-		if s.obj.(*geojson.Circle).Meters > 0 && dist > s.obj.(*geojson.Circle).Meters {
+		if target.(*geojson.Circle).Meters() > 0 && dist > target.(*geojson.Circle).Meters() {
 			return false
 		}
 		items = append(items, iterItem{id: id, o: o, fields: fields, dist: dist})

vendor/github.com/tidwall/geojson/circle.go

@@ -70,3 +70,11 @@ func (g *Circle) JSON() string {
 func (g *Circle) String() string {
 	return string(g.AppendJSON(nil))
 }
+
+func (g *Circle) Meters() float64 {
+	return g.meters
+}
+
+func (g *Circle) Center() geometry.Point {
+	return g.center
+}