Resolve "KDTree cannot handle cases near -180, 180 lon correctly"

Closes #1 (closed)

GeoSpatialTools/kdtree.py

         else:
             return self.child_right.delete(point)
 
-    def query(
+    def query(self, point) -> tuple[Record | None, float]:
+        """Find the nearest Record within the KDTree to a _query Record"""
+        if point.lon < 0:
+            point2 = Record(point.lon + 360, point.lat)
+        else:
+            point2 = Record(point.lon - 360, point.lat)
+
+        r1, d1 = self._query(point)
+        r2, d2 = self._query(point2)
+        if d1 <= d2:
+            r = r1
+        else:
+            r = r2
+        return r, point.distance(r)
+
+    def _query(
         self,
         point: Record,
         current_best: Record | None = None,
         best_distance: float = inf,
     ) -> tuple[Record | None, float]:
-        """Find the nearest Record within the KDTree to a query Record"""
         if not self.split:
             for p in self.points:
                 dist = point.distance(p)
             return current_best, best_distance
 
         if getattr(point, self.variable) < self.partition_value:
-            current_best, best_distance = self.child_left.query(
+            current_best, best_distance = self.child_left._query(
                 point, current_best, best_distance
             )
             if (
                 point.distance(self._get_partition_record(point))
                 < best_distance
             ):
-                current_best, best_distance = self.child_right.query(
+                current_best, best_distance = self.child_right._query(
                     point, current_best, best_distance
                 )
         else:
-            current_best, best_distance = self.child_right.query(
+            current_best, best_distance = self.child_right._query(
                 point, current_best, best_distance
             )
             if (
                 point.distance(self._get_partition_record(point))
                 < best_distance
             ):
-                current_best, best_distance = self.child_left.query(
+                current_best, best_distance = self.child_left._query(
                     point, current_best, best_distance
                 )