Add HaversineSpec (not very accurate); fixed ZoomedLayoutSchemeSpec

spark/src/test/scala/geotrellis/spark/tiling/ZoomedLayoutSchemeSpec.scala

@@ -113,7 +113,7 @@ class ZoomedLayoutSchemeSpec extends FunSpec with Matchers {
       val (lat2, lon2) = (-81.572543, -148.009213)
       val scheme = ZoomedLayoutScheme(LatLng, 256)
       val z = scheme.zoom(lon1, lat1, CellSize(lon2 - lon1, lat2 - lat1))
-      z should be (6)
+      z should be (9)
     }
 
     it("should pyramid floating layout") {

util/src/test/scala/geotrellis/util/HaversineSpec.scala

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2016 Azavea
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package geotrellis.util
+
+import org.scalatest._
+
+class HaversineSpec extends FunSpec with Matchers {
+  describe("HaversineSpec") {
+    // Rio de Janeiro
+    val rio = -22.906847 -> -43.172896
+    // São Paulo
+    val sp = -23.550520 -> -46.633309
+
+    it("should calculate distance between") {
+      (Haversine(rio, sp) / 1000).toInt shouldBe 388
+    }
+  }
+}