diff --git a/src/ol/base/coveragearea.js b/src/ol/base/coveragearea.js
new file mode 100644
index 0000000000..d925452f48
--- /dev/null
+++ b/src/ol/base/coveragearea.js
@@ -0,0 +1,54 @@
+goog.provide('ol.CoverageArea');
+
+goog.require('ol.Extent');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.Extent}
+ * @param {number} minX Minimum X.
+ * @param {number} minY Minimum Y.
+ * @param {number} maxX Maximum X.
+ * @param {number} maxY Maximum Y.
+ * @param {number} minZ Minimum Z.
+ * @param {number} maxZ Maximum Z.
+ */
+ol.CoverageArea = function(minX, minY, maxX, maxY, minZ, maxZ) {
+
+  goog.base(this, minX, minY, maxX, maxY);
+
+  /**
+   * @type {number}
+   */
+  this.minZ = minZ;
+
+  /**
+   * @type {number}
+   */
+  this.maxZ = maxZ;
+
+};
+goog.inherits(ol.CoverageArea, ol.Extent);
+
+
+/**
+ * @param {ol.Extent} extent Extent.
+ * @param {number} z Z.
+ * @return {boolean} Intersects.
+ */
+ol.CoverageArea.prototype.intersectsWithZ = function(extent, z) {
+  return this.intersects(extent) && this.minZ <= z && z <= this.maxZ;
+};
+
+
+/**
+ * @override
+ * @param {ol.TransformFunction} transformFn Transform.
+ * @return {ol.CoverageArea} Transformed coverage area.
+ */
+ol.CoverageArea.prototype.transform = function(transformFn) {
+  var min = transformFn(new ol.Coordinate(this.minX, this.minY));
+  var max = transformFn(new ol.Coordinate(this.maxX, this.maxY));
+  return new ol.CoverageArea(min.x, min.y, max.x, max.y, this.minZ, this.maxZ);
+};