diff --git a/src/ol/format/esrijsonformat.js b/src/ol/format/esrijsonformat.js
index aae2124455..340453c6ea 100644
--- a/src/ol/format/esrijsonformat.js
+++ b/src/ol/format/esrijsonformat.js
@@ -32,7 +32,7 @@ goog.require('ol.proj');
  */
 ol.format.EsriJSON = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options ? opt_options : {};
 
   goog.base(this);
 
@@ -80,9 +80,9 @@ ol.format.EsriJSON.readGeometry_ = function(object, opt_options) {
       object.rings = rings;
     }
   }
-  goog.asserts.assert(goog.isDef(type), 'geometry type should be defined');
+  goog.asserts.assert(type, 'geometry type should be defined');
   var geometryReader = ol.format.EsriJSON.GEOMETRY_READERS_[type];
-  goog.asserts.assert(goog.isDef(geometryReader),
+  goog.asserts.assert(geometryReader,
       'geometryReader should be defined');
   return /** @type {ol.geom.Geometry} */ (
       ol.format.Feature.transformWithOptions(
@@ -490,19 +490,19 @@ ol.format.EsriJSON.prototype.readFeatureFromObject = function(
   var geometry = ol.format.EsriJSON.readGeometry_(esriJSONFeature.geometry,
       opt_options);
   var feature = new ol.Feature();
-  if (goog.isDef(this.geometryName_)) {
+  if (this.geometryName_) {
     feature.setGeometryName(this.geometryName_);
   }
   feature.setGeometry(geometry);
-  if (goog.isDef(opt_options) && goog.isDef(opt_options.idField) &&
-      goog.isDef(esriJSONFeature.attributes[opt_options.idField])) {
+  if (opt_options && opt_options.idField &&
+      esriJSONFeature.attributes[opt_options.idField]) {
     goog.asserts.assert(
         goog.isNumber(esriJSONFeature.attributes[opt_options.idField]),
         'objectIdFieldName value should be a number');
     feature.setId(/** @type {number} */(
         esriJSONFeature.attributes[opt_options.idField]));
   }
-  if (goog.isDef(esriJSONFeature.attributes)) {
+  if (esriJSONFeature.attributes) {
     feature.setProperties(esriJSONFeature.attributes);
   }
   return feature;
@@ -515,7 +515,7 @@ ol.format.EsriJSON.prototype.readFeatureFromObject = function(
 ol.format.EsriJSON.prototype.readFeaturesFromObject = function(
     object, opt_options) {
   var esriJSONObject = /** @type {EsriJSONObject} */ (object);
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options ? opt_options : {};
   if (goog.isDefAndNotNull(esriJSONObject.features)) {
     var esriJSONFeatureCollection = /** @type {EsriJSONFeatureCollection} */
         (object);
@@ -591,8 +591,7 @@ ol.format.EsriJSON.prototype.readProjectionFromObject = function(object) {
  */
 ol.format.EsriJSON.writeGeometry_ = function(geometry, opt_options) {
   var geometryWriter = ol.format.EsriJSON.GEOMETRY_WRITERS_[geometry.getType()];
-  goog.asserts.assert(goog.isDef(geometryWriter),
-      'geometryWriter should be defined');
+  goog.asserts.assert(geometryWriter, 'geometryWriter should be defined');
   return geometryWriter(/** @type {ol.geom.Geometry} */ (
       ol.format.Feature.transformWithOptions(geometry, true, opt_options)),
       opt_options);
@@ -662,7 +661,7 @@ ol.format.EsriJSON.prototype.writeFeatureObject = function(
   } else {
     object['attributes'] = {};
   }
-  if (goog.isDef(opt_options) && goog.isDef(opt_options.featureProjection)) {
+  if (opt_options && opt_options.featureProjection) {
     object['spatialReference'] = /** @type {EsriJSONCRS} */({
       wkid: ol.proj.get(
           opt_options.featureProjection).getCode().split(':').pop()
diff --git a/src/ol/format/geojsonformat.js b/src/ol/format/geojsonformat.js
index 6926fc5036..30925927af 100644
--- a/src/ol/format/geojsonformat.js
+++ b/src/ol/format/geojsonformat.js
@@ -31,7 +31,7 @@ goog.require('ol.proj');
  */
 ol.format.GeoJSON = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options ? opt_options : {};
 
   goog.base(this);
 
@@ -73,8 +73,7 @@ ol.format.GeoJSON.readGeometry_ = function(object, opt_options) {
     return null;
   }
   var geometryReader = ol.format.GeoJSON.GEOMETRY_READERS_[object.type];
-  goog.asserts.assert(goog.isDef(geometryReader),
-      'geometryReader should be defined');
+  goog.asserts.assert(geometryReader, 'geometryReader should be defined');
   return /** @type {ol.geom.Geometry} */ (
       ol.format.Feature.transformWithOptions(
           geometryReader(object), false, opt_options));
@@ -183,8 +182,7 @@ ol.format.GeoJSON.readPolygonGeometry_ = function(object) {
  */
 ol.format.GeoJSON.writeGeometry_ = function(geometry, opt_options) {
   var geometryWriter = ol.format.GeoJSON.GEOMETRY_WRITERS_[geometry.getType()];
-  goog.asserts.assert(goog.isDef(geometryWriter),
-      'geometryWriter should be defined');
+  goog.asserts.assert(geometryWriter, 'geometryWriter should be defined');
   return geometryWriter(/** @type {ol.geom.Geometry} */ (
       ol.format.Feature.transformWithOptions(geometry, true, opt_options)),
       opt_options);
@@ -284,7 +282,7 @@ ol.format.GeoJSON.writeMultiPolygonGeometry_ = function(geometry, opt_options) {
   goog.asserts.assertInstanceof(geometry, ol.geom.MultiPolygon,
       'geometry should be an ol.geom.MultiPolygon');
   var right;
-  if (goog.isDef(opt_options)) {
+  if (opt_options) {
     right = opt_options.rightHanded;
   }
   return /** @type {GeoJSONGeometry} */ ({
@@ -320,7 +318,7 @@ ol.format.GeoJSON.writePolygonGeometry_ = function(geometry, opt_options) {
   goog.asserts.assertInstanceof(geometry, ol.geom.Polygon,
       'geometry should be an ol.geom.Polygon');
   var right;
-  if (goog.isDef(opt_options)) {
+  if (opt_options) {
     right = opt_options.rightHanded;
   }
   return /** @type {GeoJSONGeometry} */ ({
@@ -408,14 +406,14 @@ ol.format.GeoJSON.prototype.readFeatureFromObject = function(
   var geometry = ol.format.GeoJSON.readGeometry_(geoJSONFeature.geometry,
       opt_options);
   var feature = new ol.Feature();
-  if (goog.isDef(this.geometryName_)) {
+  if (this.geometryName_) {
     feature.setGeometryName(this.geometryName_);
   }
   feature.setGeometry(geometry);
-  if (goog.isDef(geoJSONFeature.id)) {
+  if (geoJSONFeature.id) {
     feature.setId(geoJSONFeature.id);
   }
-  if (goog.isDef(geoJSONFeature.properties)) {
+  if (geoJSONFeature.properties) {
     feature.setProperties(geoJSONFeature.properties);
   }
   return feature;
diff --git a/src/ol/format/gml/gml3format.js b/src/ol/format/gml/gml3format.js
index 6dcff97b7b..b0fd244e62 100644
--- a/src/ol/format/gml/gml3format.js
+++ b/src/ol/format/gml/gml3format.js
@@ -5,6 +5,7 @@ goog.require('goog.array');
 goog.require('goog.asserts');
 goog.require('goog.dom.NodeType');
 goog.require('goog.object');
+goog.require('ol');
 goog.require('ol.Feature');
 goog.require('ol.extent');
 goog.require('ol.format.Feature');
@@ -37,7 +38,7 @@ goog.require('ol.xml');
  */
 ol.format.GML3 = function(opt_options) {
   var options = /** @type {olx.format.GMLOptions} */
-      (goog.isDef(opt_options) ? opt_options : {});
+      (opt_options ? opt_options : {});
 
   goog.base(this, options);
 
@@ -45,34 +46,34 @@ ol.format.GML3 = function(opt_options) {
    * @private
    * @type {boolean}
    */
-  this.surface_ = goog.isDef(options.surface) ?
-      options.surface : false;
+  this.surface_ = ol.isDef(options.surface) ?
+      /** @type {boolean} */ (options.surface) : false;
 
   /**
    * @private
    * @type {boolean}
    */
-  this.curve_ = goog.isDef(options.curve) ?
-      options.curve : false;
+  this.curve_ = ol.isDef(options.curve) ?
+      /** @type {boolean} */ (options.curve) : false;
 
   /**
    * @private
    * @type {boolean}
    */
-  this.multiCurve_ = goog.isDef(options.multiCurve) ?
-      options.multiCurve : true;
+  this.multiCurve_ = ol.isDef(options.multiCurve) ?
+      /** @type {boolean} */ (options.multiCurve) : true;
 
   /**
    * @private
    * @type {boolean}
    */
-  this.multiSurface_ = goog.isDef(options.multiSurface) ?
-      options.multiSurface : true;
+  this.multiSurface_ = ol.isDef(options.multiSurface) ?
+      /** @type {boolean} */ (options.multiSurface) : true;
 
   /**
    * @inheritDoc
    */
-  this.schemaLocation = goog.isDef(options.schemaLocation) ?
+  this.schemaLocation = options.schemaLocation ?
       options.schemaLocation : ol.format.GML3.schemaLocation_;
 
 };
@@ -103,7 +104,7 @@ ol.format.GML3.prototype.readMultiCurve_ = function(node, objectStack) {
   var lineStrings = ol.xml.pushParseAndPop(
       /** @type {Array.<ol.geom.LineString>} */ ([]),
       this.MULTICURVE_PARSERS_, node, objectStack, this);
-  if (goog.isDef(lineStrings)) {
+  if (lineStrings) {
     var multiLineString = new ol.geom.MultiLineString(null);
     multiLineString.setLineStrings(lineStrings);
     return multiLineString;
@@ -127,7 +128,7 @@ ol.format.GML3.prototype.readMultiSurface_ = function(node, objectStack) {
   var polygons = ol.xml.pushParseAndPop(
       /** @type {Array.<ol.geom.Polygon>} */ ([]),
       this.MULTISURFACE_PARSERS_, node, objectStack, this);
-  if (goog.isDef(polygons)) {
+  if (polygons) {
     var multiPolygon = new ol.geom.MultiPolygon(null);
     multiPolygon.setPolygons(polygons);
     return multiPolygon;
@@ -251,7 +252,7 @@ ol.format.GML3.prototype.interiorParser_ = function(node, objectStack) {
   var flatLinearRing = ol.xml.pushParseAndPop(
       /** @type {Array.<number>|undefined} */ (undefined),
       this.RING_PARSERS, node, objectStack, this);
-  if (goog.isDef(flatLinearRing)) {
+  if (flatLinearRing) {
     var flatLinearRings = /** @type {Array.<Array.<number>>} */
         (objectStack[objectStack.length - 1]);
     goog.asserts.assert(goog.isArray(flatLinearRings),
@@ -276,7 +277,7 @@ ol.format.GML3.prototype.exteriorParser_ = function(node, objectStack) {
   var flatLinearRing = ol.xml.pushParseAndPop(
       /** @type {Array.<number>|undefined} */ (undefined),
       this.RING_PARSERS, node, objectStack, this);
-  if (goog.isDef(flatLinearRing)) {
+  if (flatLinearRing) {
     var flatLinearRings = /** @type {Array.<Array.<number>>} */
         (objectStack[objectStack.length - 1]);
     goog.asserts.assert(goog.isArray(flatLinearRings),
@@ -302,8 +303,7 @@ ol.format.GML3.prototype.readSurface_ = function(node, objectStack) {
   var flatLinearRings = ol.xml.pushParseAndPop(
       /** @type {Array.<Array.<number>>} */ ([null]),
       this.SURFACE_PARSERS_, node, objectStack, this);
-  if (goog.isDef(flatLinearRings) &&
-      !goog.isNull(flatLinearRings[0])) {
+  if (flatLinearRings && !goog.isNull(flatLinearRings[0])) {
     var polygon = new ol.geom.Polygon(null);
     var flatCoordinates = flatLinearRings[0];
     var ends = [flatCoordinates.length];
@@ -334,7 +334,7 @@ ol.format.GML3.prototype.readCurve_ = function(node, objectStack) {
   var flatCoordinates = ol.xml.pushParseAndPop(
       /** @type {Array.<number>} */ ([null]),
       this.CURVE_PARSERS_, node, objectStack, this);
-  if (goog.isDef(flatCoordinates)) {
+  if (flatCoordinates) {
     var lineString = new ol.geom.LineString(null);
     lineString.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
     return lineString;
@@ -741,7 +741,7 @@ ol.format.GML3.prototype.writeEnvelope = function(node, extent, objectStack) {
   var context = objectStack[objectStack.length - 1];
   goog.asserts.assert(goog.isObject(context), 'context should be an Object');
   var srsName = context['srsName'];
-  if (goog.isDef(srsName)) {
+  if (srsName) {
     node.setAttribute('srsName', srsName);
   }
   var keys = ['lowerCorner', 'upperCorner'];
@@ -787,11 +787,11 @@ ol.format.GML3.prototype.RING_NODE_FACTORY_ =
   var parentNode = context.node;
   goog.asserts.assert(goog.isObject(context), 'context should be an Object');
   var exteriorWritten = context['exteriorWritten'];
-  if (!goog.isDef(exteriorWritten)) {
+  if (!ol.isDef(exteriorWritten)) {
     context['exteriorWritten'] = true;
   }
   return ol.xml.createElementNS(parentNode.namespaceURI,
-      goog.isDef(exteriorWritten) ? 'interior' : 'exterior');
+      ol.isDef(exteriorWritten) ? 'interior' : 'exterior');
 };
 
 
@@ -947,7 +947,7 @@ ol.format.GML3.prototype.writeSurfaceOrPolygonMember_ =
   goog.asserts.assert(goog.isObject(context), 'context should be an Object');
   var child = this.GEOMETRY_NODE_FACTORY_(
       polygon, objectStack);
-  if (goog.isDef(child)) {
+  if (child) {
     node.appendChild(child);
     this.writeSurfaceOrPolygon_(child, polygon, objectStack);
   }
@@ -979,7 +979,7 @@ ol.format.GML3.prototype.writeLineStringOrCurveMember_ =
   var context = objectStack[objectStack.length - 1];
   goog.asserts.assert(goog.isObject(context), 'context should be an Object');
   var child = this.GEOMETRY_NODE_FACTORY_(line, objectStack);
-  if (goog.isDef(child)) {
+  if (child) {
     node.appendChild(child);
     this.writeCurveOrLineString_(child, line, objectStack);
   }
@@ -1028,7 +1028,7 @@ ol.format.GML3.prototype.writeGeometryElement =
   item.node = node;
   var value;
   if (goog.isArray(geometry)) {
-    if (goog.isDef(context.dataProjection)) {
+    if (context.dataProjection) {
       value = ol.proj.transformExtent(
           geometry, context.featureProjection, context.dataProjection);
     } else {
@@ -1055,14 +1055,14 @@ ol.format.GML3.prototype.writeGeometryElement =
 ol.format.GML3.prototype.writeFeatureElement =
     function(node, feature, objectStack) {
   var fid = feature.getId();
-  if (goog.isDef(fid)) {
+  if (fid) {
     node.setAttribute('fid', fid);
   }
   var context = objectStack[objectStack.length - 1];
   goog.asserts.assert(goog.isObject(context), 'context should be an Object');
   var featureNS = context['featureNS'];
   var geometryName = feature.getGeometryName();
-  if (!goog.isDef(context.serializers)) {
+  if (!context.serializers) {
     context.serializers = {};
     context.serializers[featureNS] = {};
   }
@@ -1293,7 +1293,7 @@ ol.format.GML3.prototype.writeGeometryNode = function(geometry, opt_options) {
   var context = {node: geom, srsName: this.srsName,
     curve: this.curve_, surface: this.surface_,
     multiSurface: this.multiSurface_, multiCurve: this.multiCurve_};
-  if (goog.isDef(opt_options)) {
+  if (opt_options) {
     goog.object.extend(context, opt_options);
   }
   this.writeGeometryElement(geom, geometry, [context]);
@@ -1336,7 +1336,7 @@ ol.format.GML3.prototype.writeFeaturesNode = function(features, opt_options) {
     featureNS: this.featureNS,
     featureType: this.featureType
   };
-  if (goog.isDef(opt_options)) {
+  if (opt_options) {
     goog.object.extend(context, opt_options);
   }
   this.writeFeatureMembers_(node, features, [context]);
diff --git a/src/ol/format/gpxformat.js b/src/ol/format/gpxformat.js
index fabb0f6b72..2da803bf43 100644
--- a/src/ol/format/gpxformat.js
+++ b/src/ol/format/gpxformat.js
@@ -27,7 +27,7 @@ goog.require('ol.xml');
  */
 ol.format.GPX = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options ? opt_options : {};
 
   goog.base(this);
 
@@ -130,7 +130,7 @@ ol.format.GPX.parseRtePt_ = function(node, objectStack) {
   goog.asserts.assert(node.localName == 'rtept', 'localName should be rtept');
   var values = ol.xml.pushParseAndPop(
       {}, ol.format.GPX.RTEPT_PARSERS_, node, objectStack);
-  if (goog.isDef(values)) {
+  if (values) {
     var rteValues = /** @type {Object} */ (objectStack[objectStack.length - 1]);
     var flatCoordinates = /** @type {Array.<number>} */
         (rteValues['flatCoordinates']);
@@ -150,7 +150,7 @@ ol.format.GPX.parseTrkPt_ = function(node, objectStack) {
   goog.asserts.assert(node.localName == 'trkpt', 'localName should be trkpt');
   var values = ol.xml.pushParseAndPop(
       {}, ol.format.GPX.TRKPT_PARSERS_, node, objectStack);
-  if (goog.isDef(values)) {
+  if (values) {
     var trkValues = /** @type {Object} */ (objectStack[objectStack.length - 1]);
     var flatCoordinates = /** @type {Array.<number>} */
         (trkValues['flatCoordinates']);
@@ -192,7 +192,7 @@ ol.format.GPX.readRte_ = function(node, objectStack) {
   var values = ol.xml.pushParseAndPop({
     'flatCoordinates': []
   }, ol.format.GPX.RTE_PARSERS_, node, objectStack);
-  if (!goog.isDef(values)) {
+  if (!values) {
     return undefined;
   }
   var flatCoordinates = /** @type {Array.<number>} */
@@ -222,7 +222,7 @@ ol.format.GPX.readTrk_ = function(node, objectStack) {
     'flatCoordinates': [],
     'ends': []
   }, ol.format.GPX.TRK_PARSERS_, node, objectStack);
-  if (!goog.isDef(values)) {
+  if (!values) {
     return undefined;
   }
   var flatCoordinates = /** @type {Array.<number>} */
@@ -253,7 +253,7 @@ ol.format.GPX.readWpt_ = function(node, objectStack) {
   var options = /** @type {olx.format.ReadOptions} */ (objectStack[0]);
   var values = ol.xml.pushParseAndPop(
       {}, ol.format.GPX.WPT_PARSERS_, node, objectStack);
-  if (!goog.isDef(values)) {
+  if (!values) {
     return undefined;
   }
   var coordinates = ol.format.GPX.appendCoordinate_([], node, values);
@@ -422,7 +422,7 @@ ol.format.GPX.prototype.handleReadExtensions_ = function(features) {
   }
   for (var i = 0, ii = features.length; i < ii; ++i) {
     var feature = features[i];
-    if (goog.isDef(this.readExtensions_)) {
+    if (this.readExtensions_) {
       var extensionsNode = feature.get('extensionsNode_') || null;
       this.readExtensions_(feature, extensionsNode);
     }
@@ -453,11 +453,11 @@ ol.format.GPX.prototype.readFeatureFromNode = function(node, opt_options) {
     return null;
   }
   var featureReader = ol.format.GPX.FEATURE_READER_[node.localName];
-  if (!goog.isDef(featureReader)) {
+  if (!featureReader) {
     return null;
   }
   var feature = featureReader(node, [this.getReadOptions(node, opt_options)]);
-  if (!goog.isDef(feature)) {
+  if (!feature) {
     return null;
   }
   this.handleReadExtensions_([feature]);
@@ -490,7 +490,7 @@ ol.format.GPX.prototype.readFeaturesFromNode = function(node, opt_options) {
     var features = ol.xml.pushParseAndPop(
         /** @type {Array.<ol.Feature>} */ ([]), ol.format.GPX.GPX_PARSERS_,
         node, [this.getReadOptions(node, opt_options)]);
-    if (goog.isDef(features)) {
+    if (features) {
       this.handleReadExtensions_(features);
       return features;
     } else {
@@ -588,7 +588,7 @@ ol.format.GPX.writeRte_ = function(node, feature, objectStack) {
   var properties = feature.getProperties();
   var context = {node: node, 'properties': properties};
   var geometry = feature.getGeometry();
-  if (goog.isDef(geometry)) {
+  if (geometry) {
     goog.asserts.assertInstanceof(geometry, ol.geom.LineString,
         'geometry should be an ol.geom.LineString');
     geometry = /** @type {ol.geom.LineString} */
@@ -616,7 +616,7 @@ ol.format.GPX.writeTrk_ = function(node, feature, objectStack) {
   var properties = feature.getProperties();
   var context = {node: node, 'properties': properties};
   var geometry = feature.getGeometry();
-  if (goog.isDef(geometry)) {
+  if (geometry) {
     goog.asserts.assertInstanceof(geometry, ol.geom.MultiLineString,
         'geometry should be an ol.geom.MultiLineString');
     geometry = /** @type {ol.geom.MultiLineString} */
@@ -659,7 +659,7 @@ ol.format.GPX.writeWpt_ = function(node, feature, objectStack) {
   goog.asserts.assert(goog.isObject(context), 'context should be an Object');
   context['properties'] = feature.getProperties();
   var geometry = feature.getGeometry();
-  if (goog.isDef(geometry)) {
+  if (geometry) {
     goog.asserts.assertInstanceof(geometry, ol.geom.Point,
         'geometry should be an ol.geom.Point');
     geometry = /** @type {ol.geom.Point} */
@@ -838,7 +838,7 @@ ol.format.GPX.GPX_NODE_FACTORY_ = function(value, objectStack, opt_nodeName) {
   goog.asserts.assertInstanceof(value, ol.Feature,
       'value should be an ol.Feature');
   var geometry = value.getGeometry();
-  if (goog.isDef(geometry)) {
+  if (geometry) {
     var parentNode = objectStack[objectStack.length - 1].node;
     goog.asserts.assert(ol.xml.isNode(parentNode),
         'parentNode should be an XML node');
diff --git a/src/ol/format/igcformat.js b/src/ol/format/igcformat.js
index 08fd284084..8a2f7a0bb4 100644
--- a/src/ol/format/igcformat.js
+++ b/src/ol/format/igcformat.js
@@ -36,7 +36,7 @@ ol.format.IGCZ = {
  */
 ol.format.IGC = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options ? opt_options : {};
 
   goog.base(this);
 
@@ -49,7 +49,7 @@ ol.format.IGC = function(opt_options) {
    * @private
    * @type {ol.format.IGCZ}
    */
-  this.altitudeMode_ = goog.isDef(options.altitudeMode) ?
+  this.altitudeMode_ = options.altitudeMode ?
       options.altitudeMode : ol.format.IGCZ.NONE;
 
 };
diff --git a/src/ol/format/jsonfeatureformat.js b/src/ol/format/jsonfeatureformat.js
index 0ef66bc725..5016f02d3d 100644
--- a/src/ol/format/jsonfeatureformat.js
+++ b/src/ol/format/jsonfeatureformat.js
@@ -32,7 +32,7 @@ ol.format.JSONFeature.prototype.getObject_ = function(source) {
     return source;
   } else if (goog.isString(source)) {
     var object = goog.json.parse(source);
-    return goog.isDef(object) ? object : null;
+    return object ? object : null;
   } else {
     goog.asserts.fail();
     return null;
diff --git a/src/ol/format/kmlformat.js b/src/ol/format/kmlformat.js
index e718ff199a..9371fb20d2 100644
--- a/src/ol/format/kmlformat.js
+++ b/src/ol/format/kmlformat.js
@@ -13,6 +13,7 @@ goog.require('goog.dom.NodeType');
 goog.require('goog.math');
 goog.require('goog.object');
 goog.require('goog.string');
+goog.require('ol');
 goog.require('ol.Feature');
 goog.require('ol.FeatureStyleFunction');
 goog.require('ol.color');
@@ -68,7 +69,7 @@ ol.format.KMLGxTrackObject_;
  */
 ol.format.KML = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options ? opt_options : {};
 
   goog.base(this);
 
@@ -81,15 +82,15 @@ ol.format.KML = function(opt_options) {
    * @private
    * @type {Array.<ol.style.Style>}
    */
-  this.defaultStyle_ = goog.isDef(options.defaultStyle) ?
+  this.defaultStyle_ = options.defaultStyle ?
       options.defaultStyle : ol.format.KML.DEFAULT_STYLE_ARRAY_;
 
   /**
    * @private
    * @type {boolean}
    */
-  this.extractStyles_ = goog.isDef(options.extractStyles) ?
-      options.extractStyles : true;
+  this.extractStyles_ = ol.isDef(options.extractStyles) ?
+      /** @type {boolean} */ (options.extractStyles) : true;
 
   /**
    * @private
@@ -296,10 +297,10 @@ ol.format.KML.createFeatureStyleFunction_ = function(
        * @this {ol.Feature}
        */
       function(resolution) {
-        if (goog.isDef(style)) {
+        if (style) {
           return style;
         }
-        if (goog.isDef(styleUrl)) {
+        if (styleUrl) {
           return ol.format.KML.findStyle_(styleUrl, defaultStyle, sharedStyles);
         }
         return defaultStyle;
@@ -440,7 +441,7 @@ ol.format.KML.readVec2_ = function(node) {
  */
 ol.format.KML.readScale_ = function(node) {
   var number = ol.format.XSD.readDecimal(node);
-  if (goog.isDef(number)) {
+  if (ol.isDef(number)) {
     return Math.sqrt(number);
   } else {
     return undefined;
@@ -479,7 +480,7 @@ ol.format.KML.IconStyleParser_ = function(node, objectStack) {
   // FIXME httpQuery
   var object = ol.xml.pushParseAndPop(
       {}, ol.format.KML.ICON_STYLE_PARSERS_, node, objectStack);
-  if (!goog.isDef(object)) {
+  if (!object) {
     return;
   }
   var styleObject = /** @type {Object} */ (objectStack[objectStack.length - 1]);
@@ -489,7 +490,7 @@ ol.format.KML.IconStyleParser_ = function(node, objectStack) {
   var src;
   var href = /** @type {string|undefined} */
       (IconObject['href']);
-  if (goog.isDef(href)) {
+  if (href) {
     src = href;
   } else {
     src = ol.format.KML.DEFAULT_IMAGE_STYLE_SRC_;
@@ -497,7 +498,7 @@ ol.format.KML.IconStyleParser_ = function(node, objectStack) {
   var anchor, anchorXUnits, anchorYUnits;
   var hotSpot = /** @type {ol.format.KMLVec2_|undefined} */
       (object['hotSpot']);
-  if (goog.isDef(hotSpot)) {
+  if (hotSpot) {
     anchor = [hotSpot.x, hotSpot.y];
     anchorXUnits = hotSpot.xunits;
     anchorYUnits = hotSpot.yunits;
@@ -516,7 +517,7 @@ ol.format.KML.IconStyleParser_ = function(node, objectStack) {
       (IconObject['x']);
   var y = /** @type {number|undefined} */
       (IconObject['y']);
-  if (goog.isDef(x) && goog.isDef(y)) {
+  if (ol.isDef(x) && ol.isDef(y)) {
     offset = [x, y];
   }
 
@@ -525,14 +526,14 @@ ol.format.KML.IconStyleParser_ = function(node, objectStack) {
       (IconObject['w']);
   var h = /** @type {number|undefined} */
       (IconObject['h']);
-  if (goog.isDef(w) && goog.isDef(h)) {
+  if (ol.isDef(w) && ol.isDef(h)) {
     size = [w, h];
   }
 
   var rotation;
-  var heading = /** @type {number|undefined} */
+  var heading = /** @type {number} */
       (object['heading']);
-  if (goog.isDef(heading)) {
+  if (ol.isDef(heading)) {
     rotation = goog.math.toRadians(heading);
   }
 
@@ -572,7 +573,7 @@ ol.format.KML.LabelStyleParser_ = function(node, objectStack) {
   // FIXME colorMode
   var object = ol.xml.pushParseAndPop(
       {}, ol.format.KML.LABEL_STYLE_PARSERS_, node, objectStack);
-  if (!goog.isDef(object)) {
+  if (!object) {
     return;
   }
   var styleObject = objectStack[objectStack.length - 1];
@@ -607,7 +608,7 @@ ol.format.KML.LineStyleParser_ = function(node, objectStack) {
   // FIXME gx:labelVisibility
   var object = ol.xml.pushParseAndPop(
       {}, ol.format.KML.LINE_STYLE_PARSERS_, node, objectStack);
-  if (!goog.isDef(object)) {
+  if (!object) {
     return;
   }
   var styleObject = objectStack[objectStack.length - 1];
@@ -635,7 +636,7 @@ ol.format.KML.PolyStyleParser_ = function(node, objectStack) {
   // FIXME colorMode
   var object = ol.xml.pushParseAndPop(
       {}, ol.format.KML.POLY_STYLE_PARSERS_, node, objectStack);
-  if (!goog.isDef(object)) {
+  if (!object) {
     return;
   }
   var styleObject = objectStack[objectStack.length - 1];
@@ -647,12 +648,12 @@ ol.format.KML.PolyStyleParser_ = function(node, objectStack) {
   });
   styleObject['fillStyle'] = fillStyle;
   var fill = /** @type {boolean|undefined} */ (object['fill']);
-  if (goog.isDef(fill)) {
+  if (ol.isDef(fill)) {
     styleObject['fill'] = fill;
   }
   var outline =
       /** @type {boolean|undefined} */ (object['outline']);
-  if (goog.isDef(outline)) {
+  if (ol.isDef(outline)) {
     styleObject['outline'] = outline;
   }
 };
@@ -723,7 +724,7 @@ ol.format.KML.readGxMultiTrack_ = function(node, objectStack) {
   var lineStrings = ol.xml.pushParseAndPop(
       /** @type {Array.<ol.geom.LineString>} */ ([]),
       ol.format.KML.GX_MULTITRACK_GEOMETRY_PARSERS_, node, objectStack);
-  if (!goog.isDef(lineStrings)) {
+  if (!lineStrings) {
     return undefined;
   }
   var multiLineString = new ol.geom.MultiLineString(null);
@@ -750,7 +751,7 @@ ol.format.KML.readGxTrack_ = function(node, objectStack) {
         flatCoordinates: [],
         whens: []
       }), ol.format.KML.GX_TRACK_PARSERS_, node, objectStack);
-  if (!goog.isDef(gxTrackObject)) {
+  if (!gxTrackObject) {
     return undefined;
   }
   var flatCoordinates = gxTrackObject.flatCoordinates;
@@ -781,7 +782,7 @@ ol.format.KML.readIcon_ = function(node, objectStack) {
   goog.asserts.assert(node.localName == 'Icon', 'localName should be Icon');
   var iconObject = ol.xml.pushParseAndPop(
       {}, ol.format.KML.ICON_PARSERS_, node, objectStack);
-  if (goog.isDef(iconObject)) {
+  if (iconObject) {
     return iconObject;
   } else {
     return null;
@@ -819,7 +820,7 @@ ol.format.KML.readLineString_ = function(node, objectStack) {
       objectStack);
   var flatCoordinates =
       ol.format.KML.readFlatCoordinatesFromNode_(node, objectStack);
-  if (goog.isDef(flatCoordinates)) {
+  if (flatCoordinates) {
     var lineString = new ol.geom.LineString(null);
     lineString.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
     lineString.setProperties(properties);
@@ -846,7 +847,7 @@ ol.format.KML.readLinearRing_ = function(node, objectStack) {
       objectStack);
   var flatCoordinates =
       ol.format.KML.readFlatCoordinatesFromNode_(node, objectStack);
-  if (goog.isDef(flatCoordinates)) {
+  if (flatCoordinates) {
     var polygon = new ol.geom.Polygon(null);
     polygon.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates,
         [flatCoordinates.length]);
@@ -872,7 +873,7 @@ ol.format.KML.readMultiGeometry_ = function(node, objectStack) {
   var geometries = ol.xml.pushParseAndPop(
       /** @type {Array.<ol.geom.Geometry>} */ ([]),
       ol.format.KML.MULTI_GEOMETRY_PARSERS_, node, objectStack);
-  if (!goog.isDef(geometries)) {
+  if (!geometries) {
     return null;
   }
   if (geometries.length === 0) {
@@ -1010,14 +1011,14 @@ ol.format.KML.readStyle_ = function(node, objectStack) {
   goog.asserts.assert(node.localName == 'Style', 'localName should be Style');
   var styleObject = ol.xml.pushParseAndPop(
       {}, ol.format.KML.STYLE_PARSERS_, node, objectStack);
-  if (!goog.isDef(styleObject)) {
+  if (!styleObject) {
     return null;
   }
   var fillStyle = /** @type {ol.style.Fill} */ (goog.object.get(
       styleObject, 'fillStyle', ol.format.KML.DEFAULT_FILL_STYLE_));
   var fill = /** @type {boolean|undefined} */
       (styleObject['fill']);
-  if (goog.isDef(fill) && !fill) {
+  if (ol.isDef(fill) && !fill) {
     fillStyle = null;
   }
   var imageStyle = /** @type {ol.style.Image} */ (goog.object.get(
@@ -1028,7 +1029,7 @@ ol.format.KML.readStyle_ = function(node, objectStack) {
       styleObject, 'strokeStyle', ol.format.KML.DEFAULT_STROKE_STYLE_));
   var outline = /** @type {boolean|undefined} */
       (styleObject['outline']);
-  if (goog.isDef(outline) && !outline) {
+  if (ol.isDef(outline) && !outline) {
     strokeStyle = null;
   }
   return [new ol.style.Style({
@@ -1060,8 +1061,8 @@ ol.format.KML.setCommonGeometryProperties_ = function(multiGeometry,
     geometry = geometries[i];
     extrudes[i] = geometry.get('extrude');
     altitudeModes[i] = geometry.get('altitudeMode');
-    hasExtrude = hasExtrude || goog.isDef(extrudes[i]);
-    hasAltitudeMode = hasAltitudeMode || goog.isDef(altitudeModes[i]);
+    hasExtrude = hasExtrude || ol.isDef(extrudes[i]);
+    hasAltitudeMode = hasAltitudeMode || altitudeModes[i];
   }
   if (hasExtrude) {
     multiGeometry.set('extrude', extrudes);
@@ -1085,7 +1086,7 @@ ol.format.KML.DataParser_ = function(node, objectStack) {
   if (!goog.isNull(name)) {
     var data = ol.xml.pushParseAndPop(
         undefined, ol.format.KML.DATA_PARSERS_, node, objectStack);
-    if (goog.isDef(data)) {
+    if (data) {
       var featureObject =
           /** @type {Object} */ (objectStack[objectStack.length - 1]);
       goog.asserts.assert(goog.isObject(featureObject),
@@ -1121,20 +1122,20 @@ ol.format.KML.PairDataParser_ = function(node, objectStack) {
   goog.asserts.assert(node.localName == 'Pair', 'localName should be Pair');
   var pairObject = ol.xml.pushParseAndPop(
       {}, ol.format.KML.PAIR_PARSERS_, node, objectStack);
-  if (!goog.isDef(pairObject)) {
+  if (!pairObject) {
     return;
   }
   var key = /** @type {string|undefined} */
       (pairObject['key']);
-  if (goog.isDef(key) && key == 'normal') {
+  if (key && key == 'normal') {
     var styleUrl = /** @type {string|undefined} */
         (pairObject['styleUrl']);
-    if (goog.isDef(styleUrl)) {
+    if (styleUrl) {
       objectStack[objectStack.length - 1] = styleUrl;
     }
     var Style = /** @type {ol.style.Style} */
         (pairObject['Style']);
-    if (goog.isDef(Style)) {
+    if (Style) {
       objectStack[objectStack.length - 1] = Style;
     }
   }
@@ -1152,7 +1153,7 @@ ol.format.KML.PlacemarkStyleMapParser_ = function(node, objectStack) {
   goog.asserts.assert(node.localName == 'StyleMap',
       'localName should be StyleMap');
   var styleMapValue = ol.format.KML.readStyleMapValue_(node, objectStack);
-  if (!goog.isDef(styleMapValue)) {
+  if (!styleMapValue) {
     return;
   }
   var placemarkObject = objectStack[objectStack.length - 1];
@@ -1215,7 +1216,7 @@ ol.format.KML.innerBoundaryIsParser_ = function(node, objectStack) {
   var flatLinearRing = ol.xml.pushParseAndPop(
       /** @type {Array.<number>|undefined} */ (undefined),
       ol.format.KML.INNER_BOUNDARY_IS_PARSERS_, node, objectStack);
-  if (goog.isDef(flatLinearRing)) {
+  if (flatLinearRing) {
     var flatLinearRings = /** @type {Array.<Array.<number>>} */
         (objectStack[objectStack.length - 1]);
     goog.asserts.assert(goog.isArray(flatLinearRings),
@@ -1240,7 +1241,7 @@ ol.format.KML.outerBoundaryIsParser_ = function(node, objectStack) {
   var flatLinearRing = ol.xml.pushParseAndPop(
       /** @type {Array.<number>|undefined} */ (undefined),
       ol.format.KML.OUTER_BOUNDARY_IS_PARSERS_, node, objectStack);
-  if (goog.isDef(flatLinearRing)) {
+  if (flatLinearRing) {
     var flatLinearRings = /** @type {Array.<Array.<number>>} */
         (objectStack[objectStack.length - 1]);
     goog.asserts.assert(goog.isArray(flatLinearRings),
@@ -1285,16 +1286,16 @@ ol.format.KML.whenParser_ = function(node, objectStack) {
   var m = re.exec(s);
   if (m) {
     var year = parseInt(m[1], 10);
-    var month = goog.isDef(m[3]) ? parseInt(m[3], 10) - 1 : 0;
-    var day = goog.isDef(m[5]) ? parseInt(m[5], 10) : 1;
-    var hour = goog.isDef(m[7]) ? parseInt(m[7], 10) : 0;
-    var minute = goog.isDef(m[8]) ? parseInt(m[8], 10) : 0;
-    var second = goog.isDef(m[9]) ? parseInt(m[9], 10) : 0;
+    var month = m[3] ? parseInt(m[3], 10) - 1 : 0;
+    var day = m[5] ? parseInt(m[5], 10) : 1;
+    var hour = m[7] ? parseInt(m[7], 10) : 0;
+    var minute = m[8] ? parseInt(m[8], 10) : 0;
+    var second = m[9] ? parseInt(m[9], 10) : 0;
     var when = Date.UTC(year, month, day, hour, minute, second);
-    if (goog.isDef(m[10]) && m[10] != 'Z') {
+    if (m[10] && m[10] != 'Z') {
       var sign = m[11] == '-' ? -1 : 1;
       when += sign * 60 * parseInt(m[12], 10);
-      if (goog.isDef(m[13])) {
+      if (m[13]) {
         when += sign * 60 * 60 * parseInt(m[13], 10);
       }
     }
@@ -1650,7 +1651,7 @@ ol.format.KML.prototype.readDocumentOrFolder_ = function(node, objectStack) {
       });
   var features = ol.xml.pushParseAndPop(/** @type {Array.<ol.Feature>} */ ([]),
       parsersNS, node, objectStack, this);
-  if (goog.isDef(features)) {
+  if (features) {
     return features;
   } else {
     return undefined;
@@ -1671,7 +1672,7 @@ ol.format.KML.prototype.readPlacemark_ = function(node, objectStack) {
       'localName should be Placemark');
   var object = ol.xml.pushParseAndPop({'geometry': null},
       ol.format.KML.PLACEMARK_PARSERS_, node, objectStack);
-  if (!goog.isDef(object)) {
+  if (!object) {
     return undefined;
   }
   var feature = new ol.Feature();
@@ -1717,7 +1718,7 @@ ol.format.KML.prototype.readSharedStyle_ = function(node, objectStack) {
   var id = node.getAttribute('id');
   if (!goog.isNull(id)) {
     var style = ol.format.KML.readStyle_(node, objectStack);
-    if (goog.isDef(style)) {
+    if (style) {
       var styleUri;
       if (goog.isDefAndNotNull(node.baseURI)) {
         styleUri = goog.Uri.resolve(node.baseURI, '#' + id).toString();
@@ -1745,7 +1746,7 @@ ol.format.KML.prototype.readSharedStyleMap_ = function(node, objectStack) {
     return;
   }
   var styleMapValue = ol.format.KML.readStyleMapValue_(node, objectStack);
-  if (!goog.isDef(styleMapValue)) {
+  if (!styleMapValue) {
     return;
   }
   var styleUri;
@@ -1783,7 +1784,7 @@ ol.format.KML.prototype.readFeatureFromNode = function(node, opt_options) {
       'localName should be Placemark');
   var feature = this.readPlacemark_(
       node, [this.getReadOptions(node, opt_options)]);
-  if (goog.isDef(feature)) {
+  if (feature) {
     return feature;
   } else {
     return null;
@@ -1817,7 +1818,7 @@ ol.format.KML.prototype.readFeaturesFromNode = function(node, opt_options) {
   if (localName == 'Document' || localName == 'Folder') {
     features = this.readDocumentOrFolder_(
         node, [this.getReadOptions(node, opt_options)]);
-    if (goog.isDef(features)) {
+    if (features) {
       return features;
     } else {
       return [];
@@ -1825,7 +1826,7 @@ ol.format.KML.prototype.readFeaturesFromNode = function(node, opt_options) {
   } else if (localName == 'Placemark') {
     var feature = this.readPlacemark_(
         node, [this.getReadOptions(node, opt_options)]);
-    if (goog.isDef(feature)) {
+    if (feature) {
       return [feature];
     } else {
       return [];
@@ -1836,7 +1837,7 @@ ol.format.KML.prototype.readFeaturesFromNode = function(node, opt_options) {
     for (n = node.firstElementChild; !goog.isNull(n);
          n = n.nextElementSibling) {
       var fs = this.readFeaturesFromNode(n, opt_options);
-      if (goog.isDef(fs)) {
+      if (fs) {
         goog.array.extend(features, fs);
       }
     }
@@ -1878,7 +1879,7 @@ ol.format.KML.prototype.readNameFromDocument = function(doc) {
   for (n = doc.firstChild; !goog.isNull(n); n = n.nextSibling) {
     if (n.nodeType == goog.dom.NodeType.ELEMENT) {
       var name = this.readNameFromNode(n);
-      if (goog.isDef(name)) {
+      if (name) {
         return name;
       }
     }
@@ -1907,7 +1908,7 @@ ol.format.KML.prototype.readNameFromNode = function(node) {
          localName == 'Placemark' ||
          localName == 'kml')) {
       var name = this.readNameFromNode(n);
-      if (goog.isDef(name)) {
+      if (name) {
         return name;
       }
     }
@@ -2165,7 +2166,7 @@ ol.format.KML.writeLabelStyle_ = function(node, style, objectStack) {
     properties['color'] = fill.getColor();
   }
   var scale = style.getScale();
-  if (goog.isDef(scale) && scale !== 1) {
+  if (scale && scale !== 1) {
     properties['scale'] = scale;
   }
   var parentNode = objectStack[objectStack.length - 1].node;
@@ -2272,7 +2273,7 @@ ol.format.KML.writePlacemark_ = function(node, feature, objectStack) {
   // serialize properties (properties unknown to KML are not serialized)
   var properties = feature.getProperties();
   var styleFunction = feature.getStyleFunction();
-  if (goog.isDef(styleFunction)) {
+  if (styleFunction) {
     // FIXME the styles returned by the style function are supposed to be
     // resolution-independent here
     var styles = styleFunction.call(feature, 0);
diff --git a/src/ol/format/osmxmlformat.js b/src/ol/format/osmxmlformat.js
index d6cb8733b4..f45ca8211d 100644
--- a/src/ol/format/osmxmlformat.js
+++ b/src/ol/format/osmxmlformat.js
@@ -223,7 +223,7 @@ ol.format.OSMXML.prototype.readFeaturesFromNode = function(node, opt_options) {
       nodes: {},
       features: []
     }, ol.format.OSMXML.PARSERS_, node, [options]);
-    if (goog.isDef(state.features)) {
+    if (state.features) {
       return state.features;
     }
   }
diff --git a/src/ol/format/owsformat.js b/src/ol/format/owsformat.js
index 30090069a9..1ebd2df650 100644
--- a/src/ol/format/owsformat.js
+++ b/src/ol/format/owsformat.js
@@ -44,7 +44,7 @@ ol.format.OWS.prototype.readFromNode = function(node) {
       'node.nodeType should be ELEMENT');
   var owsObject = ol.xml.pushParseAndPop({},
       ol.format.OWS.PARSERS_, node, []);
-  return goog.isDef(owsObject) ? owsObject : null;
+  return owsObject ? owsObject : null;
 };
 
 
@@ -92,7 +92,7 @@ ol.format.OWS.readConstraint_ = function(node, objectStack) {
   goog.asserts.assert(node.localName == 'Constraint',
       'localName should be Constraint');
   var name = node.getAttribute('name');
-  if (!goog.isDef(name)) {
+  if (!name) {
     return undefined;
   }
   return ol.xml.pushParseAndPop({'name': name},
@@ -143,7 +143,7 @@ ol.format.OWS.readGet_ = function(node, objectStack) {
       'node.nodeType should be ELEMENT');
   goog.asserts.assert(node.localName == 'Get', 'localName should be Get');
   var href = ol.format.XLink.readHref(node);
-  if (!goog.isDef(href)) {
+  if (!href) {
     return undefined;
   }
   return ol.xml.pushParseAndPop({'href': href},
@@ -180,7 +180,7 @@ ol.format.OWS.readOperation_ = function(node, objectStack) {
   var name = node.getAttribute('name');
   var value = ol.xml.pushParseAndPop({},
       ol.format.OWS.OPERATION_PARSERS_, node, objectStack);
-  if (!goog.isDef(value)) {
+  if (!value) {
     return undefined;
   }
   var object = /** @type {Object} */
diff --git a/src/ol/format/polylineformat.js b/src/ol/format/polylineformat.js
index a8d369d1f6..8bba501ee9 100644
--- a/src/ol/format/polylineformat.js
+++ b/src/ol/format/polylineformat.js
@@ -26,7 +26,7 @@ goog.require('ol.proj');
  */
 ol.format.Polyline = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options ? opt_options : {};
 
   goog.base(this);
 
@@ -39,13 +39,13 @@ ol.format.Polyline = function(opt_options) {
    * @private
    * @type {number}
    */
-  this.factor_ = goog.isDef(options.factor) ? options.factor : 1e5;
+  this.factor_ = options.factor ? options.factor : 1e5;
 
   /**
    * @private
    * @type {ol.geom.GeometryLayout}
    */
-  this.geometryLayout_ = goog.isDef(options.geometryLayout) ?
+  this.geometryLayout_ = options.geometryLayout ?
       options.geometryLayout : ol.geom.GeometryLayout.XY;
 };
 goog.inherits(ol.format.Polyline, ol.format.TextFeature);
@@ -65,7 +65,7 @@ goog.inherits(ol.format.Polyline, ol.format.TextFeature);
  * @api
  */
 ol.format.Polyline.encodeDeltas = function(numbers, stride, opt_factor) {
-  var factor = goog.isDef(opt_factor) ? opt_factor : 1e5;
+  var factor = opt_factor ? opt_factor : 1e5;
   var d;
 
   var lastNumbers = new Array(stride);
@@ -100,7 +100,7 @@ ol.format.Polyline.encodeDeltas = function(numbers, stride, opt_factor) {
  * @api
  */
 ol.format.Polyline.decodeDeltas = function(encoded, stride, opt_factor) {
-  var factor = goog.isDef(opt_factor) ? opt_factor : 1e5;
+  var factor = opt_factor ? opt_factor : 1e5;
   var d;
 
   /** @type {Array.<number>} */
@@ -137,7 +137,7 @@ ol.format.Polyline.decodeDeltas = function(encoded, stride, opt_factor) {
  * @api
  */
 ol.format.Polyline.encodeFloats = function(numbers, opt_factor) {
-  var factor = goog.isDef(opt_factor) ? opt_factor : 1e5;
+  var factor = opt_factor ? opt_factor : 1e5;
   var i, ii;
   for (i = 0, ii = numbers.length; i < ii; ++i) {
     numbers[i] = Math.round(numbers[i] * factor);
@@ -157,7 +157,7 @@ ol.format.Polyline.encodeFloats = function(numbers, opt_factor) {
  * @api
  */
 ol.format.Polyline.decodeFloats = function(encoded, opt_factor) {
-  var factor = goog.isDef(opt_factor) ? opt_factor : 1e5;
+  var factor = opt_factor ? opt_factor : 1e5;
   var numbers = ol.format.Polyline.decodeSignedIntegers(encoded);
   var i, ii;
   for (i = 0, ii = numbers.length; i < ii; ++i) {
diff --git a/src/ol/format/topojsonformat.js b/src/ol/format/topojsonformat.js
index cf85306a49..d8a30b34e5 100644
--- a/src/ol/format/topojsonformat.js
+++ b/src/ol/format/topojsonformat.js
@@ -26,7 +26,7 @@ goog.require('ol.proj');
  */
 ol.format.TopoJSON = function(opt_options) {
 
-  var options = goog.isDef(opt_options) ? opt_options : {};
+  var options = opt_options ? opt_options : {};
 
   goog.base(this);
 
@@ -251,8 +251,7 @@ ol.format.TopoJSON.readFeatureFromGeometry_ = function(object, arcs,
   var geometry;
   var type = object.type;
   var geometryReader = ol.format.TopoJSON.GEOMETRY_READERS_[type];
-  goog.asserts.assert(goog.isDef(geometryReader),
-      'geometryReader should be defined');
+  goog.asserts.assert(geometryReader, 'geometryReader should be defined');
   if ((type === 'Point') || (type === 'MultiPoint')) {
     geometry = geometryReader(object, scale, translate);
   } else {
@@ -261,10 +260,10 @@ ol.format.TopoJSON.readFeatureFromGeometry_ = function(object, arcs,
   var feature = new ol.Feature();
   feature.setGeometry(/** @type {ol.geom.Geometry} */ (
       ol.format.Feature.transformWithOptions(geometry, false, opt_options)));
-  if (goog.isDef(object.id)) {
+  if (object.id) {
     feature.setId(object.id);
   }
-  if (goog.isDef(object.properties)) {
+  if (object.properties) {
     feature.setProperties(object.properties);
   }
   return feature;
@@ -290,13 +289,13 @@ ol.format.TopoJSON.prototype.readFeaturesFromObject = function(
   if (object.type == 'Topology') {
     var topoJSONTopology = /** @type {TopoJSONTopology} */ (object);
     var transform, scale = null, translate = null;
-    if (goog.isDef(topoJSONTopology.transform)) {
+    if (topoJSONTopology.transform) {
       transform = topoJSONTopology.transform;
       scale = transform.scale;
       translate = transform.translate;
     }
     var arcs = topoJSONTopology.arcs;
-    if (goog.isDef(transform)) {
+    if (transform) {
       ol.format.TopoJSON.transformArcs_(arcs, scale, translate);
     }
     /** @type {Array.<ol.Feature>} */