diff --git a/lib/main.dart b/lib/main.dart
index 88759d07a..208f53f77 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -37,7 +37,11 @@ class HomePage extends StatefulWidget {
 class _HomePageState extends State<HomePage> {
   static const EventChannel eventChannel = EventChannel('deckers.thibault/aves/mediastore');
 
-  ImageCollection localMediaCollection = ImageCollection(List());
+  ImageCollection localMediaCollection = ImageCollection(
+    entries: List(),
+    groupFactor: settings.collectionGroupFactor,
+    sortFactor: settings.collectionSortFactor,
+  );
 
   @override
   void initState() {
@@ -56,7 +60,7 @@ class _HomePageState extends State<HomePage> {
     await metadataDb.init();
 
     eventChannel.receiveBroadcastStream().cast<Map>().listen(
-          (entryMap) => localMediaCollection.entries.add(ImageEntry.fromMap(entryMap)),
+          (entryMap) => localMediaCollection.add(ImageEntry.fromMap(entryMap)),
           onDone: () async {
             debugPrint('mediastore stream done');
             await localMediaCollection.loadCatalogMetadata();
diff --git a/lib/model/image_collection.dart b/lib/model/image_collection.dart
index 87faafa33..3e2bad9ff 100644
--- a/lib/model/image_collection.dart
+++ b/lib/model/image_collection.dart
@@ -6,31 +6,62 @@ import "package:collection/collection.dart";
 import 'package:flutter/material.dart';
 
 class ImageCollection with ChangeNotifier {
-  final List<ImageEntry> entries;
-
+  final List<ImageEntry> _rawEntries;
   GroupFactor groupFactor = GroupFactor.date;
+  SortFactor sortFactor = SortFactor.date;
 
-  ImageCollection(this.entries);
+  ImageCollection({
+    @required List<ImageEntry> entries,
+    @required this.groupFactor,
+    @required this.sortFactor,
+  }) : _rawEntries = entries;
 
   Map<dynamic, List<ImageEntry>> get sections {
-    switch (groupFactor) {
-      case GroupFactor.album:
-        return groupBy(entries, (entry) => entry.bucketDisplayName);
-      case GroupFactor.date:
-        return groupBy(entries, (entry) => entry.monthTaken);
+    switch (sortFactor) {
+      case SortFactor.date:
+        switch (groupFactor) {
+          case GroupFactor.album:
+            return groupBy(_rawEntries, (entry) => entry.bucketDisplayName);
+          case GroupFactor.date:
+            return groupBy(_rawEntries, (entry) => entry.monthTaken);
+        }
+        break;
+      case SortFactor.size:
+        return Map.fromEntries([MapEntry('All', _rawEntries)]);
     }
     return Map();
   }
 
+  List<ImageEntry> get sortedEntries {
+    return List.unmodifiable(sections.entries.expand((e) => e.value));
+  }
+
   group(GroupFactor groupFactor) {
     this.groupFactor = groupFactor;
     notifyListeners();
   }
 
+  sort(SortFactor sortFactor) {
+    this.sortFactor = sortFactor;
+
+    switch (sortFactor) {
+      case SortFactor.date:
+        _rawEntries.sort((a, b) => b.bestDate.compareTo(a.bestDate));
+        break;
+      case SortFactor.size:
+        _rawEntries.sort((a, b) => b.sizeBytes.compareTo(a.sizeBytes));
+        break;
+    }
+
+    notifyListeners();
+  }
+
+  add(ImageEntry entry) => _rawEntries.add(entry);
+
   Future<bool> delete(ImageEntry entry) async {
     final success = await ImageFileService.delete(entry);
     if (success) {
-      entries.remove(entry);
+      _rawEntries.remove(entry);
       notifyListeners();
     }
     return success;
@@ -40,7 +71,7 @@ class ImageCollection with ChangeNotifier {
     debugPrint('$runtimeType loadCatalogMetadata start');
     final start = DateTime.now();
     final saved = await metadataDb.loadMetadataEntries();
-    entries.forEach((entry) {
+    _rawEntries.forEach((entry) {
       final contentId = entry.contentId;
       if (contentId != null) {
         entry.catalogMetadata = saved.firstWhere((metadata) => metadata.contentId == contentId, orElse: () => null);
@@ -53,7 +84,7 @@ class ImageCollection with ChangeNotifier {
     debugPrint('$runtimeType loadAddresses start');
     final start = DateTime.now();
     final saved = await metadataDb.loadAddresses();
-    entries.forEach((entry) {
+    _rawEntries.forEach((entry) {
       final contentId = entry.contentId;
       if (contentId != null) {
         entry.addressDetails = saved.firstWhere((address) => address.contentId == contentId, orElse: () => null);
@@ -65,24 +96,23 @@ class ImageCollection with ChangeNotifier {
   catalogEntries() async {
     debugPrint('$runtimeType catalogEntries start');
     final start = DateTime.now();
-    final uncataloguedEntries = entries.where((entry) => !entry.isCatalogued);
+    final uncataloguedEntries = _rawEntries.where((entry) => !entry.isCatalogued);
     final newMetadata = List<CatalogMetadata>();
     await Future.forEach<ImageEntry>(uncataloguedEntries, (entry) async {
       await entry.catalog();
       newMetadata.add(entry.catalogMetadata);
     });
+    metadataDb.saveMetadata(List.unmodifiable(newMetadata));
     debugPrint('$runtimeType catalogEntries complete in ${DateTime.now().difference(start).inSeconds}s with ${newMetadata.length} new entries');
 
-    // sort with more accurate date
-    entries.sort((a, b) => b.bestDate.compareTo(a.bestDate));
-
-    metadataDb.saveMetadata(List.unmodifiable(newMetadata));
+    // notify because metadata dates might change groups and order
+    notifyListeners();
   }
 
   locateEntries() async {
     debugPrint('$runtimeType locateEntries start');
     final start = DateTime.now();
-    final unlocatedEntries = entries.where((entry) => !entry.isLocated);
+    final unlocatedEntries = _rawEntries.where((entry) => entry.hasGps && !entry.isLocated);
     final newAddresses = List<AddressDetails>();
     await Future.forEach<ImageEntry>(unlocatedEntries, (entry) async {
       await entry.locate();
@@ -92,8 +122,11 @@ class ImageCollection with ChangeNotifier {
         newAddresses.clear();
       }
     });
+    metadataDb.saveAddresses(List.unmodifiable(newAddresses));
     debugPrint('$runtimeType locateEntries complete in ${DateTime.now().difference(start).inSeconds}s');
   }
 }
 
+enum SortFactor { date, size }
+
 enum GroupFactor { album, date }
diff --git a/lib/model/image_entry.dart b/lib/model/image_entry.dart
index eca6e4a73..cbcaaf58d 100644
--- a/lib/model/image_entry.dart
+++ b/lib/model/image_entry.dart
@@ -147,27 +147,28 @@ class ImageEntry with ChangeNotifier {
 
   locate() async {
     if (isLocated) return;
+
     await catalog();
     final latitude = catalogMetadata?.latitude;
     final longitude = catalogMetadata?.longitude;
-    if (latitude != null && longitude != null) {
-      final coordinates = Coordinates(latitude, longitude);
-      try {
-        final addresses = await Geocoder.local.findAddressesFromCoordinates(coordinates);
-        if (addresses != null && addresses.length > 0) {
-          final address = addresses.first;
-          addressDetails = AddressDetails(
-            contentId: contentId,
-            addressLine: address.addressLine,
-            countryName: address.countryName,
-            adminArea: address.adminArea,
-            locality: address.locality,
-          );
-          notifyListeners();
-        }
-      } catch (e) {
-        debugPrint('$runtimeType addAddressToMetadata failed with exception=${e.message}');
+    if (latitude == null || longitude == null) return;
+
+    final coordinates = Coordinates(latitude, longitude);
+    try {
+      final addresses = await Geocoder.local.findAddressesFromCoordinates(coordinates);
+      if (addresses != null && addresses.length > 0) {
+        final address = addresses.first;
+        addressDetails = AddressDetails(
+          contentId: contentId,
+          addressLine: address.addressLine,
+          countryName: address.countryName,
+          adminArea: address.adminArea,
+          locality: address.locality,
+        );
+        notifyListeners();
       }
+    } catch (e) {
+      debugPrint('$runtimeType addAddressToMetadata failed with exception=${e.message}');
     }
   }
 
diff --git a/lib/model/image_file_service.dart b/lib/model/image_file_service.dart
index ef47f4f03..3c8e995d2 100644
--- a/lib/model/image_file_service.dart
+++ b/lib/model/image_file_service.dart
@@ -16,7 +16,6 @@ class ImageFileService {
   }
 
   static Future<Uint8List> getImageBytes(ImageEntry entry, int width, int height) async {
-//    debugPrint('getImageBytes with path=${entry.path} contentId=${entry.contentId}');
     if (width > 0 && height > 0) {
       try {
         final result = await platform.invokeMethod('getImageBytes', <String, dynamic>{
@@ -32,16 +31,6 @@ class ImageFileService {
     return Uint8List(0);
   }
 
-  static cancelGetImageBytes(String uri) async {
-    try {
-      await platform.invokeMethod('cancelGetImageBytes', <String, dynamic>{
-        'uri': uri,
-      });
-    } on PlatformException catch (e) {
-      debugPrint('cancelGetImageBytes failed with exception=${e.message}');
-    }
-  }
-
   static Future<bool> delete(ImageEntry entry) async {
     try {
       await platform.invokeMethod('delete', <String, dynamic>{
diff --git a/lib/model/settings.dart b/lib/model/settings.dart
index 66329fa13..e891bdee6 100644
--- a/lib/model/settings.dart
+++ b/lib/model/settings.dart
@@ -1,3 +1,4 @@
+import 'package:aves/model/image_collection.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:shared_preferences/shared_preferences.dart';
@@ -14,6 +15,8 @@ class Settings {
   Settings._private();
 
   // preferences
+  static const collectionGroupFactorKey = 'collection_group_factor';
+  static const collectionSortFactorKey = 'collection_sort_factor';
   static const infoMapZoomKey = 'info_map_zoom';
 
   init() async {
@@ -44,10 +47,28 @@ class Settings {
 
   set infoMapZoom(double newValue) => setAndNotify(infoMapZoomKey, newValue);
 
+  GroupFactor get collectionGroupFactor => getEnumOrDefault(collectionGroupFactorKey, GroupFactor.date, GroupFactor.values);
+
+  set collectionGroupFactor(GroupFactor newValue) => setAndNotify(collectionGroupFactorKey, newValue.toString());
+
+  SortFactor get collectionSortFactor => getEnumOrDefault(collectionSortFactorKey, SortFactor.date, SortFactor.values);
+
+  set collectionSortFactor(SortFactor newValue) => setAndNotify(collectionSortFactorKey, newValue.toString());
+
   // convenience methods
 
   bool getBoolOrDefault(String key, bool defaultValue) => prefs.getKeys().contains(key) ? prefs.getBool(key) : defaultValue;
 
+  T getEnumOrDefault<T>(String key, T defaultValue, List<T> values) {
+    final valueString = prefs.getString(key);
+    for (T element in values) {
+      if (element.toString() == valueString) {
+        return element;
+      }
+    }
+    return defaultValue;
+  }
+
   setAndNotify(String key, dynamic newValue) {
     var oldValue = prefs.get(key);
     if (newValue == null) {
diff --git a/lib/widgets/album/all_collection_page.dart b/lib/widgets/album/all_collection_page.dart
index 820650c37..8bfad8be7 100644
--- a/lib/widgets/album/all_collection_page.dart
+++ b/lib/widgets/album/all_collection_page.dart
@@ -1,4 +1,5 @@
 import 'package:aves/model/image_collection.dart';
+import 'package:aves/model/settings.dart';
 import 'package:aves/widgets/album/search_delegate.dart';
 import 'package:aves/widgets/album/thumbnail_collection.dart';
 import 'package:aves/widgets/common/menu_row.dart';
@@ -27,16 +28,27 @@ class AllCollectionPage extends StatelessWidget {
           PopupMenuButton<AlbumAction>(
             itemBuilder: (context) => [
               PopupMenuItem(
-                value: AlbumAction.groupByAlbum,
-                child: MenuRow(text: 'Group by album', checked: collection.groupFactor == GroupFactor.album),
+                value: AlbumAction.sortByDate,
+                child: MenuRow(text: 'Sort by date', checked: collection.sortFactor == SortFactor.date),
               ),
               PopupMenuItem(
-                value: AlbumAction.groupByDate,
-                child: MenuRow(text: 'Group by date', checked: collection.groupFactor == GroupFactor.date),
+                value: AlbumAction.sortBySize,
+                child: MenuRow(text: 'Sort by size', checked: collection.sortFactor == SortFactor.size),
               ),
               PopupMenuDivider(),
+              if (collection.sortFactor == SortFactor.date) ...[
+                PopupMenuItem(
+                  value: AlbumAction.groupByAlbum,
+                  child: MenuRow(text: 'Group by album', checked: collection.groupFactor == GroupFactor.album),
+                ),
+                PopupMenuItem(
+                  value: AlbumAction.groupByDate,
+                  child: MenuRow(text: 'Group by date', checked: collection.groupFactor == GroupFactor.date),
+                ),
+                PopupMenuDivider(),
+              ],
               PopupMenuItem(
-                value: AlbumAction.groupByAlbum,
+                value: AlbumAction.debug,
                 child: MenuRow(text: 'Debug', icon: Icons.whatshot),
               ),
             ],
@@ -50,14 +62,22 @@ class AllCollectionPage extends StatelessWidget {
 
   onActionSelected(BuildContext context, AlbumAction action) {
     switch (action) {
+      case AlbumAction.debug:
+        goToDebug(context);
+        break;
       case AlbumAction.groupByAlbum:
         collection.group(GroupFactor.album);
         break;
       case AlbumAction.groupByDate:
         collection.group(GroupFactor.date);
         break;
-      case AlbumAction.debug:
-        goToDebug(context);
+      case AlbumAction.sortByDate:
+        settings.collectionSortFactor = SortFactor.date;
+        collection.sort(SortFactor.date);
+        break;
+      case AlbumAction.sortBySize:
+        settings.collectionSortFactor = SortFactor.size;
+        collection.sort(SortFactor.size);
         break;
     }
   }
@@ -67,11 +87,11 @@ class AllCollectionPage extends StatelessWidget {
       context,
       MaterialPageRoute(
         builder: (context) => DebugPage(
-          entries: collection.entries,
+          entries: collection.sortedEntries,
         ),
       ),
     );
   }
 }
 
-enum AlbumAction { groupByDate, groupByAlbum, debug }
+enum AlbumAction { debug, groupByAlbum, groupByDate, sortByDate, sortBySize }
diff --git a/lib/widgets/album/search_delegate.dart b/lib/widgets/album/search_delegate.dart
index 43c8df23d..227a90048 100644
--- a/lib/widgets/album/search_delegate.dart
+++ b/lib/widgets/album/search_delegate.dart
@@ -52,7 +52,7 @@ class ImageSearchDelegate extends SearchDelegate<ImageEntry> {
       return SizedBox.shrink();
     }
     final lowerQuery = query.toLowerCase();
-    final matches = collection.entries.where((entry) => entry.search(lowerQuery)).toList();
+    final matches = collection.sortedEntries.where((entry) => entry.search(lowerQuery)).toList();
     if (matches.isEmpty) {
       return Center(
         child: Text(
@@ -61,6 +61,12 @@ class ImageSearchDelegate extends SearchDelegate<ImageEntry> {
         ),
       );
     }
-    return ThumbnailCollection(collection: ImageCollection(matches));
+    return ThumbnailCollection(
+      collection: ImageCollection(
+        entries: matches,
+        groupFactor: collection.groupFactor,
+        sortFactor: collection.sortFactor,
+      ),
+    );
   }
 }
diff --git a/lib/widgets/album/thumbnail.dart b/lib/widgets/album/thumbnail.dart
index f6b1c1a27..5a32ddfe8 100644
--- a/lib/widgets/album/thumbnail.dart
+++ b/lib/widgets/album/thumbnail.dart
@@ -54,7 +54,6 @@ class ThumbnailState extends State<Thumbnail> {
   @override
   void dispose() {
     entry.removeListener(onEntryChange);
-    ImageFileService.cancelGetImageBytes(uri);
     super.dispose();
   }
 
diff --git a/lib/widgets/album/thumbnail_collection.dart b/lib/widgets/album/thumbnail_collection.dart
index 03ed8e20b..1808fda3b 100644
--- a/lib/widgets/album/thumbnail_collection.dart
+++ b/lib/widgets/album/thumbnail_collection.dart
@@ -91,10 +91,20 @@ class SectionSliver extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-//    debugPrint('$runtimeType build with sectionKey=$sectionKey');
     final columnCount = 4;
+    Widget header = SizedBox.shrink();
+    if (collection.sortFactor == SortFactor.date) {
+      switch (collection.groupFactor) {
+        case GroupFactor.album:
+          header = SectionHeader(text: sectionKey);
+          break;
+        case GroupFactor.date:
+          header = MonthSectionHeader(date: sectionKey);
+          break;
+      }
+    }
     return SliverStickyHeader(
-      header: collection.groupFactor == GroupFactor.date ? MonthSectionHeader(date: sectionKey) : SectionHeader(text: sectionKey),
+      header: header,
       sliver: SliverGrid(
         delegate: SliverChildBuilderDelegate(
           (sliverContext, index) {
diff --git a/lib/widgets/debug_page.dart b/lib/widgets/debug_page.dart
index 75eaa8382..52b030848 100644
--- a/lib/widgets/debug_page.dart
+++ b/lib/widgets/debug_page.dart
@@ -1,6 +1,7 @@
 import 'package:aves/model/image_entry.dart';
 import 'package:aves/model/image_metadata.dart';
 import 'package:aves/model/metadata_db.dart';
+import 'package:aves/model/settings.dart';
 import 'package:collection/collection.dart';
 import 'package:flutter/material.dart';
 
@@ -39,6 +40,11 @@ class DebugPageState extends State<DebugPage> {
       body: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
+          Text('Settings'),
+          Text('collectionGroupFactor: ${settings.collectionGroupFactor}'),
+          Text('collectionSortFactor: ${settings.collectionSortFactor}'),
+          Text('infoMapZoom: ${settings.infoMapZoom}'),
+          Divider(),
           Text('Entries: ${entries.length}'),
           ...byMimeTypes.keys.map((mimeType) => Text('- $mimeType: ${byMimeTypes[mimeType].length}')),
           Text('Catalogued: ${catalogued.length}'),
diff --git a/lib/widgets/fullscreen/image_page.dart b/lib/widgets/fullscreen/image_page.dart
index c0269e687..df0f8e768 100644
--- a/lib/widgets/fullscreen/image_page.dart
+++ b/lib/widgets/fullscreen/image_page.dart
@@ -100,7 +100,7 @@ class FullscreenBodyState extends State<FullscreenBody> with SingleTickerProvide
 
   ImageCollection get collection => widget.collection;
 
-  List<ImageEntry> get entries => widget.collection.entries;
+  List<ImageEntry> get entries => widget.collection.sortedEntries;
 
   @override
   void initState() {
@@ -342,7 +342,7 @@ class ImagePage extends StatefulWidget {
 }
 
 class ImagePageState extends State<ImagePage> with AutomaticKeepAliveClientMixin {
-  List<ImageEntry> get entries => widget.collection.entries;
+  List<ImageEntry> get entries => widget.collection.sortedEntries;
 
   @override
   Widget build(BuildContext context) {