added an faq entry on copying tiles to another destionation

also added a link to the faq under help on the index page
also clarified the faq entry about adding new features or changing
texture packs
also fixed a typo

docs/faq.rst

@@ -8,6 +8,36 @@ Frequently Asked Questions
 General Questions
 =================
 
+When my map expands, I see remnants of another zoom level
+---------------------------------------------------------
+
+When your map expands ("Your map seems to have expanded beyond its previous
+bounds") you may see tiles at a zoom level that shouldn't be there, usually
+around the borders. This is probably not a bug, but is typically caused by
+copying the map tiles from their render destination to another location (such as
+a web server).
+
+When you're copying the rendered map, you need to be sure files that *don't*
+exist in the source are *deleted* in the destination.
+
+Explanation: When Overviewer re-arranges tiles for another zoom level, it moves
+some tiles tiles at a particular zoom level and placed them at a higher zoom
+level. The tiles that used to be at that zoom level should no longer exist
+there, but if you're copying tiles, there is no mechanism to *delete* those
+files at the destination.
+
+If that explanation doesn't make full sense, then just know that you must do one
+of the following:
+
+* Render the tiles directly to the destination
+
+* Copy the tiles from the render destination in a way that deletes extra files,
+  such as using ``rsync`` with ``--delete``
+
+* Erase and re-copy the files at the final destination when the map expands.
+  Map expansions double the width and height of the map, so you will eventually
+  hit a map size that is unlikely to need another level.
+
 The full map doesn't display even when fully zoomed out!
 --------------------------------------------------------
 
@@ -16,11 +46,13 @@ commandline or in settings.py? If so, try removing it, or increasing the value
 you set.  It's quite likely you don't need it at all. See the documentation for
 the :option:`zoom <-z>` option.
 
-You've added a few feature, but it's not showing up on my map!
+You've added a few feature or changed textures, but it's not showing up on my map!
---------------------------------------------------------------
+----------------------------------------------------------------------------------
 
 Some new features will only show up in newly-rendered areas. Use the
-:option:`--forcerender` option to update the entire map.
+:option:`--forcerender` option to update the entire map. If you have a really
+large map and don't want to re-render everything, take a look at
+the :option:`--stochastic-render` option.
 
 How do I use this on CentOS 5?
 ------------------------------

docs/index.rst

@@ -86,7 +86,10 @@ Help
 **IF YOU NEED HELP COMPILING OR RUNNING THE OVERVIEWER** feel free to chat with
 us live in IRC: #overviewer on Freenode. There's usually someone on there that
 can help you out. Not familiar with IRC? `Use the web client
-<http://webchat.freenode.net/?channels=overviewer>`_. 
+<http://webchat.freenode.net/?channels=overviewer>`_. (If there's no response,
+try a different time of day; we have to sleep sometime)
+
+Also check our :doc:`Frequently Asked Questions <faq>` page.
 
 If you think you've found a bug or other issue, file an issue on our `Issue
 Tracker <https://github.com/overviewer/Minecraft-Overviewer/issues>`_. Filing or

overviewer_core/quadtree.py

@@ -196,7 +196,7 @@ class QuadtreeGen(object):
         curdepth = self._get_cur_depth()
         if curdepth != -1:
             if self.p > curdepth:
-                logging.warning("Your map seemes to have expanded beyond its previous bounds.")
+                logging.warning("Your map seems to have expanded beyond its previous bounds.")
                 logging.warning( "Doing some tile re-arrangements... just a sec...")
                 for _ in xrange(self.p-curdepth):
                     self._increase_depth()