Delete unused chunks automatically.
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README.md

Minecraft Map Auto Trim

Help you delete unnecessary trunks.

Usage

java -jar mmat.jar -w <world path> [-d <dilation size>] [-p <id list>] [-r <minX,maxX,minZ,maxZ>] [-y <yBegin,yEnd>]

Where:

-w <world path>    Path to the world folders
-d <dilation size>    Dilate preserved area to perserve more chunks around the chunks with "perserve block".
-p <id list>    Define a list of "perserve block".If a chunk contains any "perserve block", it will be preserved.
-r <rect>    If specified, all the chunks outside this rectangle will be forced to delete.
-y <yBegin,yEnd>    If specified, only scan this range of height.

Examples:

java -jar mmat.jar -w ~/minecraft/world
java -jar mmat.jar -w ~/minecraft/world -d 3 -p 63,68 -r -1000,1000,-1000,1000 -y 64,256

Forum Thread

http://forums.bukkit.org/threads/tool-admin-minecraft-map-auto-trim-v0-2.37846/