What I mean by “blank map” is a map devoid of anything other than grass/dirt. I feel stupid having to ask this. The furthest I’ve gotten on my own is getting rid of the forests, lol.
I need this for a custom scenario-thing. If anyone would be willing to lend me a hand, I’d be very thankful.
You can manually nuke the map files, if you’re changing them to just be all grass you can just open the files and change everything to that, right now it’s written as just a bunch of numbers, grass happens to be 16.
This is a real map chunk from save/worldname/maps/x.y.z/x.y.z.map (where the x, y, and z are replaced by numbers)
Ignore the first three lines and change all the numbers in rows to 16s, and you’ll have all grass. Probably worthwhile looking into how to do this in a find/replace operation or at least use a text editor macro. Alternately you can make one copy of the file with all 16s, and swap in the headers for each of your preexisting files.
102 188 0
4800
0
3 17 17 17 19 19 19 19 19 19 19 19
17 17 17 17 19 19 19 19 19 19 19 20
17 3 17 17 19 19 19 19 19 19 19 20
17 3 17 17 19 19 19 19 19 19 19 20
17 17 17 17 19 19 19 19 19 19 19 19
3 17 3 17 19 19 19 19 19 19 19 20
3 3 17 17 19 19 19 19 19 19 19 20
17 17 17 3 19 19 19 19 19 19 19 20
17 3 17 3 19 19 19 19 19 19 19 19
17 17 17 17 19 19 19 19 19 19 19 20
3 17 17 17 19 19 19 19 19 19 19 20
17 17 17 17 19 19 19 19 19 19 19 20
0 144
----
102 189 0
4800
0
17 17 17 17 19 19 19 19 19 19 19 19
3 17 17 17 19 19 19 19 19 19 19 20
17 3 17 3 19 19 19 19 19 19 19 20
17 17 17 17 19 19 19 19 19 19 19 20
17 17 17 3 19 19 19 19 19 19 19 19
17 17 17 17 19 19 19 19 19 19 19 20
17 17 17 3 19 19 19 19 19 19 19 20
17 3 3 17 19 19 19 19 19 19 19 20
3 17 17 17 19 19 19 19 19 19 19 19
17 3 17 3 19 19 19 19 19 19 19 20
17 17 3 17 19 19 19 19 19 19 19 20
17 3 17 3 19 19 19 19 19 19 19 20
0 144
----
103 188 0
4800
0
19 19 19 19 19 19 19 19 17 17 3 17
20 19 19 19 19 19 19 19 17 3 17 17
20 19 19 19 19 19 19 19 17 17 3 17
20 19 19 19 19 19 19 19 17 17 17 3
19 19 19 19 19 19 19 19 17 17 17 3
20 19 19 19 19 19 19 19 17 3 17 17
20 19 19 19 19 19 19 19 17 17 17 17
20 19 19 19 19 19 19 19 3 3 17 17
19 19 19 19 19 19 19 19 3 3 17 17
20 19 19 19 19 19 19 19 17 3 3 17
20 19 19 19 19 19 19 19 17 17 3 17
20 19 19 19 19 19 19 19 17 17 3 3
0 144
----
103 189 0
4800
0
19 19 19 19 19 19 19 19 17 17 17 3
20 19 19 19 19 19 19 19 17 17 17 3
20 19 19 19 19 19 19 19 17 17 3 17
20 19 19 19 19 19 19 19 17 17 17 3
19 19 19 19 19 19 19 19 17 17 3 17
20 19 19 19 19 19 19 19 17 17 17 17
20 19 19 19 19 19 19 19 17 17 17 3
20 19 19 19 19 19 19 19 17 17 17 17
19 19 19 19 19 19 19 19 3 17 17 17
20 19 19 19 19 19 19 19 17 17 17 17
20 19 19 19 19 19 19 19 17 3 17 3
20 19 19 19 19 19 19 19 3 3 3 17
0 144
----Thank you! So replacing the rows of numbers with 16s will replace everything with grass, right? Including the buildings?
Yea, some will also have lists of items, just delete those.
How about debug -> map editor? Might generally come in handy for scenarios.
Kevin, I did as you said and filled the rows with 16s.
I started with 40.139.0.map, copied it after I finished changing the numbers and moved on down; pasting the new code into the rest of the files. I think I might have messed something up along the way though. I loaded up my current world and everything remained the same. Have I done something wrong?
That’s what I have/will be using. 
It’s best to build up from a fresh world, I find. That way I won’t have to build a barrier to keep the player away from the rest of the map or anything like that.
Make a new world, but before you create a character, make a file called “o.0.0”, and insert the following lines:
[tt]
L 10
field 32400
L 9
rock 32400
L 8
rock 32400
L 7
rock 32400
L 6
rock 32400
L 5
rock 32400
L 4
rock 32400
L 3
rock 32400
L 2
rock 32400
L 1
rock 32400
L 0
rock 32400
[/tt]
Put that file in cata-base\save<world name>.
It should create a world composed entirely of fields at the top, and rock underneath. It should be completely barren, no spawns or anything.