Airspace Survey

Measure the connected air inside an irregular Minecraft room, and trace an opening toward a chosen survey boundary.

Use

Install the matching server version (or in your singleplayer instance), stand in an air block, and run /airspacesurvey scan. Optional radius: /airspacesurvey scan 2 through /airspacesurvey scan 16; default 12. /airspacesurvey shows help.

The survey reports connected air cells, bounding coordinates and dimensions. If air reaches the survey radius, it reports the shortest observed route to that boundary as axis-aligned waypoints. It prints at most ten waypoints and the final boundary coordinate when a route is longer. This can help locate a gap in a room without changing your build.

What the report means

Only face-connected air blocks count. Glass, slabs, doors (open or closed), water and every other non-air block stop the survey. This is an architectural air-cell model, not an oxygen, fluid-tightness, mob pathfinding or spawn-proofing simulation.

“Enclosed within inspected region” means traversal completed without reaching the radius, an unloaded chunk, the world's build-height edge, or the 4,096-cell limit. Otherwise the room volume is explicitly incomplete. Reaching the radius does not prove that a building opens to the outdoors: the room may simply extend beyond the selected region. Coordinates and volume are for observed cells only.

No blocks or inventories are changed. No chunks are loaded. Scans are on demand, have a five-second per-player cooldown, and are capped at 4,096 connected air cells and radius 16. The command does not integrate with claim permissions and can report connected air across claims. Server owners should consider this information visibility before installation. Reports are sent only to the requesting player.

Versions and installation

• Minecraft 1.20.1: Forge, Java 17.
• Minecraft 1.21.1: NeoForge, Java 21.
• Minecraft 26.3: NeoForge, Java 25.

Choose the matching file; files are not interchangeable. Multiplayer clients do not need the mod. In singleplayer, install it in your matching Forge/NeoForge instance.

Beta and license

New beta release; bugs may remain. Original code under the MIT license, attributed to RickCode.

Testing: 1,014 pure-core assertions passed on Java 17, 21 and 25. Exact release JARs passed installed dedicated-server startup and separate gameplay QA on each listed loader/version, including real commands, a closed glass room, an opening path, safe unloaded-region handling and unchanged blocks. Graphical Minecraft client testing has not been performed.

Provenance and credits

Airspace Survey reuses MIT-licensed command-support code and loader scaffolding from Field Tally, also by RickCode. Its connected-air traversal, room-volume measurement and boundary-route reporting were written specifically for this project. Field Tally counts crops and farmland; Airspace Survey instead measures face-connected air and reports an observed route to the survey boundary. It does not include Field Tally’s crop-auditing feature and does not require Field Tally to be installed. The MIT copyright and license notice are included in each file.