Four colours of certainty — how Pásek admits what it really knows

An old farmhouse has no right angles. The walls have tilted over a century, plaster has gained centimetres, and the "straight" wall is only straight from a distance. An app that shows you the area of such a house to two decimal places, no caveats attached, is lying to your face.

Pásek does it differently: every measurement carries its origin and its uncertainty. You see both at a glance — by colour.

Where a measurement comes from

• Green — measured. You verified it with a tape or laser. Highest confidence, ±0.5 % tolerance.
• Yellow — LiDAR. A value from the scan. Great for the whole, but it rounds the edges; expect ±2 %.
• Red — estimate. Eyeballed or derived. ±10 % tolerance and a colour that shouts "verify me".
• Blue — cadastre. Taken from public records. An orientation layer, not a boundary survey.

Manual always wins: re-measure a wall with a tape and the scan yields to it — the measurement locks. No future re-scan will overwrite it.

How uncertainty adds up

Tolerance isn't a sticker, it's arithmetic. Pásek propagates errors honestly:

• Area = width × length → relative errors add up. A wall at ±0.5 % times a wall at ±0.7 % gives an area at ±1.2 %.
• Perimeter = sum of sides → absolute errors add up, side by side.
• A room's summary follows its worst measurement — a single eyeballed number drags down the certainty of the whole room.

You read the result right on the plan: 21.4 m² ±1.2 %. The number, and right next to it, how much to trust it.

Why it matters

When planning a renovation, it matters whether you're buying flooring for 21 m² or "roughly a room's worth". A declared tolerance tells you how much margin to order — and which wall is worth re-measuring before the material arrives.

Pásek is an orientation tool. For official documentation or boundary surveys you need a licensed surveyor — no app will spare you that.

This declared uncertainty is the thread running through all of Pásek — from the room scan to the real, unstraightened angles. That wraps up the build diary for now. Thanks for reading — and write to us any time about what you'd like to see in Pásek next.