Hello

I'm Markus Lehtola.

I work with data and write about what I learn along the way. This is my corner of the web — a mix of essays, notes, and the projects I'm tinkering with.

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Writing

Part 2: Turning 7.7 Million LiDAR Points into a Lightweight 3D Terrain for a Fabric Digital Twin

June 12, 2026

How we turned 7.7 million open LiDAR points into a 6,500-vertex terrain mesh that runs smoothly in any browser, using only free Finnish government data — plus modeling the wind turbine in Blender with Copilot.

Writing

Building a Fabric Digital Twin with Rayfin — Part 1: From Scaffold to Live Data

June 10, 2026

Standing up a Microsoft Fabric Rayfin app from an empty workspace to a 3D scene that renders live telemetry from a real database.