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Flattening a PDF form? Keep an editable copy before you send it

A customer fills in a PDF request form, downloads it, and emails it back. Your reviewer needs a copy to read. The customer may still need to correct an address tomorrow. Those are different requirements, even when both files look the same on screen. Flattening can be useful for a delivery copy, but it should not silently replace the working document. The useful question is: what must the next…

We haven't written up this one. Dev.to has the full story — the link below goes straight to it.

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From Footprints to Massing: Engineering a Citywide 3D Model of New York

My first attempt at extruding a city took an afternoon. Building polygons in, heights in, solids out, and it looked fine in the viewer. Then I tried to use it.

  • NYC's citywide 3D model built for Dept. of IT & Telecommunications
  • Model uses planimetric mapping, heights, and digital elevation model
  • Errors addressed via height provenance, confidence flags, and versioning

How UV-C LED Water Disinfection Works – Water Treatment Engineers' Guide

By yoyo-uv — drafted with AI assistance and edited by people Abstract With advancements in UV-C LED technology, new possibilities arise for compact and energy-efficient water disinfection systems.

  • UV-C LEDs expose water to germicidal UV radiation, destroying microorganism DNA.
  • System efficiency depends on UV dose, water quality, and reactor design.
  • Applications include residential filters, RVs, and marine systems.

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