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7 Best Practices for Digitizing Scanned As-Builts (That Actually Work)

I've digitized thousands of pages across utility, civil, and municipal projects. Here are the 7 best practices that actually save time — not the theoretical ones you find in GIS textbooks.

1. Trim Before You Upload

The biggest time-waster in digitizing is processing pages you don't need. Before uploading, remove title pages, blank pages, detail drawings at the end, and transmittal sheets. You're charged per page — every unnecessary page costs money and time.

2. Scan at 300 DPI, Not 600

300 DPI is the sweet spot. High enough to see line work clearly, low enough that files aren't 50MB each. At 600 DPI, files are 4× larger, load times increase, and you can't tell the difference when zoomed in anyway.

3. Place on the Basemap First, Then Digitize

Don't digitize first and georeference later. Place your PDF on the basemap first, then digitize. You see real-world context immediately, catch errors early, and don't have to re-digitize after georeferencing. Switch to satellite view for alignment — parcels, driveways, and building footprints give you reliable visual anchors.

4. Name Your Layers Before You Start

Don't begin with "Layer 1" and "Layer 2." Create named layers first: Water Main, Valves, Meters, Laterals, Fire Hydrants. You'll know where each feature goes as you digitize, your attribute table is organized from the start, and your exported GDB has clean structure.

5. Use Snapping, But Verify Connectivity

Snapping is your friend for connecting lines and avoiding gaps — but don't rely on it blindly. A 2-foot gap between two water mains can cause connectivity errors downstream. Always visually verify connectivity after digitizing.

6. Add Attributes as You Go

Don't digitize 50 pages then go back and add attributes to every feature. Add them as you go — you remember what each feature is while it's fresh, catch errors early, and your exported data is ready-to-use immediately.

7. Export, Verify, Then Close

Never digitize, export, and close without verifying. Open the exported file, check the layer structure, verify a sample of attributes, and confirm the coordinate system matches your basemap. Catching errors before handoff beats re-digitizing after someone else finds them.