Validate geometries before overlay work
Run geometry validity checks before overlay, dissolve, and spatial join operations.
Validate before overlay. Spatial engines need well-formed geometry to make reliable topological decisions. A self-intersecting polygon may look like a parcel, but the engine cannot know which side is inside with the same confidence as a valid polygon. Check Run a validity check before overlay, clip, dissolve, and heavy spatial joins. Summarize both the count and the reason. Repair or quarantine Use a deliberate repair method, then compare before and after counts and areas. If repair changes the business meaning, quarantine the feature and escalate it. Reconcile After the operation, compare record counts, total area, and key IDs. The QA…
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