📍 Positional Accuracy

Visually inspect parcel lines on satellite imagery.

Use a tool like Google Earth to check if boundaries align with real-world features like fences, roads, and buildings.

🏷️ Attribute Accuracy

Verify ownership and tax data.

Cross-reference with the official County Assessor's website. Check for correct owner name and tax status.

Verify zoning and land use designation.

Do not trust the GIS layer alone. Check the official County Planning/Zoning map.

⏳ Temporal Accuracy

Check for recent sales and permit activity.

Public records may not reflect a sale from last month. Check the recorder's office for very recent transactions or the building dept. for new permits.

🔗 Topological Accuracy

Check for gaps or overlaps with neighbors.

In your county's GIS viewer, look closely at the subject property and its neighbors. Ensure there are no strange gaps or overlapping lines.