START: Receive Data
Has EPSG Code / CRS Metadata?
4. The "Satellite Match" Test
Mathematical precision is useless if your map is wrong. You MUST verify:
Step A: Overlay
Import points into Google Earth or ArcGIS Earth.
Step B: Visual Check
Do points land on the intended physical feature (e.g., manhole, corner)?
INVALID IF: Points shift > 1 meter from visual feature.
(Likely Datum Shift: WGS84 vs Local Grid)
Professional Verification
Disclaimer
This content is provided for decision-support and educational purposes for geospatial professionals and does not
constitute legal, surveying, or engineering advice.
Regulations and official standards vary by jurisdiction and project scope. Information is based on publicly
available standards as of January 11, 2026.
For critical projects, always verify current requirements with:
- Licensed Professional Surveyors or Professional Engineers
(PE) in the relevant jurisdiction
- Certified attorneys for legal interpretation of regulations
- Current guidelines from relevant
authorities (FAA, JCAB, GSI, etc.)
Reference: Professional Use & Scope