GIS Troubleshooting

Why satellite images don’t align with your map

BGPD Labs · Spatial Intelligence Lab

If a satellite image does not line up with your GIS, CAD or base map layers, the issue is usually related to coordinates, projection, georeferencing or image correction.

Common causes

• Different coordinate reference systems: layers may be stored in different CRS definitions.
• Missing projection metadata: the raster may not tell the GIS where it belongs.
• Wrong datum or UTM zone: small configuration differences can move layers significantly.
• Uncorrected imagery: raw images may require geometric correction before reliable overlay.
• CAD files without geospatial context: drawings often need proper georeferencing before comparison.

Quick checks

1. Confirm the CRS of every layer.
2. Use on-the-fly projection carefully, but do not confuse it with fixing bad data.
3. Check whether the raster has a valid geotransform.
4. Use known control points when georeferencing is required.
5. Document the final CRS before delivering maps or analysis.

Why this matters

Misalignment can create false conclusions: a road appears shifted, a property boundary seems wrong, or a detected change is assigned to the wrong parcel. Spatial intelligence depends on spatial trust.