custom map doesn't display properly

Hi mappr,

The "projected from a single point" visual is a classic symptom of a quantization/transform issue in the TopoJSON file. When Mapshaper exports with quantization enabled (which is the default), it encodes coordinates as integers with a transform object (scale + translate). Power BI's Shape Map visual does not handle this transform correctly and collapses all polygons toward a single origin point.

Here are the steps to fix it:

1. Re-export from Mapshaper without quantization
In the Mapshaper CLI or web interface, export using the no-quantize flag:

mapshaper sask2.shp -o format=topojson no-quantize sask2.json

This ensures coordinates are stored as plain floating-point longitude/latitude values, which Power BI can read correctly.

2. Alternative: Export as GeoJSON first from QGIS, then convert
In QGIS, export your layer as GeoJSON (CRS: EPSG:4326), then convert in Mapshaper:

mapshaper sask2.geojson -o format=topojson no-quantize sask2.json

3. Set the projection in Power BI Shape Map
After loading the corrected TopoJSON, in the Format pane > Map settings, set Projection to Equirectangular (not Mercator), which is the correct setting for unprojected WGS84 (EPSG:4326) coordinates.

4. Verify the key field
Use Format > Map settings > View map type key to confirm that the CDUID values in your TopoJSON match exactly the values in your data table's Location field.

The root cause is almost certainly the quantization. Re-exporting with no-quantize should resolve the display issue immediately.

Hope this helps!