MapSplit: draw a movable straight line across the UK and reports a statistic
for each side.
Using it
- Select a dataset from the drop down or upload your own file (see below how to).
Where its numbers came from is listed under Sources, just below the drop down.
- Drag the line across the country;
rotate the handle to any angle.
- Use ↔ Horizontal and ↕ Vertical to
snap back to a level line.
- Check the totals and the partial breakdown in What's being counted. When a
line runs roughly north–south the split is labelled West/East instead of North/South.
- Hover a point to see more a data tooltip.
Loading your own data
Drag a file onto the map, or use the upload button. A dialog lets you confirm which column is which. Accepted files:
CSV/TSV, GeoJSON points or polygons, and JSON or ESRI-ASCII grids.
The minimum each needs:
- CSV/TSV: a column for longitude, one for latitude column, and a numeric value column. An optional text column can group the
points.
- GeoJSON: Point/MultiPoint, or polygons (reduced
to their centroids), with a numeric property.
- Grids: a bounding box (or origin + cell size) and
a numeric value per cell.
IMPORTANT: coordinates must be unprojected WGS84
longitude/latitude in degrees (EPSG:4326).
Development notes
This website was developed by Giuseppe Sollazzo with an LLM-aided workflow using Claude Opus 5 and manual tests.
The datasets were created by cleaning and merging the source data above using a manually created Jupyter notebook
