Property and land value

The DVF register lists every French property transaction; the cadastre gives the parcels and communes they sit in. Neither is useful alone, and joining them by hand produces a spreadsheet nobody else can reproduce.

Here the join is a published workflow: it counts mutations per commune, averages their declared value, and writes a derived dataset back into the catalogue — profiled like any other, so the next question starts from it.

How it runs

1. Register

   Register DVF and the cadastral communes from the public catalogue.

   Harvest

2. Materialize

   Materialize both; the profiler reports their CRS, geometry and quality findings.

   Materialization

3. Join

   Publish a workflow that joins mutations to communes and aggregates by value.

   Workflows

4. Compose

   Compose the output as a choropleth layer with a category widget on the commune.

   Map studio