Data from https://www.data.gouv.fr/fr/datasets/programme-territoires-dindustrie/
wget https://static.data.gouv.fr/resources/programme-territoires-dindustrie/20240704-091848/liste-ti-com2023-20240704.csv # 2023-2027
wget https://static.data.gouv.fr/resources/programme-territoires-dindustrie/20230802-130420/liste-ti-com2023-20230802.csv # 2018-2023
wget https://files.opendatarchives.fr/professionnels.ign.fr/adminexpress/ADMIN-EXPRESS-COG_3-2__SHP_WGS84G_FRA_2023-05-03.7z
7z e ADMIN-EXPRESS-COG_3-2__SHP_WGS84G_FRA_2023-05-03.7z COMMUNE.* -r -aoa
# Merging communes for 2018-2023
mapshaper COMMUNE.shp -join liste-ti-com2023-20230802.csv keys=INSEE_COM,insee_com string-fields=INSEE_COM,insee_com,id_ti,lib_ti unjoined unmatched -filter 'id_ti != null' -dissolve fields=id_ti copy-fields=id_ti,lib_ti -o ti-com2023-2018-2023.geojson
mapshaper COMMUNE.shp -join liste-ti-com2023-20230802.csv keys=INSEE_COM,insee_com string-fields=INSEE_COM,insee_com,id_ti,lib_ti unjoined unmatched -filter 'id_ti != null' -dissolve fields=id_ti copy-fields=id_ti,lib_ti -simplify keep-shapes interval=5 -o ti-com2023-2018-2023-5m.geojson
mapshaper COMMUNE.shp -join liste-ti-com2023-20230802.csv keys=INSEE_COM,insee_com string-fields=INSEE_COM,insee_com,id_ti,lib_ti unjoined unmatched -filter 'id_ti != null' -dissolve fields=id_ti copy-fields=id_ti,lib_ti -simplify keep-shapes interval=50 -o ti-com2023-2018-2023-50m.geojson
# Merging communes for 2023-2027
mapshaper COMMUNE.shp -join liste-ti-com2023-20240704.csv keys=INSEE_COM,insee_com string-fields=INSEE_COM,insee_com,id_ti,lib_ti unjoined unmatched -filter 'id_ti != null' -dissolve fields=id_ti copy-fields=id_ti,lib_ti -o ti-com2023-2023-2027.geojson
mapshaper COMMUNE.shp -join liste-ti-com2023-20240704.csv keys=INSEE_COM,insee_com string-fields=INSEE_COM,insee_com,id_ti,lib_ti unjoined unmatched -filter 'id_ti != null' -dissolve fields=id_ti copy-fields=id_ti,lib_ti -simplify keep-shapes interval=5 -o ti-com2023-2023-2027-5m.geojson
mapshaper COMMUNE.shp -join liste-ti-com2023-20240704.csv keys=INSEE_COM,insee_com string-fields=INSEE_COM,insee_com,id_ti,lib_ti unjoined unmatched -filter 'id_ti != null' -dissolve fields=id_ti copy-fields=id_ti,lib_ti -simplify keep-shapes interval=50 -o ti-com2023-2023-2027-50m.geojson
du -cksh ti-com*.geojson # Below output
# 7,3M ti-com2023-2018-2023-50m.geojson
# 36M ti-com2023-2018-2023-5m.geojson
# 78M ti-com2023-2018-2023.geojson
# 8,6M ti-com2023-2023-2027-50m.geojson
# 44M ti-com2023-2023-2027-5m.geojson
# 96M ti-com2023-2023-2027.geojson
# 268M total