clean up background imagery list by discarding some layers

* regional osm basemaps
* cyclosm
* "Stamen Terrain": too coarse to be used for mapping in iD

.

CHANGELOG.md

@@ -44,6 +44,7 @@ _Breaking developer changes, which may affect downstream projects or sites that
 * Make it easier to search for OSM objects by id ([#9520], thanks [@k-yle])
 * Localize numbers in numeric fields ([#8769], thanks [@1ec5])
 * The Address field now supports the `addr:place` tag (as an alternative to `addr:street`), this functionality is activated in selected countries ([#9603])
+* Clean up background imagery list by discarding layers which are not helpful for mapping
 #### :scissors: Operations
 #### :camera: Street-Level
 #### :white_check_mark: Validation

scripts/update_imagery.js

@@ -21,15 +21,20 @@ cutoffDate.setFullYear(cutoffDate.getFullYear() - 20);
 const discard = {
   'osmbe': true,                        // 'OpenStreetMap (Belgian Style)'
   'osmfr': true,                        // 'OpenStreetMap (French Style)'
+  'osmfr-basque': true,                 // 'OpenStreetMap (Basque Style)'
+  'osmfr-breton': true,                 // 'OpenStreetMap (Breton Style)'
+  'osmfr-occitan': true,                // 'OpenStreetMap (Occitan Style)'
   'osm-mapnik-german_style': true,      // 'OpenStreetMap (German Style)'
   'HDM_HOT': true,                      // 'OpenStreetMap (HOT Style)'
   'osm-mapnik-black_and_white': true,   // 'OpenStreetMap (Standard Black & White)'
   'osm-mapnik-no_labels': true,         // 'OpenStreetMap (Mapnik, no labels)'
   'OpenStreetMap-turistautak': true,    // 'OpenStreetMap (turistautak)'
 
+  'cyclosm': true,                      // 'CyclOSM'
   'hike_n_bike': true,                  // 'Hike & Bike'
   'landsat': true,                      // 'Landsat'
   'skobbler': true,                     // 'Skobbler'
+  'stamen-terrain-background': true,    // 'Stamen Terrain'
   'public_transport_oepnv': true,       // 'Public Transport (ÖPNV)'
   'tf-cycle': true,                     // 'Thunderforest OpenCycleMap'
   'tf-landscape': true,                 // 'Thunderforest Landscape'