Please implement the free and open DTM1 data from Kartverket aka the Norwegian Mapping Authority.
The DTM sets that is available as WMS services are the top 6 links here:
https://kartkatalog.geonorge.no/metadata/hoeyde-dtm-1-utm35-wms/9ecc47f9-2d10-4387-b033-90d99e104980
https://kartkatalog.geonorge.no/metadata/hoeyde-dtm-1-utm33-wms/4d07b725-40c1-455a-a3b3-7398bb4022d1
https://kartkatalog.geonorge.no/metadata/hoeyde-dtm-1-utm32-wms/c86c9db6-90d5-4b23-9b15-673050b35d33
https://kartkatalog.geonorge.no/metadata/hoeyde-dtm-1-utm35-wcs/bac437e4-748d-4748-b2b0-975a1a694cf0
https://kartkatalog.geonorge.no/metadata/hoeyde-dtm-1-utm33-wcs/3776e807-8ae6-4a9c-8481-e2c9f6333e23
https://kartkatalog.geonorge.no/metadata/hoeyde-dtm-1-utm32-wcs/600e3b86-64bd-4c31-8b26-a552a621c5a8
Also:
HTTPS://hoydedata.no/arcgis/rest/services
All the data is licensed under :
Creative Commons BY 4.0 (CC BY 4.0)