Have a look at the Dutch buildings and addresses in OSM. 99% of buildings in the Netherlands are in OSM with a very accurate outline, and 99.9% of valid addresses. This data is made available by the government under a compatible licence, and mappers use a plugin in JOSM (OSM's standalone editor) to import this data and perform updates. If we mappers find errors in this source data (and we do), then we report it back via an easy to use system the government set up for citizens reporting errors in their geo-data, and eventually the fixed up data gets back to OSM.
We (the Dutch mappers) use several government data sources, from WMTS overlays containing large scale physical objects (kerbs, water, artificial structures, street outlines), to satellite imagery, and half the time we can simply because someone in our community just went and asked for a compatible licence. It's not impossible.
If your government is unable to do this, ask your representatives. Governments benefit hugely from an active community of people who notice errors when they are working on an area in OSM, and the data is already something that exists for the benefit of the citizens whose tax dollars paid for it.
We (the Dutch mappers) use several government data sources, from WMTS overlays containing large scale physical objects (kerbs, water, artificial structures, street outlines), to satellite imagery, and half the time we can simply because someone in our community just went and asked for a compatible licence. It's not impossible.
If your government is unable to do this, ask your representatives. Governments benefit hugely from an active community of people who notice errors when they are working on an area in OSM, and the data is already something that exists for the benefit of the citizens whose tax dollars paid for it.