Hi!

Thanks for your additions!

Just to let you know, it's not really necessary to include a `source` tag on every element. This makes data more difficult to maintain because everyone later has to update this tag when they make any changes. It's also redundant, because we can see element modification history and your changeset tags (i.e. on https://www.openstreetmap.org/changeset/148738302 ), such as `imagery_used` and whatever you specified as `source`. So it's usually enough to just specify that.

Most `source` tags that are included in OSM are for obscure or unclear sources, such as imported data or hard-to-understand elements. While you can technically add them for anything, they will become outdated really quickly. For example, new aerial imagery or someone else surveying or just your GPX track not being public. Most mappers won't even notice the tag. Experience shows that there aren't enough mappers (at least in Latvia) to keep these up to date and the vast majority of `source` values are out of date. It's much more useful to leave a descriptive changeset summary, such as how and why you are modifying something.

Thanks