|source = PGS|
|Prototype Global Shoreline: coastline data from the US National Geospatial-Intelligence Agency|
|Used on these elements|
|Status: in use|
|Tools for this tag|
Although this tag is mainly about ways, it also appears on many nodes. Years ago it was typical for imports to put metadata tags, such as source=*, on all nodes even if those nodes are merely parts of ways. This import tagging scheme became less popular after the bloated TIGER node tags, introduction of changeset tags, and recommendations for dedicated import user accounts (see import guidelines).
Since high-quality imagery now available nearly globally, refining the crude PGS coastlines is encouraged.