1) Position of Station<br /></p><p>2) Position of Sensor/Equipment<br /></p><p>3) Position of what's being observed<br /></p><p><br /></p><p>Positions could be up to 3D (could be a volume).<br /></p><p>Positions are recorded above a reference surface (e.g. height of sensor above lowest astronomical ground, height of anemometer above a tree canopy).<br /></p><p><br /></p><p>WMO standard is WGS84 for coordinate reference systems.<br /></p><p><br /></p><p>(note, Bruce - these datums do change sometimes. e.g. GDA94 is changing to GDA2020 and then to a dynamic datum).<br /></p><p><br /></p><p>WIGOS metadata captures 'method' used to capture geospatial information (e.g. GPS etc.)<br /></p>