When will SLIP provide datasets in GDA2020?
The SLIP Data Download solution is being redeveloped to deliver geospatial snapshots in both GDA2020 and GDA94 by June 2021.
Can I publish GDA2020 data to SLIP?
Yes, our SLIP Data Upload Tool (DUT) has been updated to consume and transform GDA2020 data for storage and web publishing.
What Spatial Reference System does SLIP use?
WGS84 Web Mercator at epoch 1994.0 (EPSG:3857) for most services and GDA94 (EPSG:4283) for Imageserver services. Vector data uploaded to SLIP is converted, stored and published as WGS84 WM for web-mapping. Landgate imagery is stored by default as GDA94 and published as WGS84 WM, except for imageserver services which default to GDA94. See SLIP Web Services for more information.
What Spatial Reference System do SLIP online maps use?(Locate, LandInfo WA)
WGS84 Web Mercator (EPSG:3857) Current web-mapping services use WGS84 Web Mercator (WGS84WM) Coordinate Reference System (CRS - datum and projection). WGS84 has been popularised as a de-facto web-mapping standard by commercial providers and many online maps including Google, OpenStreetMap and Esri basemaps default to this CRS.
Can I use GDA2020 data with SLIP data?
Yes, but be mindful of combining data from multiple sources/datums into a single map. Both GDA94 and GDA2020 have a null transformation parameter to WGS84. Both being considered “equal” to WGS84. Users will need to select the appropriate Coordinate Reference System (CRS) and Transformation to align WGS84 WM services to GDA2020. For SLIP web services published as WGS84 WM (EPSG:3857) users should change layer CRS to GDA94 before specifying transformation to GDA2020.