Coordinate Systems
Geolocarta data supports multiple coordinate reference systems (CRS) to suit different workflows.
Default CRS
All API responses default to WGS 84 (EPSG:4326) — the global standard used by GPS and most web mapping libraries.
Australian CRS Options
For surveying and engineering work, request data in Australian-specific coordinate systems:
| CRS | EPSG | Best For |
|---|---|---|
| GDA2020 | 7844 | National standard, replacing GDA94 |
| GDA2020 / MGA Zone 54 | 7854 | Western Australia (east) |
| GDA2020 / MGA Zone 55 | 7855 | South Australia, Victoria |
| GDA2020 / MGA Zone 56 | 7856 | NSW, Queensland (south) |
| GDA2020 / MGA Zone 57 | 7857 | Queensland (north) |
Specifying CRS in API Requests
# Request cadastral data in GDA2020
curl -H "Authorization: Bearer YOUR_API_KEY" \
"https://api.geolocarta.com/v1/cadastral?lat=-27.47&lng=153.02&crs=EPSG:7844"
CRS Transformation
The API can transform coordinates on the fly. Specify both input and output CRS:
curl -H "Authorization: Bearer YOUR_API_KEY" \
"https://api.geolocarta.com/v1/transform?x=153.02&y=-27.47&from=EPSG:4326&to=EPSG:7856"
GDA94 to GDA2020
Australia transitioned from GDA94 to GDA2020 in 2020. Geolocarta supports both, but we recommend using GDA2020 for new projects. The difference is approximately 1.8 metres.
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