A coordinate system consists of datum and a projection. A datum is a system for applying a grid to the surface of the Earth using a reference or measurements. There are many different ways to place this grid on the earth, which formulate all the different types of datums. A map projection uses the datum as a point of reference to represent a spherical or curved surface on a flat plane.
There are a few types of coordinate systems, but commonly utilized are Geographic coordinate systems and Projected coordinate systems. Geographic coordinate systems are based on a spheroid and use angular units of measure (degrees). A Projected coordinate system is based on a spheroid projected onto a flat 2D surface and utilize linear units (meters, feet..ect.) Projected coordinate systems tend to be more commonly used (State planes, UTM, etc.).
Coordinate system specifications
Below are Nearmap's coordinate system specifications:
NOTE: The spatial accuracy of Nearmap imagery may be at a lower quality when using projections not listed in this document.
World-wide:
- EPSG:4326 - WGS 84 / Geodetic
- EPSG:3785 - aka EPSG:3857 - WGS 84 / World Mercator
Australia
- EPSG:4283 - GDA 94 / Geodetic
- SR-ORG:7400 Perth Coastal Grid 1994
- EPSG:28349 to EPSG:28356 - GDA 94 / MGA zone #
EPSG:7849 to EPSG:7856 - GDA 2020 / MGA zone # - EPSG:3107 GDA94 / SA Lambert
New Zealand
- WGS 84 / Spherical Mercator
- WGS 84 / UTM zone 60S
- NZGD2000 / UTM zone 60S
- NZGD2000 / New Zealand Transverse Mercator 2000
- New Zealand Continental Shelf Lambert Conformal 2000 (NZCS2000)
North America
NAD83 realization is "NAD83(2011) 2010.0 epoch"
****Use NAD83 / UTM Zones when using state plane systems. See UTM Zone chart below:
Supported projections
Attached below is TXT file with a list of supported projections for offline deliveries. Click on the link below to download the file.
