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.).
Below are Nearmap's coordinate system specifications:
|Please note the spatial accuracy of Nearmap imagery may be at a lower quality when using projections not listed in this document.|
NAD83 realization is "NAD83(2011) 2010.0 epoch"
****Use NAD83 / UTM Zones when using state plane systems. See UTM Zone chart below: