I'm new to learning GIS and ArcMap, but have some confusion about coordinate systems. I thought I understood that there are two main types of coordinate systems, Projected Coordinate Systems which are in feet or meters, or Geographic Coordinate Systems in lat/long units.
Working on a project in ArcMap I see that in the Layer Properties, it shows the coordinates systems as a projected system, NAD_83 and also a geographic system, GCS North America 1983 (The block below is a cut and paste from "Layer Properties").
I thought that the coordinate systems were supposed to be mutually exclusive? Does it make sense that a feature set would be in a projected and geographic system at the same time?? Or does it mean that NAD83 based on GCS North American 1983? Would it be possible to use NAD83 and a differentGCS?
My understanding is that NAD_1983_StatePlane_California_V_FIPS_0405_Feet measures everything in Meters from 34'N and 118'W, so how can it work with GCS that references the Greenwich prime meridian in lat/long?
Projected Coordinate System: NAD_1983_StatePlane_California_V_FIPS_0405_Feet Projection: Lambert_Conformal_Conic False_Easting: 6561666.66666667 False_Northing: 1640416.66666667 Central_Meridian: -118.00000000 Standard_Parallel_1: 34.03333333 Standard_Parallel_2: 35.46666667 Latitude_Of_Origin: 33.50000000 Linear Unit: Foot_US Geographic Coordinate System: GCS_North_American_1983 Datum: D_North_American_1983 Prime Meridian: Greenwich Angular Unit: Degree