Hello,

I have a set of well points (provided by DOGGR) initially stored in an table with lat/longs. I created points assuming that the coordinate system was GCS_WGS_1984 with a D_WGS_1984 datum. Another person did the exact same thing several years ago, but they assumed Geographic Coordinate System for the coordinate system, WGS1984 datum.

I have loaded both shapefiles into an MXD with the data frame set to NAD_1983_UTM_Zone_11N and they don't match (they should, exact same points except the newer one has a few more). They are offset by about 70 meters on the x and 15 meters on the y.

My questions:

What is the difference between this:

Geographic Coordinate System: GCS_WGS_1984

Datum: D_WGS_1984

Prime Meridian: Greenwich

Angular Unit: Degree

And this:

Geographic Coordinate System: Geographic Coordinate System

Datum: WGS84

Prime Meridian: Greenwich

Angular Unit: degree

Any clues?

Thanks in advance.

I have a set of well points (provided by DOGGR) initially stored in an table with lat/longs. I created points assuming that the coordinate system was GCS_WGS_1984 with a D_WGS_1984 datum. Another person did the exact same thing several years ago, but they assumed Geographic Coordinate System for the coordinate system, WGS1984 datum.

I have loaded both shapefiles into an MXD with the data frame set to NAD_1983_UTM_Zone_11N and they don't match (they should, exact same points except the newer one has a few more). They are offset by about 70 meters on the x and 15 meters on the y.

My questions:

What is the difference between this:

Geographic Coordinate System: GCS_WGS_1984

Datum: D_WGS_1984

Prime Meridian: Greenwich

Angular Unit: Degree

And this:

Geographic Coordinate System: Geographic Coordinate System

Datum: WGS84

Prime Meridian: Greenwich

Angular Unit: degree

Any clues?

Thanks in advance.

Hi,

When we compare coordinate systems for equality, we check everything, including any names. These two aren't considered equal. They're pretty far off though. Even if you had a NAD83/WGS84 transformation set, I wouldn't expect them to be offset that much.

Melita