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Datum transformation from NAD83 to NWS84

SantoshChandru

What transformation method will be best suited to convert the datum from NAD83 to NWS84?

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BeatrizSánchez

Hello,

I just would like to know if this process is also right for the transformation ED50 to Sphere Emep.

Thank you

RocíoVega

Thanks Melita!!

MelitaKennedy

No, I am looking for transformation from NAD1983 to NWS84 (Radius 6370 km spheroid).

Ah, I haven't heard of NWS84. There are no transformations from a geodetic datum-based geographic coordinate system to a sphere-based geographic coordinate system.

We do have a GCS already built with a radius of 6370000 m. It's called "Sphere EMEP".

There's a geoprocessing / ArcToolbox tool called Create Custom Geographic Transformation. Use NAD 1983 for the input/from and Sphere EMEP for the output/to. For the method, if you have version 10, use Null. If you have 9.3.1, use Longitude_Rotation.

If you do the conversion and the data is offset strictly north-south by kilometers, define a second transformation. This time use Geocentric_Translation for the method and leave the parameter values set to zeroes, and see if that works better.

Melita

SantoshChandru

Do you mean WGS84 also known as WGS 1984? Try NAD_1983_To_WGS_1984_5. If the data is in the lower 48 states (except maybe the west coast states) and accuracy is a meter or more, try NAD_1983_To_WGS_1984.

Regards,
Melita

No, I am looking for transformation from NAD1983 to NWS84 (Radius 6370 km spheroid).

MelitaKennedy

What transformation method will be best suited to convert the datum from NAD83 to NWS84?

Do you mean WGS84 also known as WGS 1984? Try NAD_1983_To_WGS_1984_5. If the data is in the lower 48 states (except maybe the west coast states) and accuracy is a meter or more, try NAD_1983_To_WGS_1984.

Regards,
Melita

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