[MetaCRS] Datum Transformation Issues

[Nick Fordes]

Yes -

I am hoping to achieve a sub-meter transformation between the two datums.
Also - we would ideally like to go from ITRF 2008 to Is Proj4js an
appropriate tool to do this?  Can it handle a grid shift transform?

Thanks,

Nick

On Wed, Feb 22, 2017 at 1:02 PM Richard Greenwood <
richard.greenwood at gmail.com> wrote:

> On Wed, Feb 22, 2017 at 10:26 AM, Nick Fordes <nick.fordes at locusview.com>
> wrote:
>
> Hi -
>
> I am using the Proj4js library and am having trouble successfully
> transforming coordindates from ITRF 2008 (EPSG:5332) to NAD83 (2011)
> (EPSG:6317).
>
>
> Are you getting an error or incorrect results? The espg definitions for
> 5332 and 6317 are the same (see below) but that's not to say they are
> correct.
>
> # ITRF2008 <5332> +proj=geocent +ellps=GRS80 +units=m +no_defs  <>
> # NAD83(2011) <6317> +proj=geocent +ellps=GRS80 +units=m +no_defs  <>
>
>
> I have bee successful in entering coordinates into the following tool and
> generating results for going from WGS83 (EPSG4326) to NAD83 (2011)
> (EPSG:6317), however, there is no transformation applied.
>
>
> "NAD" datums are tied to the North American continental plate, "WGS"
> datums are tied to the center of the earth. To get meter or sub-meter
> accuracy transformations you need to use a grid shift transform. Is that
> what you're looking for when you say that no transformation is applied?
>
>
>
>
> --
> Richard W. Greenwood, PLS
> www.greenwoodmap.com
>
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