[Proj] How to transform between NAD83 HARN/HPGN and WGS84

support.mn at elisanet.fi support.mn at elisanet.fi
Thu Feb 19 21:59:23 EST 2009


normal datums usually give you an accuracy of some meters best. If you want to get to sub feet accuracy you usually have to adjust your maps additional to that.

regards: Janne.


Aaron Friesen [aaron at cartopac.com] kirjoitti: 
> Everyone,
> I checked the archives for the past year and did not find an
> answer to this.  Google did not provide me with any leads
> either.
> I have data in NAD83 HARN for Colorado.  I need to take the
> data into the field as WGS84, update it/add to it, and get
> it back as NAD83 HARN for Colorado.  The data I am collecting
> has sub-foot accuracy, so "close" is not good enough.
> The information on the grid files does not address the
> HARN/HPGN question.
> Is this type of transformation with the accuracy I need
> possible with Proj?
> Are HARN grid files available or are towgs84 settings defined
> for the various HARN areas?
> Or am I stuck looking for an alternative, commercial solution?
> Thank for your assistance.
> Aaron
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