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

Richard Greenwood richard.greenwood at gmail.com
Thu Feb 19 13:42:01 EST 2009

Corpscon (http://crunch.tec.army.mil/software/corpscon/corpscon.html)
based on NADCON is a good, free, authoritative tool when working in
the US.


On Thu, Feb 19, 2009 at 10:20 AM, Aaron Friesen <aaron at cartopac.com> wrote:
> 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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Richard Greenwood
richard.greenwood at gmail.com

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