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

[Landon Blake]

I'd be careful using something like Corpscon for data that is sub-foot
accuracy and needs to stay that way.

We wouldn't use that program or any like it to convert data that needs
to be that accurate. I don't know what the purpose of Aaron's data
conversion is, but he might need to be careful.

Transforming the location of gopher holes using Corpscon is one thing.
Transforming building corner positions, or the alignment of a new
pipeline with Corpscon is another thing entirely.

Landon
Office Phone Number: (209) 946-0268
Cell Phone Number: (209) 992-0658
 
 

-----Original Message-----
From: proj-bounces at lists.maptools.org
[mailto:proj-bounces at lists.maptools.org] On Behalf Of Richard Greenwood
Sent: Thursday, February 19, 2009 10:42 AM
To: PROJ.4 and general Projections Discussions
Subject: Re: [Proj] How to transform between NAD83 HARN/HPGN and WGS84

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

Regards,
Rich

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
www.greenwoodmap.com
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