[Proj] NGS Control Points

Richard Greenwood richard.greenwood at gmail.com
Thu Jun 23 21:22:16 EST 2011

On Thu, Jun 23, 2011 at 8:45 AM, Eric Miller <EMiller at dfg.ca.gov> wrote:
>>>> On 6/22/2011 at 7:14 PM, Richard Greenwood <richard.greenwood at gmail.com>
> wrote:
>> Following up on my original reply to the original question - I
>> attempted to transform the point from NAD83 to NAD27 with NADCON
>> (actually I used CORPSCON) and it refused to process the
>> transformation because it was outside the conus grid shift files,
>> which are the only datum shift files that I have.
> That's interesting. The transform seems to work fine with the online NADCON tool.  And, considering that the position is on land in the city of San Francisco it should!

My bad. I had entered the longitude as -122.39812240 (negative), but
122.39812240 (positive) works. CORPSCON is rather provincial.
Apologies for the confusion.


Richard Greenwood
richard.greenwood at gmail.com

More information about the Proj mailing list