[gpl_list] Inclusion of NGS GEOCON & GEOCON11 transformation grids into ArcGIS

[Brady Callahan]

For those who didn't make it, Michael Dennis from the NGS put on a nice workshop yesterday on GPS & Geodesy. He presented a nice run through on a variety of topics, once the slides are available I'll pass them on.

A particular nugget that I found interesting is that the NGS has finally put together some transformation tools to move positions from HARN to  NAD83(NSRS2007) i.e. CORS96 and then to NAD83(2011). These tools are called GEOCON and I haven't had the chance to look them over yet. However, I did send a note to Melita Kennedy (the Coordinate System guru at ESRI) about them. Her response was that ESRI didn't find out about them in time for inclusion into ArcGIS 10.2. She said the format is also slightly different than the bilinear grids from NADCON and so inclusion is not as straightforward and given the current BETA state of the GEOCON tools she thought it prudent to wait a bit longer. 

This is potentially exciting news for folks that work with high precision data (lidar, GPS, etc) as moving between reference frames will finally be possible. 

~Brady


Brady Callahan, GISP
GIS Program Leader
Oregon Parks & Recreation
725 Summer St NE, Ste C
Salem, OR 97301
brady.callahan at state.or.us

ph. 503-986-0783
fax. 503-986-0792
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