[gdal-dev] Geodetic Problem

David Baker (Geoscience) david.m.baker at chk.com
Tue Mar 16 19:25:40 EDT 2010


Thanks for the info...


David M. Baker
Senior Geologist - Chief Technology Advisor
Chesapeake Energy Corporation
405-935-3715 office
405-496-5373 cell
david.m.baker at chk.com

-----Original Message-----
From: Aron Rubin [mailto:aronrubin at gmail.com]
Sent: Tuesday, March 16, 2010 4:14 PM
To: David Baker (Geoscience)
Cc: gdal-dev at lists.osgeo.org
Subject: Re: [gdal-dev] Geodetic Problem

On 3/16/10, David Baker (Geoscience) <david.m.baker at chk.com> wrote:
> Frank and the List,
> I have a geodetic problem I hope GDAL/OGR can solve.

I have not seen the direct or inverse gedesic routines in either Proj
or OGR. SimGear provides an implementation here
(function _geo_direct_wgs_84) and you could use OSRGetSemiMajor
OSRGetInvFlattening OSRGetSemiMinor for the "a", "rf", and "b"
variables respectively to use other ellipsoids assigned in OGR. Proj
wiki has notes here
<http://trac.osgeo.org/proj/wiki/GeodesicCalculations> which notes a
fortran implementation <http://www.ngs.noaa.gov/PC_PROD/Inv_Fwd/>.


Aron Rubin
Handy Husband & Daddy Jungle Gym & Senior Engineer

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