To Nathanial, I am the original author of the NADCONTransform. I do not have much time for geotools, but I am still around.
Looking at the code, it is throwing the exception when it is checking if the point to transform is within the conus grid (as you probably guessed). I can't really say what is wrong until you give me some sample coordinates (preferably in EPGS:4957 (which I assume is NAD 83, I don't have time to look it up tonight)), but EPSG:2229 (state plane) would also work. The transformation procedure you described (state plane projected CRS --> NAD 83 geographic CRS --> NAD 27 geographic CRS) is correct. Note that to transform from NAD 83 to NAD 27 you will need to use the inverse transform. Using the forward transform instead would give you the wrong answer, but is unlikely to give you a "point outside grid" exception. If you can provide me with some test coordinates (and their CRS) I will see what I can do. Rueben Schulz On Fri, 2008-18-07 at 07:31 -0700, Jody Garnett wrote: > Hi Nathanial; there is a source forge users list for questions. We don't > use the codehaus list; although I have not figure out how to shut it off. > Jody > > nathanial wrote: > > I have some coordinates in the state plane system, using the NAD83 datum, > > and > > I'd like to convert them to NAD27 using the NADCONTransform class. I've > > tried having geotools convert them into geographical coordinates (from > > lambert conic) but the NADCONTransform class keeps telling me that my points > > are not on the grid. > > > > I'm starting from EPSG:2229 and converting to EPSG:4957 before passing my > > points off to the NADCONTransform, using conus.las/los for my grid. Is there > > something else I should be doing? Does anyone know how the NADCONTransform > > class is properly used? > > > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Geotools-gt2-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Geotools-gt2-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
