Helmert transformation #3
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added 10 commits
October 9, 2012 22:27
* converts from cartesian to polar based on Airy 1830 * need to handle different ellipsoids
* transform caresian to polar co-ords * clean up code of helmert a lot * by combining output can transform between datums * -1 error with height * next step is to move these php functuons to C functions and create convert datum PHP function and wrappers
* more tests
* more comments
* add test for decimal minutes * add test on prime meridian based on this photo http://upload.wikimedia.org/wikipedia/commons/a/a1/Garmin_GPS_at_Greenwich_Observatory.jpg
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Any view or comment on this? I have gone further on a separate branch and started to add an object orientated API which uses the same functions it is nicer to use. |
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Sorry, I'll try and get that merged today. Sent from my Commodore 64 On 2 Jan 2013, at 09:28, Nathaniel McHugh notifications@github.com wrote:
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I'll merge this, though there's some differences in the output on my machine (down at the very last decimal point). I'll maybe truncate the results somewhat so the very small differences don't show. |
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Using my rudimentary knowledge of C I have implemented the helmert transformation and some other functions to make it useful.
This may be completely the wrong way to do it and I am happy to change any of it but just thought it would be good to get the functions in there.
I based the calculations on the spreadsheet www.ordnancesurvey.co.uk/oswebsite/gps/docs/ProjectionandTransformationCalculations.xls which seemed to be a pretty accurate source.