Comments (6)
Thanks for reporting this @mrjose
from phpcoord.
Further to this, the MyGeodata Cloud website is generating better results: https://mygeodata.cloud/cs2cs/
This is a conversion from TM75 Irish Grid to WGS84. The output in this case:
lat: 53.2707817373
lng: -6.16661198943
from phpcoord.
Interesting...
The main reason for the discrepency appears to be the values converting Irish Grid to WGS84 I took from an OSI document here: https://www.osi.ie/wp-content/uploads/2015/07/Survey-Ireland-1999-Making-Maps-Compatible-with-GPS.pdf?ext=.pdf
If you look at slide 28, the 3 rotation parameters are expressed as positive numbers (they even include the +
).
If you look at the params from MyGeoData
, they are negative versions of the same numbers. When I flip the signs on MyGeoData
and also adjust the other params to be the 3dp rather than 1dp versions, the numbers are basically the same.
from phpcoord.
So question is which way around are the rotations supposed to be - does the official document I've used as source have a mistake?
from phpcoord.
Fix coming up shortly
from phpcoord.
Thanks @dvdoug the update appears to have worked a treat!
from phpcoord.
Related Issues (20)
- ITM to WGS84 error
- Library upgrade assistance HOT 3
- Uncaught Error: Class 'PHPCoord\CoordinateReferenceSystem\Projected' not found HOT 4
- Lat/long from eastings & northings v4 HOT 6
- License requirments of the EPSG dataset HOT 4
- I experience a memory leak HOT 2
- Accuracy of EPSG_AMERSFOORT_RD_NEW ⇒ EPSG_WGS_84 conversion HOT 23
- Division by zero HOT 2
- EPSG_AMERSFOORT_RD_NEW ⇒ EPSG_WGS_84 conversion no longer working HOT 6
- Can not convert from epsg:7415 to epsg:4979 HOT 2
- Retrieving Coordinate Systems to Display HOT 1
- deprecation warning php 8: Optional parameter ... declared before required parameter HOT 4
- Determine Point Type from CRS HOT 1
- Convert WGS 84 Coordinates to DHDN / 3-degree Gauss-Kruger zone 4 HOT 2
- Unable to perform conversion HOT 2
- Irish Grid error with valid coordinates HOT 3
- UnknownConversionException with ETRS89_TM35FIN_N_E HOT 5
- Failure to calculate long distances with vicenty HOT 2
- Possible rounding error when converting Geographic2D::EPSG_IRENET95 to Projected::EPSG_TM75_IRISH_GRID HOT 5
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from phpcoord.