teknomatika Posted October 6, 2012 Share Posted October 6, 2012 Someone has a routine that allows convert geographic coordinates system used by Google Earth, WGS-84, for the European system ETRS 89? The ideal will be able to read data from a file and convert a geographic coordinate and draw points converted and coordinated. However, since the simple conversion would be a great help. I intended to use the format shown in the attached image I appreciate the help from the masters. Quote Link to comment Share on other sites More sharing options...
Tyke Posted October 7, 2012 Share Posted October 7, 2012 That's a bit heavy for a LISP routine. There's a lot of maths behind such a conversion because it is not a straight forward move and rotate but also stretching too. You are transforming from one geoid to another. OK you have no heights but they would normally also be transformed. If you had a version of Civil 3D (2010 or newer) it an in built conversion. Otherwise if you only have a coordinate file you could look at any of the commercial programs for doing the transformation. Quote Link to comment Share on other sites More sharing options...
teknomatika Posted October 8, 2012 Author Share Posted October 8, 2012 That's a bit heavy for a LISP routine. There's a lot of maths behind such a conversion because it is not a straight forward move and rotate but also stretching too. You are transforming from one geoid to another. OK you have no heights but they would normally also be transformed. If you had a version of Civil 3D (2010 or newer) it an in built conversion. Otherwise if you only have a coordinate file you could look at any of the commercial programs for doing the transformation. I appreciate the attention. Had in mind that would be less complex and that would be enough to apply some conversion factor. Of course the simple coordinate conversion, without reading the file, it would be great, but so have to turn me into another alternative. Thank you. Quote Link to comment Share on other sites More sharing options...
ReMark Posted October 8, 2012 Share Posted October 8, 2012 "The WGS84/ITRS GPS coordinates are converted to ETRS89 with their given epoch's parameter set. For an exact calculation, it is therefore necessary to know the epoch, that is, the year the GPS data was implemented. These realizations are issued using the year in the form of ITRS89 for the year 1989, successively up to ITRS12 for the year 2012 and annually ongoing." Source: Killet Soft See their program called TRANSDAT. http://www.killetsoft.de/t_1009_e.htm Quote Link to comment Share on other sites More sharing options...
Tyke Posted October 8, 2012 Share Posted October 8, 2012 "The WGS84/ITRS GPS coordinates are converted to ETRS89 with their given epoch's parameter set. For an exact calculation, it is therefore necessary to know the epoch, that is, the year the GPS data was implemented. These realizations are issued using the year in the form of ITRS89 for the year 1989, successively up to ITRS12 for the year 2012 and annually ongoing." Source: Killet Soft See their program called TRANSDAT. http://www.killetsoft.de/t_1009_e.htm Your dead on there ReMark. We use their software daily and the program TRANSDAT is very good. It only does coordinate file transformations, at least our version does, but you still need to know the values of the seven parameters to do a standard RD83 ETRS89 transformation. I must admit that we haver never tried WGS84 ETRS89, as we have never had the need. Quote Link to comment Share on other sites More sharing options...
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