Changeset 4965 in ntrip


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Timestamp:
Feb 28, 2013, 12:00:18 PM (9 years ago)
Author:
weber
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  • trunk/BNC/src/bnchelp.html

    r4964 r4965  
    20282028</p>
    20292029<p>
    2030 From a theoretical point of view this kind of approximation leads to inconsistencies between orbits and clocks and is therefore not allowed. However, it has been proved that resulting errors in Precise Point Positioning are on millimeter level for horizontal components and below the one centimeter for height components.
     2030From a theoretical point of view this kind of approximation leads to inconsistencies between orbits and clocks and is therefore not allowed. However, it has been proved that resulting errors in Precise Point Positioning are on millimeter level for horizontal components and below the one centimeter for height components. The Australian GDA94 transformation with its comparatively large scale parameter is an exception in this as descrepancies may reach up to two centimeters.
    20312031</p>
    20322032
     
    20362036
    20372037<p>
    2038 <u>ETRF2000:</u> The formulas for the transformation 'ITRF2005-&gt;ETRF2000' are taken from 'Claude Boucher and Zuheir Altamimi 2008: Specifications for reference frame fixing in the analysis of EUREF GPS campaign', see <u>http://etrs89.ensg.ign.fr/memo-V8.pdf</u>. The following 14 Helmert Transformation Parameters were introduced:
     2038<u>ETRF2000:</u> The formulas for the transformation 'ITRF2008-&gt;ETRF2000' are taken from 'Claude Boucher and Zuheir Altamimi 2008: Specifications for reference frame fixing in the analysis of EUREF GPS campaign', see <u>http://etrs89.ensg.ign.fr/memo-V8.pdf</u>. The following 14 Helmert Transformation Parameters were introduced:
    20392039</p>
    20402040<p>
     
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    20832083<p>
    2084 <u>GDA94:</u> The formulas for the transformation 'ITRF2000-&gt;GDA94' are taken from 'John Dawson, Alex Woods 2010: ITRF to GDA94 coordinate transformations', Journal of Applied Geodesy, 4 (2010), 189¿199, de Gruyter 2010. DOI 10.1515/JAG.2010.019'.
     2084<u>GDA94:</u> The formulas for the transformation 'ITRF2008-&gt;GDA94' are taken from 'John Dawson, Alex Woods 2010: ITRF to GDA94 coordinate transformations', Journal of Applied Geodesy, 4 (2010), 189-199, de Gruyter 2010. DOI 10.1515/JAG.2010.019'.
    20852085</p>
    20862086<p>
     
    21052105
    21062106<p>
    2107 <u>SIRGAS2000:</u> The formulas for the transformation 'ITRF2005-&gt;SIRGAS2000' were provided via personal communication from CGED-Coordenacao de Geodesia, IBGE/DGC - Diretoria de Geociencias, Brazil.</u>.
     2107<u>SIRGAS2000:</u> The formulas for the transformation 'ITRF2008-&gt;SIRGAS2000' were provided via personal communication from CGED-Coordenacao de Geodesia, IBGE/DGC - Diretoria de Geociencias, Brazil.</u>.
    21082108</p>
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    2153 <u>Custom:</u> The default numbers shown as examples are those for a transformation from ITRF2005 to ETRF2000'.
     2153<u>Custom:</u> Feel free to specify your own 14 Helmert Transformation parameters for transformations from IGS08/ITRF2008 into your own target system.
    21542154</p>
    21552155
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