Feature request #8954

Updated by Nyall Dawson over 3 years ago

*New description:*



introduction:



The CRSs with code 102160/102161/102164/102165 (originally from ESRI) are widely used in Portugal (even if now superseded by 3763).



102161 is identical to EPSG 27493



102164/102165 are the same as EPSG 20790/20791 even if the definitions is slightly different.



102160 does not seems to have an equivalent EPSG CRS.



27493/20790/20791 are shipped in QGIS with TOWGS84 parameters, this is very good because they allow to transform/reproject layers with a much needed precision.



The suggestion is to modify the 102160/102161/102164/102165 CRSs by adding the very same TOWGS84 parameters:



for 102160/1



+towgs84=-223.237,110.193,36.649,0,0,0,0



and for 102164/102165



+towgs84=-304.046,-60.576,103.64,0,0,0,0



*Old Description:*



The following ESRI-based CRSs are lacking DATUM transformation parameters (ToWGS84):

Lisboa_Hayford_Gauss_IGeoE

Lisboa_Hayford_Gauss_IPCC

Datum_73_Hayford_Gauss_IGeoE

Datum_73_Hayford_Gauss_IPCC



The trnasformation parameters for these CRSs can be found, for example, in ArcPAD 7 system files, as the one attached.

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