<div dir="ltr"><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Am Fr., 14. Feb. 2020 um 11:18 Uhr schrieb Colin Smale <<a href="mailto:colin.smale@xs4all.nl">colin.smale@xs4all.nl</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="font-size:10pt;font-family:Verdana,Geneva,sans-serif">Yes I realise that but attention must be paid to all possible sources of precision leakage.<div dir="ltr">
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<div>What use would proprietary parameters be? If they were used, are relevant and kept private, this would impede the consumption of the data by any clients. All GIS files must include, by value or by reference, the relevant CRS, otherwise the contents can not be interpreted properly, can they? Or are you thinking of the situation in China where they have a state-controlled/licenced transformation?</div>
<div> </div></div></div></blockquote></div><div><br></div><div><br></div><div>First, proprietary parameters does not mean you cannot have access to them, but you might have to pay for it. Secondly, you do not need the parameters for use of the data in a certain CRS but you need them for high precision conversions into another CRS.</div><div><br></div><div>Cheers</div><div>Martin<br></div></div>