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<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt;font-family:Arial;color:navy">A problem with using HARN/HPGN is that the grid files overlap each other,
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt;font-family:Arial;color:navy">but they don’t agree with each other in the common areas. I don’t know what
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt;font-family:Arial;color:navy">the best practice is, but this and similar problems are discussed here:
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt;font-family:Arial;color:navy"><a href="http://trac.osgeo.org/csmap/wiki/CsMapRfc7">http://trac.osgeo.org/csmap/wiki/CsMapRfc7</a><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt;font-family:Arial;color:navy">Best regards,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Mikael Rittri<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Carmenta<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Sweden<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-US" style="font-size:10.0pt;font-family:Arial;color:navy"><a href="http://www.carmenta.com/"><span lang="SV">http://www.carmenta.com</span></a></span></font><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;
color:navy"><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt;font-family:Tahoma;font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span lang="EN-US" style="font-size:10.0pt;font-family:Tahoma"> proj-bounces@lists.maptools.org
[mailto:proj-bounces@lists.maptools.org] <b><span style="font-weight:bold">On Behalf Of
</span></b>Richard Greenwood<br>
<b><span style="font-weight:bold">Sent:</span></b> Wednesday, March 18, 2015 3:18 PM<br>
<b><span style="font-weight:bold">To:</span></b> <st1:PersonName w:st="on">PROJ.4 and general Projections Discussions</st1:PersonName><br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [Proj] why doesn't the epsg file reference the hpgn grids?</span></font><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"> be used.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt">On Tue, Mar 17, 2015 at 9:32 PM, Hermann Peifer <<a href="mailto:peifer@gmx.eu" target="_blank">peifer@gmx.eu</a>> wrote:<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><br>
I did anyway some time ago was to add my own lookup table as<br>
local/share/proj/hermann in order to gain control over my own<br>
transformations.<br>
<br>
Now I can use: +init=hermann:4314, which resolves to my transformation<br>
parameters (+proj=longlat +ellps=bessel +nadgrids=BETA2007.gsb), whereas<br>
epsg:4314 translates to: +proj=longlat +datum=potsdam +no_defs<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Hermann, thank you for the suggestion. I'm doing the same thing (creating my own lookup file) which of course works fine for me, but doesn't
help anyone else. I believe that there are about 600 coordinate systems in the Proj4 epsg file that say "HARN" but do actually reference the HARN grid shift files, nor give the user any obvious clues that these grid files are available and could, and should,
be used.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt">Thanks,<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt">Rich<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><br>
<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt">--
<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt">Richard W. Greenwood, PLS<br>
<a href="http://www.greenwoodmap.com" target="_blank">www.greenwoodmap.com</a><o:p></o:p></span></font></p>
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