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<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>PS.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>Amro,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>speaking about grid shift files: <st1:City w:st="on">Dresden</st1:City>
is in <st1:place w:st="on">Saxony</st1:place>, right? I had a vague
recollection<br>
of other German grid shift files, and I have now managed to find one for you: the
grid <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>shift file for <st1:place w:st="on">Saxony</st1:place>,
SAETA2010.gsb, which you can get from here<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'> <a
href="http://www.landesvermessung.sachsen.de/inhalt/etrs/etrs.html">http://www.landesvermessung.sachsen.de/inhalt/etrs/etrs.html</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>Follow the link to “Gitterdateien für den
NTv2-Transformationsansatz”.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>The accuracy is claimed to be better than 4 cm. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>However, a problem could be that this grid shift file
transforms from the datum RD/83, not <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>from DHDN. EPSG writes about RD/83 (the long/lat
coordinate system, EPSG:4745): <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'> “Consistent with DHDN (CRS code 4314) at the
1-metre level. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'> For low accuracy applications RD/83 can be
considered the same as DHDN.”<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>And about the underlying datum, Rauenberg Datum/83, (EPSG:6745),
EPSG writes:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'> “RD/83 is the realisation of DHDN in <st1:place
w:st="on">Saxony</st1:place>. It is the resultant of applying <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'> a transformation derived at 106 points throughout
former <st1:place w:st="on"><st1:country-region w:st="on">East Germany</st1:country-region></st1:place>
to <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'> Pulkovo 1942/83 points in <st1:place w:st="on">Saxony</st1:place>.”<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>I must admit that I don’t see how these remarks
fit together. If RD/83 is <i><span style='font-style:italic'>the</span></i>
realisation of<br>
DHDN in <st1:place w:st="on">Saxony</st1:place>, I would expect that they
coincide exactly, rather than at the 1 meter level.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>But maybe someone else can explain this, or maybe you
can find an answer on <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>the <st1:place w:st="on">Saxony</st1:place> web site.
(I am not very good at reading German documentation.)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>Finally, I noticed that <st1:place w:st="on">Saxony</st1:place>
web site provides a free application, TRANS_SN (light), <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>which may be exactly what you need. It is probably
easier to use than Proj.4. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>Good luck!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>Mikael Rittri<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>Carmenta<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>Sweden<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>http://www.carmenta.com<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'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<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>Mikael Rittri<br>
<b><span style='font-weight:bold'>Sent:</span></b> den 8 maj 2012 16:34<br>
<b><span style='font-weight:bold'>To:</span></b> PROJ.4 and general Projections
Discussions<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Proj] Using EPSG
codes with cs2cs</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>Amro,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>Jose' is right, especially if you want agreement with
other data that have been transformed<br>
with those datum shift parameters. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>But you wrote:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt'>> My need here is to get as accurate as possible
results (cm-level if possible).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>Then, a better alternative could be to use the grid
shift file BETA2007.gsb. It is not distributed with Proj.4,<br>
but you can find a link at <a href="http://trac.osgeo.org/proj/">http://trac.osgeo.org/proj/</a>
under Download, Datum shift grids.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>If you download it to the directory where the other
grid shift files are in Proj.4 (the </span></font><font face="Courier New"><span
lang=EN-GB style='font-family:"Courier New"'>nad</span></font><font face=Arial><span
lang=EN-GB style='font-family:Arial'> directory),<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>then you can do <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Courier New"><span lang=EN-GB
style='font-size:12.0pt;font-family:"Courier New"'>>cs2cs +init=epsg:4326
+to +ellps=bessel +proj=tmerc +lon_0=12 +x_0=4500000 +nadgrids=BETA2007.gsb<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Courier New"><span lang=EN-GB
style='font-size:12.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Courier New"><span lang=EN-GB
style='font-size:12.0pt;font-family:"Courier New"'>13.755944 51.054555<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Courier New"><span lang=EN-GB
style='font-size:12.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Courier New"><span lang=EN-GB
style='font-size:12.0pt;font-family:"Courier New"'>4623220.44
5659181.52 0.00<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Courier New"><span lang=EN-GB
style='font-size:12.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>This result differs by about 1.7 meters from
Jose’s example. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>The BETA2007.gsb file is claimed to give submeter
accuracy, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>“eine Koordinatengenauigkeit im
Submeterbereich”. (But maybe it <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>is still possible that the 7-parameter transformation
you cite is more <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>accurate locally around <st1:place w:st="on"><st1:City
w:st="on">Dresden</st1:City></st1:place>.)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'>Best regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span lang=EN-GB style='font-size:
12.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>Mikael Rittri<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>Carmenta<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>Sweden<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>http://www.carmenta.com<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<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>Jose Gonçalves<br>
<b><span style='font-weight:bold'>Sent:</span></b> den 7 maj 2012 15:59<br>
<b><span style='font-weight:bold'>To:</span></b> PROJ.4 and general Projections
Discussions<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Proj] Using EPSG
codes with cs2cs</span></font><span lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>In addition to my
previous e-mail, since you have your own datum shift parameters it is better to
write the full proj string, instead of using an epsg predefinition. Your
rotation angles are in radians but cs2cs expects arc-seconds. They become 1.04,
0.35, -3.08.<br>
According to the map projection definition you give, the command line should be
something like:<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>cs2cs +init=epsg:4326 +to +ellps=bessel +proj=tmerc +lon_0=12
+x_0=4500000 +towgs84=582,105,414,1.040,0.350,-3.080,8.3<br>
13.755944 51.054555 <br>
4623218.81 5659181.06 -46.16<br>
<br>
Regards<br>
<br>
Jose' Gonçalves<br>
<br>
<br>
<br>
<br>
2012/5/7 Jose Gonçalves <<a href="mailto:jagoncal@gmail.com" target="_blank">jagoncal@gmail.com</a>><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hi<br>
<br>
Are you sure of EPSG code 31495? In my epsg file, installed with proj, I can
find only:<br>
<br>
epsg: 31461 # DHDN / 3-degree Gauss zone 1 (deprecated)<br>
epsg: 31462 # DHDN / 3-degree Gauss zone 2 (deprecated)<br>
epsg: 31463 # DHDN / 3-degree Gauss zone 3 (deprecated)<br>
epsg: 31464 # DHDN / 3-degree Gauss zone 4 (deprecated)<br>
epsg: 31465 # DHDN / 3-degree Gauss zone 5 (deprecated)<br>
epsg: 5520 # DHDN / 3-degree Gauss-Kruger zone 1<br>
epsg: 31466 # DHDN / 3-degree Gauss-Kruger zone 2<br>
epsg: 31467 # DHDN / 3-degree Gauss-Kruger zone 3<br>
epsg: 31468 # DHDN / 3-degree Gauss-Kruger zone 4<br>
epsg: 31469 # DHDN / 3-degree Gauss-Kruger zone 5<br>
<br>
If a projection ID is not in the file the expected answer is the one you got.
It is not a configuration problem.<br>
Check <a href="http://spatialreference.org" target="_blank">http://spatialreference.org</a>
to check the epsg code<br>
<br>
Regards<font color="#888888"><span style='color:#888888'><br>
<br>
<span class=hoenzb>Jose Gonçalves</span></span></font><o:p></o:p></span></font></p>
<div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'><br>
<br>
<br>
<br>
<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>2012/5/7 rps_rt <<a href="mailto:ec_eng01@yahoo.com" target="_blank">ec_eng01@yahoo.com</a>><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Dear Warmerdam and all members,<br>
<br>
I have been browsing and reading for a while to convert my coordinates with<br>
no hope until finding this Proj. 4.<br>
<br>
Kindly, I seek your support here ... I am using Linux Ubuntu to convert from<br>
long/lat (WGS84) to Cartesian (x/y) and vice versa. My need here is to get<br>
as accurate as possible results (cm-level if possible).<br>
<br>
I was reading this thread because I had a problem of getting a cs2cs results<br>
for espg=31495, while I could get them for espg=31468. But the conversion<br>
results with the later one were not accurate ~ almost 100 meters away.<br>
<br>
e.g.,: echo "13.755944 51.054555" | cs2cs +init=epsg:4326 +to<br>
+init=epsg:31468<br>
<br>
but when I change it to: echo "13.755944 51.054555" | cs2cs
+init=epsg:4326<br>
+to +init=epsg:31495,<br>
I get the message "projection initialization failure cause: no options
found<br>
in 'init' file".<br>
<br>
I tried to change something based on this thread, to make sure that my<br>
PROJ_LIB path is in place, but it seems I ruined everything. Afterwards, all<br>
espg zones gave the below error:<br>
"<br>
pj_open_lib(epsg): call fopen(/usr/local/bin/cs2cs/epsg) - failed<br>
Using from definition: init=epsg:31467<br>
Rel. 4.8.0, 6 March 2012<br>
<cs2cs>:<br>
projection initialization cause: no system list, errno: 20<br>
"<br>
<br>
I tried to "make uninstall" and "make install" but nothing
was fixed!!<br>
<br>
Here are more details about my project:<br>
<br>
My locations are in Dresden city, Germany, (DHDN4), and I have (I assume)<br>
all what is needed to get my coordinates converted accurately, but no idea<br>
how to process them in Proj. 4 (I am totally new here):<br>
<br>
PROJCS["DHDN / Germany zone<br>
4",GEOGCS["DHDN",DATUM["Deutsche_Hauptdreiecksnetz",<br>
SPHEROID["Bessel
1841",6377397.155,299.1528128]],PRIMEM["Greenwich",0],<br>
UNIT["degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],<br>
PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",12],<br>
PARAMETER["scale_factor",1],PARAMETER["false_easting",4500000],<br>
PARAMETER["false_northing",0],UNIT["metre",1]]<br>
TOWGS84=582.0,105.0,414.0,5.042e-6,1.696e-6,-1.4932e-5,8.3<br>
EPSG=31495<br>
<br>
%Seven parameters:<br>
% 582.00 - Translation dx in meter to WGS84<br>
% 105.0 - Translation dy in meter to WGS84<br>
% 414.50 - Translation dz in meter to WGS84<br>
% 5.042e-6 - Rotation ro (omega) in Radiant to WGS84<br>
% 1.696e-6 - Rotation rf (phi) in radiant to WGS84<br>
% -1.4932e-5 - Rotation rk (Kappa) in Radiant to WGS84<br>
% 8.3e-06 - Mapscale factor in ppm (parts per million) to WGS84(m)<br>
<br>
Sorry for the long thread but did not want to miss any details, even in my<br>
first ever thread in this forum.<br>
<br>
I will be looking forward to reading form you.<br>
Best regards,<br>
Amro<br>
<br>
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