[Proj] Using EPSG codes with cs2cs

[Jose Gonçalves]

Hi

Are you sure of EPSG code 31495? In my epsg file, installed with proj, I
can find only:

epsg: 31461    # DHDN / 3-degree Gauss zone 1 (deprecated)
epsg: 31462    # DHDN / 3-degree Gauss zone 2 (deprecated)
epsg: 31463    # DHDN / 3-degree Gauss zone 3 (deprecated)
epsg: 31464    # DHDN / 3-degree Gauss zone 4 (deprecated)
epsg: 31465    # DHDN / 3-degree Gauss zone 5 (deprecated)
epsg: 5520      # DHDN / 3-degree Gauss-Kruger zone 1
epsg: 31466    # DHDN / 3-degree Gauss-Kruger zone 2
epsg: 31467    # DHDN / 3-degree Gauss-Kruger zone 3
epsg: 31468    # DHDN / 3-degree Gauss-Kruger zone 4
epsg: 31469    # DHDN / 3-degree Gauss-Kruger zone 5

If a projection ID is not in the file the expected answer is the one you
got. It is not a configuration problem.
Check http://spatialreference.org to check the epsg code

Regards

Jose Gonçalves





2012/5/7 rps_rt <ec_eng01 at yahoo.com>

> Dear Warmerdam and all members,
>
> I have been browsing and reading for a while to convert my coordinates with
> no hope until finding this Proj. 4.
>
> Kindly, I seek your support here ... I am using Linux Ubuntu to convert
> from
> long/lat (WGS84) to Cartesian (x/y) and vice versa. My need here is to get
> as accurate as possible results (cm-level if possible).
>
> I was reading this thread because I had a problem of getting a cs2cs
> results
> for espg=31495, while I could get them for espg=31468. But the conversion
> results with the later one were not accurate ~ almost 100 meters away.
>
> e.g.,: echo "13.755944 51.054555" | cs2cs +init=epsg:4326 +to
> +init=epsg:31468
>
> but when I change it to: echo "13.755944 51.054555" | cs2cs +init=epsg:4326
> +to +init=epsg:31495,
> I get the message "projection initialization failure cause: no options
> found
> in 'init' file".
>
> I tried to change something based on this thread, to make sure that my
> PROJ_LIB path is in place, but it seems I ruined everything. Afterwards,
> all
> espg zones gave the below error:
> "
> pj_open_lib(epsg): call fopen(/usr/local/bin/cs2cs/epsg) - failed
> Using from definition: init=epsg:31467
> Rel. 4.8.0, 6 March 2012
> <cs2cs>:
> projection initialization cause: no system list, errno: 20
> "
>
> I tried to "make uninstall" and "make install" but nothing was fixed!!
>
> Here are more details about my project:
>
> My locations are in Dresden city, Germany, (DHDN4), and I have (I assume)
> all what is needed to get my coordinates converted accurately, but no idea
> how to process them in Proj. 4 (I am totally new here):
>
> PROJCS["DHDN / Germany zone
> 4",GEOGCS["DHDN",DATUM["Deutsche_Hauptdreiecksnetz",
> SPHEROID["Bessel 1841",6377397.155,299.1528128]],PRIMEM["Greenwich",0],
> UNIT["degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],
> PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",12],
> PARAMETER["scale_factor",1],PARAMETER["false_easting",4500000],
> PARAMETER["false_northing",0],UNIT["metre",1]]
> TOWGS84=582.0,105.0,414.0,5.042e-6,1.696e-6,-1.4932e-5,8.3
> EPSG=31495
>
> %Seven parameters:
> % 582.00     - Translation dx in meter to WGS84
> % 105.0      - Translation dy in meter to WGS84
> % 414.50     - Translation dz in meter to WGS84
> % 5.042e-6   - Rotation ro (omega) in Radiant to WGS84
> % 1.696e-6   - Rotation rf (phi) in radiant to WGS84
> % -1.4932e-5 - Rotation rk (Kappa) in Radiant to WGS84
> % 8.3e-06    - Mapscale factor in ppm (parts per million) to WGS84(m)
>
> Sorry for the long thread but did not want to miss any details, even in my
> first ever thread in this forum.
>
> I will be looking forward to reading form you.
> Best regards,
> Amro
>
> --
> View this message in context:
> http://osgeo-org.1560.n6.nabble.com/Using-EPSG-codes-with-cs2cs-tp3841592p4957639.html
> Sent from the PROJ.4 mailing list archive at Nabble.com.
> _______________________________________________
> Proj mailing list
> Proj at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/proj
>
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