[Proj] Using EPSG codes with cs2cs

[rps_rt]

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


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