[Proj] Coordinate transformation assistance

José Alberto Gonçalves jagoncal at fc.up.pt
Mon Apr 23 04:47:28 EDT 2007


To list units run "proj -lu" in the comand line.
Other list options area -le for ellipsoids and -lp for projections.
You can find proj dodumentation in http://proj.maptools.org/


Jose Gonçalves

Bjørn Krangnes wrote:

>Importing as a PROJ.4 string is working fine. Thank you !
>Where can I find documentation on syntax for proj4 string. eg:
>+units= xx, what are the available units?
>>Bjørn Krangnes wrote:
>>>The expected result is Easting:200049.410 Northing: 199965.743 (sorry,
>>>typo error in my previous answer)
>>>I forgot to mention that I still get returncode 6 from ImportFromEPSG.
>>>Also adding the EPSG file for both ITM and IG.
>>># IRENET95 / Irish Transverse Mercator
>>><2157> +proj=tmerc +lat_0=53.5 +lon_0=-8 +k=0.999820 +x_0=600000
>>>+y_0=750000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs  <>
>>># TM75 / Irish Grid
>>><29903> +proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1.000035 +x_0=200000
>>>+y_0=250000 +a=6377340.189 +b=6356034.447938534 +units=m +no_defs  <>
>>Note that OGR's ImportFromEPSG() method does not read the PROJ.4 epsg
>>init file.  It reads the gcs.csv and pcs.csv files from the GDAL
>>distribution ... a more direct dump of the EPSG parameters.  Adding a
>>new projection to the PROJ.4 epsg file won't generally help OGR.
>>As Tamas suggests, I'd encourage you to directly import as a PROJ.4
>>Best regards,
>>I set the clouds in motion - turn up   | Frank Warmerdam,
>>warmerdam at pobox.com
>>light and sound - activate the windows | http://pobox.com/~warmerdam
>>and watch the world go round - Rush    | President OSGeo, http://osgeo.org
>>Proj mailing list
>>Proj at lists.maptools.org
>Bjørn Krangnes
>Devonor AS
>Telephone: +47 32 29 96 90
>Direct Line: +47 32 29 96 91
>Mobile: +47 45035640
>E-mail: bkr at devonor.com
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