[Qgis-user] matching .prj (ArcGIS) with CRS in QGIS

[Nicolas Cadieux]

Hi, 
I have done this in the past using documents found here. Qgis uses proj.4 syntax. 
http://ie.unc.edu/cempd/projects/mims/spatial_beta/external/PROJ4.html 
You can create user defined projection in "Setting/custom CRS". 
Good luck! 
Nicolas Cadieux M.Sc. 
Les Entreprises Archéotec inc.  
8548, rue Saint-Denis Montréal H2P 2H2 
Téléphone: 514.381.5112  Fax: 514.381.4995 
www.archeotec.ca 
On May 31, 2015 10:30 AM, "K Imran M [via OSGeo.org]" <ml-node+s1560n5208316h57 at n6.nabble.com> wrote: 

	Dear Andre, Is it possible, because of the different WKT string specification, my shape files was misaligned for about 200 meters to 300 meters when I chose Kertau (RSO)/RSO Malaya (m) (EPSG:3168) as the projection (OTF)? In view of that issue, can you advise me if I  1) can I still use the Kertau (RSO)/RSO Malaya (m) (EPSG:3168) projection? Or 2) should I transform the projection to any other projection? Or 3) should I use the User-define CRS? If yes, how can I do that? I apologize for any trivial questions here. Your responses is very much appreciated. Thanks and best wishes, Kamarul On Sun, May 31, 2015 at 10:00 PM, Andre Joost < [hidden email] > wrote: <blockquote style="border-left:2px solid #cccccc;padding:0 1em" style="margin:0 0 0 0.8ex;border-left:1px #ccc solid;padding-left:1ex">Am 30.05.2015 um 23:31 schrieb Nicolas Cadieux: 
<blockquote style="border-left:2px solid #cccccc;padding:0 1em" style="margin:0 0 0 0.8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi, 
I am assuming QGIS cannot read this projection? 


You are right, the projection name is not known for QGIS. 

The WKT string for Kertau RSO is: 


PROJCS["Kertau (RSO) / RSO Malaya (m)", 
    GEOGCS["Kertau (RSO)", 
        DATUM["Kertau_RSO", 
            SPHEROID["Everest 1830 (RSO 1969)",6377295.664,300.8017, 
                AUTHORITY["EPSG","7056"]], 
            AUTHORITY["EPSG","6751"]], 
        PRIMEM["Greenwich",0, 
            AUTHORITY["EPSG","8901"]], 
        UNIT["degree",0.0174532925199433, 
            AUTHORITY["EPSG","9122"]], 
        AUTHORITY["EPSG","4751"]], 
    PROJECTION["Hotine_Oblique_Mercator"], 
    PARAMETER["latitude_of_center",4], 
    PARAMETER["longitude_of_center",102.25], 
    PARAMETER["azimuth",323.0257905], 
    PARAMETER["rectified_grid_angle",323.1301023611111], 
    PARAMETER["scale_factor",0.99984], 
    PARAMETER["false_easting",804670.24], 
    PARAMETER["false_northing",0], 
    UNIT["metre",1, 
        AUTHORITY["EPSG","9001"]], 
    AXIS["Easting",EAST], 
    AXIS["Northing",NORTH], 
    AUTHORITY["EPSG","3168"]] 

which looks similar to the one given, but the ellipsoid major axis is different, and False Easting. 

For the different namings of the projection, see 

https://trac.osgeo.org/gdal/ticket/2745 
http://lists.maptools.org/pipermail/proj/2010-September/005349.html 

HTH, 
André Joost 

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-- Dr. Kamarul Imran Musa, M.D. M.Community.Med. Associate Professor (Epidemiology and Biostatistics) &  Public Health Physician Dept of Community Medicine School of Medical Sciences 16150 Universiti Sains Malaysia, Kbg Kerian Kelantan Thomson Reuters researchID:  http://www.researcherid.com/rid/G-4864-2010 Google-scholar:  http://scholar.google.co.uk/citations?user=aZyayMgAAAAJ&hl=en&authuser=1 blog:  http://designdataanalysis.wordpress.com     email :  [hidden email]  ,  [hidden email] 

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