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

[K Imran M]

Andre,

It works brilliantly (though I can not make any sense on the addition due
to my limited knowledge).
Now, my two shapefiles - one in RSO and another one in WGS 84 - overlay
perfectly. No more shift like before (when I used the Kertau RSO/RSO Malaya
(m)) where the two shapefiles did not overlay perfectly on one another
(around 180 meter shfit). So I guess it works ...

Many thanks

Best wishes,

Kamarul



On Mon, Jun 1, 2015 at 1:04 AM, Andre Joost <andre+joost at nurfuerspam.de>
wrote:

> Am 31.05.2015 um 16:33 schrieb K Imran M:
>
>> 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)?
>>
>
> I have not tested the two versions to measure the offset, but generally
> the epsg and WKT definitions have no datum shift parameters. See this
> mailing list entry for possible values and background:
>
> http://lists.maptools.org/pipermail/proj/2011-April/005656.html
>
>  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
>>
>
> This will not solve the datum shift issue.
>
>  2) should I transform the projection to any other projection?
>>
>
>
> Not a good idea, because the hotine oblique mercator is the right
> mathematical model for the projection.
>
>  Or
>
>> 3) should I use the User-define CRS? If yes, how can I do that?
>>
>
> This seems to be the best way:
> - Copy the proj.4 string definition of EPSG:3168 to the clipboard
> - Under Settings -> Custom CRS, fill in the string at the bottom
> - add the datum shift +towgs84=-11,851,5,0,0,0,0
> - give the CRS a good name
> - click on the green to add it to the list
> - delete the empty "new CRS" entry from the list
> - click on Ok
> - Rightclick on your layer, Set CRS for layer
> - scroll to the bottom to get your custom CRS
>
>
> 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 : drkamarul at usm.my <drkamarul at kb.usm.my> , k.musa at lancaster.ac.uk
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