[Qgis-user] vector shp from NAD83 (CSRS98) to UTM WGS84

Thu Mar 31 07:37:50 PDT 2016

Hi Nicolas, 

That is not exactly true. 

QGIS can very well cope with grid-shift based transformations. This
requires an adequate grid shift file (a gsb file), which should be
placed in the folder share/proj 

National mapping agencies typically provide these grid-shift files. As
an example, our Swiss NMA provides these at
http://www.swisstopo.admin.ch/internet/swisstopo/en/home/products/software/products/chenyx06.html

QGIS automatically detects whether a grid shift file is necessary for a
transformation and if the appropriate gsb files is present it is used.
The accuracy of the transformation then depends on the grid-shift file
accuracy (resolution). 

The grid shift files can be used both for reprojecting vector and raster
data. 

Greetings, 

Andreas 

On 2016-03-31 15:54, Nicolas Cadieux wrote:

> Hi,
> It is my understanding that the parameters used in QGIS for that transformation are not sufficient  and will simply lead to a change in EPGS code number with no actual changes to the coordinates. 
> 
> If you are dealing with data in the 20k to 250k (like topo maps, SRTM), you can go ahead with that. Difference between both projection are basically due to continental drift and the addition of the third dimension. 
> 
> For anything submeter (Lidar, high precision GPS) I recommend using a more precise software.  I know that nrcan has good free tools for changing projection but I don't know if they handle anything else then points (TRX) I think.  Look at the links below for more information if needed.  File is included in attachment. 
> 
> Nicolas 
> 
> http://www.nrcan.gc.ca/earth-sciences/geomatics/geodetic-reference-systems/tools-applications/10925 
> 
> https://www.google.ca/url?sa=t&source=web&rct=j&url=http://www.naref.org/transf/nad83_geomatica2006.pdf&q=csrs98%20nad83&ved=0ahUKEwiex4GHiOvLAhUEdx4KHb0NAwcQFggpMAU&usg=AFQjCNHa-HRpS8Hcc1j74dAysyxgobNY1w&sig2=RRPnudp1rMyhmKYd7vbdoA
> 
> On Mar 31, 2016 8:20 AM, "Joris Hintjens [via OSGeo.org] " <[hidden email]> wrote:
> simply save the layer as a new one. "save as". you will be asked to enter the new CRS. 
> 
> joris 
> 
> Op 30 mrt. 2016, om 06:06 heeft Azzurra Lentini <<a href="/user/SendEmail.jtp?type=node&node=5258986&i=0">[hidden email]> het volgende geschreven: 
> 
> Hallo to all, 
> do you know how I can transform vectorial data from NAD83 (CSRS98) to UTM wgs84? 
> do you think if I do with reproject it would be ok?? or what u suggest?? 
> 
> thanks a lot  
> -- 
> 
> Dr. Hydrogeologist 
> AZZURRA LENTINI
> Expert of evaluation environmental hazards
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NAD83_GEOMATICA2006.PDF (6M) Download Attachment [1] 

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