[Qgis-user] New dialog when opening layer with a different CRS

[Lene Fischer]

Hi,

Thanks for your explanation on this issue.

It would be a good idea if the developer added your text in the dialog box, or added as an option in the current dialog box.

I do not think that there are so many users who will use this function in daily life - and therefor a distraction - but usefull for you :)



Regards

Lene Fischer
Associate Professor

Department of Geosciences and Natural Resource Management
University of Copenhagen

MOB +45 40115084
lfi at ign.ku.dk<mailto:lfi at ign.ku.dk>


[SCIENCE_bomaerke_UK]


 -----Oprindelig meddelelse-----
Fra: qgis-user-bounces at lists.osgeo.org [mailto:qgis-user-bounces at lists.osgeo.org] På vegne af Saulteau Don
Sendt: 3. januar 2014 18:39
Til: qgis-user at lists.osgeo.org
Emne: Re: [Qgis-user] New dialog when opening layer with a different CRS



That's so a user can apply datum transformations from one coordinate system to another (ie, NAD27 <-> NAD83 <-> NAD83(CSRS)). They are usually compiled into Proj4 through grid shift binary files (.gsb) often available from federal or provincial and local agencies.



For example, in British Columbia, a lot of data comes in EPSG:26910 (UTM Zone 10N / NAD83) or EPSG:3005 (BC Albers / NAD83).



But converting either of those to EPSG:3153 (BC Albers / NAD83,CSRS) which uses the Canadian Spatial Reference Standard/System requires a custom "transformation" that can only be applied when using NTv2 grid shift files. Or old NRCAN Atlas of Canada data can come in a Lambert Conformal Conic projection in the NAD27 datum.



This is a long awaited feature and I'm very excited for it! This way I don't have to drop back to command line to do my vector data transformations.



http://webapp.geod.nrcan.gc.ca/geod/tools-outils/index.php

ftp://ftp.gdbc.gov.bc.ca/pub/world/NTv2.0

http://forums.arcgis.com/threads/4267-Custom-transformation-nad83-to-nad83-CSRS-for-British-Columbia









SaultDon







On Fri, Jan 3, 2014 at 2:38 AM, Lene Fischer <lfi at ign.ku.dk<mailto:lfi at ign.ku.dk>> wrote:

> Hi,

>

> Using QGIS weekly.

>

> When I open a new layer with a different CRS I get a dialog "Select

> datum transformations for layer .."

>

> I´ve already set "Enable on the fly" -

>

> Just clicking OK it works- but I don´t understand this dialog - can

> anyone help for an explonation?

>

> Regards

>

>

>

>

>

>

>

> Lene Fischer

>

> Associate Professor

>

>

>

> Department of Geosciences and Natural Resource Management

>

> University of Copenhagen

>

>

>

> MOB +45 40115084

>

> lfi at ign.ku.dk<mailto:lfi at ign.ku.dk>

>

>

>

>

>

>

>

>

>

>

>

>

>

> _______________________________________________

> Qgis-user mailing list

> Qgis-user at lists.osgeo.org<mailto:Qgis-user at lists.osgeo.org>

> http://lists.osgeo.org/mailman/listinfo/qgis-user

_______________________________________________

Qgis-user mailing list

Qgis-user at lists.osgeo.org<mailto:Qgis-user at lists.osgeo.org>

http://lists.osgeo.org/mailman/listinfo/qgis-user

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20140103/40f7a487/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 5594 bytes
Desc: image001.jpg
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20140103/40f7a487/attachment.jpg>