Hello,
I wrote a new page on the wiki (url : http://grass.osgeo.org/wiki/IGNF_register_and_shift_grid_NTF/RGF93). It's a tutorial to well use the French projection systems. Could you look and make some feedbacks, comments, modifications if it's necessary? People who want to do a French translation are welcome (I will begin this soon).
Grassly,
Thibault
Thibault,
closely concerned by this item, I'll soon try to have a glance at your
page. I have a set of test-data available in both NTF and RGF93 systems,
and Circé to validate back & forth shiftings. Thank you for this
contribution !
Vincent.
Le lundi 22 novembre 2010 à 21:10 +0100, Thibault Lemaitre a écrit :
Hello,
I wrote a new page on the wiki (url :
http://grass.osgeo.org/wiki/IGNF_register_and_shift_grid_NTF/RGF93).
It's a tutorial to well use the French projection systems. Could you
look and make some feedbacks, comments, modifications if it's necessary?
People who want to do a French translation are welcome (I will begin
this soon).Grassly,
Thibault
_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user
I updated the tutorial in question. There was some problem in the previous version : the modification of the PROJ_INFO file was not good and the grid file needs to be in the nad directory of GRASS. The method explained by the tutorial, needs the administrator rights on Linux.
Somebody knows more about the nadgrids specification in the PROJ_INFO file ? I mean, how to set a grid which is not in the nad directory of GRASS ? If there is this possibility, a simple normal user would be able to that.
I also created the French version of this tutorial. The French are welcome for the translation : http://grass.osgeo.org/wiki/IGNF_register_and_shift_grid_NTF-RGF93/fr.
Thanks for your feedback,
Thibault.
Le 23/11/2010 09:23, Vincent Bain a écrit :
Thibault,
closely concerned by this item, I'll soon try to have a glance at your
page. I have a set of test-data available in both NTF and RGF93 systems,
and Circé to validate back& forth shiftings. Thank you for this
contribution !Vincent.
Le lundi 22 novembre 2010 à 21:10 +0100, Thibault Lemaitre a écrit :
Hello,
I wrote a new page on the wiki (url :
http://grass.osgeo.org/wiki/IGNF_register_and_shift_grid_NTF/RGF93).
It's a tutorial to well use the French projection systems. Could you
look and make some feedbacks, comments, modifications if it's necessary?
People who want to do a French translation are welcome (I will begin
this soon).Grassly,
Thibault
_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user
On Thu, 2 Dec 2010, Thibault Lemaitre wrote:
I updated the tutorial in question. There was some problem in the previous version : the modification of the PROJ_INFO file was not good and the grid file needs to be in the nad directory of GRASS. The method explained by the tutorial, needs the administrator rights on Linux.
Somebody knows more about the nadgrids specification in the PROJ_INFO file ? I mean, how to set a grid which is not in the nad directory of GRASS ? If there is this possibility, a simple normal user would be able to that.
You should be able to just put the full path in the PROJ_INFO file - does that not work? If not can you post the contents of the PROJ_INFO file to the list.
We should probably include the French gridshift file for datum transformations NTF <--> RGF93 in the GRASS distribution, like we do for the USA, Canada, New Zealand files. That would make it very easy to use. How large is the file?
Paul
Le 02/12/2010 20:14, Paul Kelly a écrit :
On Thu, 2 Dec 2010, Thibault Lemaitre wrote:
I updated the tutorial in question. There was some problem in the previous version : the modification of the PROJ_INFO file was not good and the grid file needs to be in the nad directory of GRASS. The method explained by the tutorial, needs the administrator rights on Linux.
Somebody knows more about the nadgrids specification in the PROJ_INFO file ? I mean, how to set a grid which is not in the nad directory of GRASS ? If there is this possibility, a simple normal user would be able to that.
You should be able to just put the full path in the PROJ_INFO file - does that not work? If not can you post the contents of the PROJ_INFO file to the list.
I first try with “/usr/share/proj/ntf_r93.gsb”.
I didn’t try with something like “…/…/ntf_r93.gsb” (with the grid put in the grassdata folder). Should I try it or it’s useless and won’t work?
We should probably include the French gridshift file for datum transformations NTF ↔ RGF93 in the GRASS distribution, like we do for the USA, Canada, New Zealand files. That would make it very easy to use. How large is the file?
Like I write on the tutorial, the grid can be found on the IGN Lambert 93 website. It weight 271 Kio (small enough, no ?). Integrate this in grass is a good idea.
There is still a problem: this grid is not specified in the EPSG spec. but only in the IGNF register (76 Kio) (see the tutorial for more information).
As I report in the ticket 1219, proj integrate this (both the grid and the register), but not GRASS. In fact, when you use the EPSG location wizard, it would be very useful to be able to choose the IGNF register (/usr/share/proj/IGNF) instead of the epsg. I tried to select the IGNF file, but it doesn’t work (may be a parse problem). I would like to help the developers on this subject, but I don’t really know how to do more than an enhancement ticket.
Thibault.
Paul
PROJ_INFO (227 Bytes)