date:20160331

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

2016-03-31 Thread Andre Joost


Am 01.04.2016 um 08:12 schrieb Andre Joost:

Am 31.03.2016 um 16:55 schrieb Nicolas Cadieux:

Hi Andreas,
That is very interesting. I would like to know more about these grids
and how QGIS deals with it.  Do you have any additional links to
share?
All I can see is that the proj4 parameters for many of the CRS in
North America are identical and lead to no actual changes in the
coordinate unless you are going from nad27 to nad 83 or Wgs84 which is
more drastic.
That is why I use the nrcan tool that can do transformation based
on  ITRF and WGS84 CRS.
I would be nice to do that strait in QGIS. I will look into your
method and report back.


QGIS already uses a grid shift file internally for the conversion from
NAD27 to WGS84. But there is not yet any grid shift file that reflects
newer tectonic moves, like NAD83(CSRS98) would need.



Update: You might find some grid file resources in the following document:



HTH,
André Joost


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

2016-03-31 Thread Andre Joost


Am 31.03.2016 um 16:55 schrieb Nicolas Cadieux:

Hi Andreas,
That is very interesting. I would like to know more about these grids and how QGIS 
deals with it.  Do you have any additional links to share?
All I can see is that the proj4 parameters for many of the CRS in North America 
are identical and lead to no actual changes in the coordinate unless you are 
going from nad27 to nad 83 or Wgs84 which is more drastic.
That is why I use the nrcan tool that can do transformation based on  ITRF 
and WGS84 CRS.
I would be nice to do that strait in QGIS. I will look into your method and 
report back.


QGIS already uses a grid shift file internally for the conversion from 
NAD27 to WGS84. But there is not yet any grid shift file that reflects 
newer tectonic moves, like NAD83(CSRS98) would need.


If you have one, you need to build a custom CRS with a link to the file. 
A sample entry would be:


+proj=tmerc +lat_0=39.66 +lon_0=-8.1319062 +k=1 
+x_0=0 +y_0=0 +ellps=intl +nadgrids=./DLX_ETRS89_geo.gsb +units=m +no_defs


It might help to set the complete path to the .gsb file.

Greetings,
André Joost


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Re: [Qgis-user] QGIS freezes in designer

2016-03-31 Thread Carlos Cerdán

I also happens in Windows 7 - 64 bits / QGIS 12.4.1

2016-03-31 15:36 GMT-05:00 Carlos Cerdán :

> HI there
>
> QGIS 2.14.1
> Ubuntu 15.10 - 64 bits
>
> In designer, when I try to change the width of one map through properties,
> QGIS freezes.
>
> It happens if i select the current value in the "width" box of "position
> and size" and try to overwrite it with another value, typing it.
>
> If I change the size by clicking and dragging it goes fine.
>
> Someone else has this error? It's a bug?
>
> Carlos Cerdán
>
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[Qgis-user] QGIS freezes in designer

2016-03-31 Thread Carlos Cerdán

HI there

QGIS 2.14.1
Ubuntu 15.10 - 64 bits

In designer, when I try to change the width of one map through properties,
QGIS freezes.

It happens if i select the current value in the "width" box of "position
and size" and try to overwrite it with another value, typing it.

If I change the size by clicking and dragging it goes fine.

Someone else has this error? It's a bug?

Carlos Cerdán
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Re: [Qgis-user] vector shp from NAD83 (CSRS98) to UTM WGS84

2016-03-31 Thread Nicolas Cadieux

Hi Andreas, 
That is very interesting. I would like to know more about these grids and how 
QGIS deals with it.  Do you have any additional links to share? 
All I can see is that the proj4 parameters for many of the CRS in North America 
are identical and lead to no actual changes in the coordinate unless you are 
going from nad27 to nad 83 or Wgs84 which is more drastic. 
That is why I use the nrcan tool that can do transformation based on  ITRF 
and WGS84 CRS. 
I would be nice to do that strait in QGIS. I will look into your method and 
report back. 
Nicolas 
On Mar 31, 2016 10:24 AM, "Neumann, Andreas [via OSGeo.org]" 
 wrote: 
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 <[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 
GIS application Haity Mobile Tel: 0050946057393 
++
 Italy Mobile Tel.: **(39) 338 24 40 676 
++
 SKYPE azzurrahydro 
++
 [hidden
 email] 
++
 *Par respect pour l'environnement,* *n'imprimez ce mail qu'en cas 
d'absolue nécessité*   

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 here.  Re: [Qgis-user] vector shp from NAD83 (CSRS98) to UTM WGS84

2016-03-31

Thread
Neumann, Andreas

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 < 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
> GIS application 
> Haity Mobile Tel: 0050946057393
> ++
> Italy Mobile Tel.: **(39) 338 24 40 676
> ++
> SKYPE azzurrahydro
> ++
>  href="/user/SendEmail.jtp?type=node&node=5258986&i=1">[hidden
>  email]
> ++
> *Par respect pour l'environnement,*
> 
> *n'imprimez ce mail qu'en cas d'absolue nécessité*
> 
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Re: [Qgis-user] vector shp from NAD83 (CSRS98) to UTM WGS84

2016-03-31

Thread
Nicolas Cadieux

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]   " 
 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 < 
[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 GIS 
application Haity Mobile Tel: 0050946057393 
++
 Italy Mobile Tel.: **(39) 338 24 40 676 
++
 SKYPE azzurrahydro 
++
 [hidden email] 
++
 *Par respect pour l'environnement,* *n'imprimez ce mail qu'en cas 
d'absolue nécessité*   

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NAML 

nad83_geomatica2006.pdf (6M) 

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

2016-03-31

Thread
Joris Hintjens

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  
> 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
> GIS application 
> Haity Mobile Tel: 0050946057393
> ++
> Italy Mobile Tel.: **(39) 338 24 40 676
> ++
> SKYPE azzurrahydro
> ++
> azzurralent...@gmail.com 
> ++
> *Par respect pour l'environnement,*
> 
> *n'imprimez ce mail qu'en cas d'absolue nécessité*
> 
>  
> 
> 
> 
> 
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[Qgis-user] SpatiaLite - sqlite database delete

2016-03-31

Thread
Lester Anderson

Hi all,

Very quick one. How do I delete a Spatialite sqlite database? Cannot
see an obvious way in DB manager. If I delete the .sqlite file in
Windows explorer, it still shows up in the list.

Did read that these databases could be deleted via the QGIS browser,
but did not see any way there either to delete.

Looked at QGIS 2.10, 2.12

Thanks
Lester
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Re: [Qgis-user] vector shp from NAD83 (CSRS98) to UTM WGS84

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

Re: [Qgis-user] QGIS freezes in designer

[Qgis-user] QGIS freezes in designer

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

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

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

[Qgis-user] SpatiaLite - sqlite database delete

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