Re: [Qgis-user] How to Degitize a raster immage

[Alister Hood]

And if you are thinking of manually tracing over a raster image you just
need the tools on the "digitisation" and "advanced digitisation"
toolbars.  There is help on these in the user manual.

> Date: Wed, 2 Nov 2011 16:52:49 -0700
> From: Mars 
> Subject: Re: [Qgis-user] How to Degitize a raster immage
> To: Mumtaz Lakho 
> Cc: QGIS-Users 
> Message-ID: <9293d6af-3204-49f6-bf99-b7d2d7889...@gmail.com>
> Content-Type: text/plain; charset="us-ascii"
> 
> Besides Geo-Referencing a Raster image, there is also a function
called
> "Feature Extraction". I Believe there is a plugin for extracting
Vector
> Features from a DEM and possibly other functions to extract features
from other
> types of Rasters. Perhaps if Geo-referencing is not your primary goal
you can
> research feature extraction to give you some background.
> 
> Sent from my iPhone
> 
> On 2011-11-02, at 12:57 PM, Mumtaz Lakho 
wrote:
> 
> > Dear QGIS Repr.
> > Would u please guide me the process of Digitizationof raster layer
under
> QGIS 1.7.1- wroclaw
> > thanks
> > (Mumtaz)
> > a QGIS User
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user

Re: [Qgis-user] How to Degitize a raster immage

[Mars]

Besides Geo-Referencing a Raster image, there is also a function called 
"Feature Extraction". I Believe there is a plugin for extracting Vector 
Features from a DEM and possibly other functions to extract features from other 
types of Rasters. Perhaps if Geo-referencing is not your primary goal you can 
research feature extraction to give you some background.  

Sent from my iPhone

On 2011-11-02, at 12:57 PM, Mumtaz Lakho  wrote:

> Dear QGIS Repr.
> Would u please guide me the process of Digitizationof raster layer  under 
> QGIS 1.7.1- wroclaw
> thanks 
> (Mumtaz)
> a QGIS User
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user

Re: [Qgis-user] How to Degitize a raster immage

[Werner Macho]

Hi Mumtaz!

I am not quite sure what you mean with "Digitization of raster layer"
but I assume you mean something like georeferencing any raster image you
have ..
So a very good starting point for that would be:
http://glaikit.org/2011/03/27/image-georeferencing-with-qgis/
or
http://people.umass.edu/nrc297s/PDFs/Lab_Georeferencing_with_QGIS.pdf

So all you need is activate the georeferencing plugin and start ..

Hope that helps you get started a bit

kind regards
Werner


On 11/02/2011 08:57 PM, Mumtaz Lakho wrote:
> Dear QGIS Repr.
> Would u please guide me the process of Digitizationof raster layer
>  under QGIS 1.7.1- wroclaw
> thanks 
> (Mumtaz)
> a QGIS User
>
>
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user

___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user

[Qgis-user] How to Degitize a raster immage

[Mumtaz Lakho]

Dear QGIS Repr.
Would u please guide me the process of Digitizationof raster layer  under QGIS 
1.7.1- wroclaw
thanks 
(Mumtaz)
a QGIS User___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user

Re: [Qgis-user] Scale seems strange in

[Brad Nesom]

so did you understand why?
lat lon is not an equidistant coordinate system. It is an angular measure.
The graticules merge closer togehter the further north they go.
When you overlay data projected to ll onto a flat surface the lengths east
west at the top are shorter than the lengths east west at the bottom.
that is what is changing the scale because without zooming the scale of the
objects would change by panning the map north and south.
Nothng about the scale is changing except the distance measured across. No
coordinate values.
HTH



On Wed, Nov 2, 2011 at 10:12 AM, James Stott
wrote:

>   If I use the arrow keys to pan north and south the scale changes. If I
> use them to pan left and right it doesn’t change.
>
> ** **
>
>  *James Stott* BSc (Hons) MSc | Senior Professional
> *Nicholas Pearson Associates *| 30 Brock Street | Bath | BA1 2LN
> *T:* 01225 445548 | *M:* -
> *www.npaconsult.co.uk* 
>
>   *From:* kidsmake6until2...@gmail.com [mailto:
> kidsmake6until2...@gmail.com] *On Behalf Of *Brad Nesom
> *Sent:* 02 November 2011 15:00
> *To:* James Stott
> *Cc:* Saber Razmjooei; qgis-user@lists.osgeo.org
> *Subject:* Re: [Qgis-user] Scale seems strange in
>
> ** **
>
> I am thinking rather than that it is just the fact that when you use
> degrees, moving in the map would give you a different scale.
>
> Because every time you move north or south you have changed the length of
> the x distance.
>
> If you pan left and right (very carefully) do you see the scale not change?
> 
>
>
>
>  
>
> On Wed, Nov 2, 2011 at 9:02 AM, James Stott 
> wrote:
>
> Could this just be a windows thing then? I tried an older version of
> qgis-dev (1.8.0-78) on a different windows machine in the office and there
> are no problems. Metres should be the default setting for 27700 shouldn't
> it not degrees?
>
>
> James Stott BSc (Hons) MSc | Senior Professional
> Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
> T: 01225 445548 | M: -
> http://www.npaconsult.co.uk/
>
> -Original Message-
> From: Saber Razmjooei [mailto:razmjoo...@faunalia.co.uk]
> Sent: 02 November 2011 10:48
> To: James Stott
> Cc: qgis-user@lists.osgeo.org
> Subject: RE: [Qgis-user] Scale seems strange in
>
> James
>
> I am using QGIS-Trunk under ubuntu 10.04. The canvas projection is set
> to 27700 and Layer unit to metre.
>
> The scale seems to be fine and not affected by panning.
>
> Cheers
> Saber
>
> On Wed, 2011-11-02 at 10:43 +, James Stott wrote:
> > An update:
> >
> >
> >
> > This is also happening on a colleague’s machine. I have reverted back
> > to the previous OSGeo4W nightly and that doesn’t fix the problem.
> > Uninstalling and reinstalling doesn’t work.
> >
> >
> >
> > In 1.7, if I open up this certain dataset of viewpoint locations, it
> > opens with a scale of 1:53478. In 1.8 if I load the dataset it opens
> > at a scale of 1:5325654358. If I use the pan tool and just click on
> > the map the scale changes to 1:631588609, then 1:2918610855, then
> > 1:2934133484 and so on. Distance measures seem unaffected. It seems to
> > be being caused by the units of the project being set to degrees. I
> > have saved a project and the units are set to degrees. If I open an
> > old project up it opens at the correct scale. In my old project files
> > it is set to metres. (see examples below). It seems I have to make
> > sure Enable on the fly projection is unticked in the project
> > properties, and then manually set the Layer units to metres in the
> > general tab.
> >
> >
> >
> > I was also having problems a while ago with exporting to MapInfo but I
> > have just tried this and it works. See links below for details. It is
> > including the 79 not the 104 now.
> >
> >
> >
> >
> http://gis.stackexchange.com/questions/14350/qgis-and-mapinfo-projections-epsg-27700-british-national-grid
> >
> > http://hub.qgis.org/issues/4271
> >
> >
> >
> > New project:
> >
> >
> >
> > 
> >
> > degrees
> >
> > 
> >
> > 384571.226869
> >
> > 78401.536498
> >
> > 408875.829430
> >
> > 92579.221325
> >
> > 
> >
> > 0
> >
> > 
> >
> > 
> >
> > +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717
> > +x_0=40 +y_0=-10 +ellps=airy
> > +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m
> > +no_defs
> >
> > 2437
> >
> > 27700
> >
> > EPSG:27700
> >
> > OSGB 1936 / British National
> > Grid
> >
> > tmerc
> >
> > airy
> >
> > false
> >
> > 
> >
> > 
> >
> > 
> >
> >
> >
> > Old project:
> >
> >
> >
> > 
> >
> > meters
> >
> > 
> >
> > 400790.090563
> >
> > 86512.592259
> >
> > 401731.465923
> >
> > 87217.568425
> >
> > 
> >
> > 0
> >
> > 
> >
> >

[Qgis-user] Spatial Query and Highlight geo queries

[Carlos Andrade]

Hi,

I'm new to this list, and I've just recently started using QuantumGis by
suggestion from PostGis community. I've been using QGis for an assignment
at university on an undergrad so I only know the very basics since we are
learning it on our own for a pres.

I have a postgres 9.1, a postgis 1.5.3 that runs okay, the QGIS 1.7.1 that
is okay as well running on a snow leopard on my mac. They are already
connected, and I've been able to use SPIT to load the QGis data into my
postgis database.

There is one thing missing that the professor wants and I've didnt discover
yet, and so I was in hope someone here would have already come across this
situation. I need to show the professor when I run a sql query on my
database (could be on qgis as well as a last resort) the results not only
show up on a terminal window, but have it highlight on the layers file on
qgis (which since has a render of the real map would actually show the real
place on the map).

I saw that Spatial Query did the trick, however it seems still growing and
there are very few functions that do what I need. Besides, i don't input
any SQL statement on it, but the result is just what I wanted: it highlight
the shapes that comes as results.

So, the question is, does anyone know any tool that could do this? I also
saw Query Builder, but it doesn't seem to work the way I want and sql is
just for where clause.

Thank you and Best Regards,


Carlos Andrade
http://carlosandrade.co
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user

RE: [Qgis-user] Scale seems strange in

[James Stott]

If I use the arrow keys to pan north and south the scale changes. If I
use them to pan left and right it doesn't change.



From: kidsmake6until2...@gmail.com [mailto:kidsmake6until2...@gmail.com]
On Behalf Of Brad Nesom
Sent: 02 November 2011 15:00
To: James Stott
Cc: Saber Razmjooei; qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Scale seems strange in



I am thinking rather than that it is just the fact that when you use
degrees, moving in the map would give you a different scale.

Because every time you move north or south you have changed the length
of the x distance.

If you pan left and right (very carefully) do you see the scale not
change?





On Wed, Nov 2, 2011 at 9:02 AM, James Stott
 wrote:

Could this just be a windows thing then? I tried an older version of
qgis-dev (1.8.0-78) on a different windows machine in the office and
there are no problems. Metres should be the default setting for 27700
shouldn't it not degrees?


James Stott BSc (Hons) MSc | Senior Professional
Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
T: 01225 445548 | M: -
http://www.npaconsult.co.uk/


James Stott BSc (Hons) MSc | Senior Professional
Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
T: 01225 445548 | M: -
http://www.npaconsult.co.uk/

-Original Message-
From: Saber Razmjooei [mailto:razmjoo...@faunalia.co.uk]
Sent: 02 November 2011 10:48
To: James Stott
Cc: qgis-user@lists.osgeo.org
Subject: RE: [Qgis-user] Scale seems strange in

James

I am using QGIS-Trunk under ubuntu 10.04. The canvas projection is set
to 27700 and Layer unit to metre.

The scale seems to be fine and not affected by panning.

Cheers
Saber

On Wed, 2011-11-02 at 10:43 +, James Stott wrote:
> An update:
>
>
>
> This is also happening on a colleague's machine. I have reverted back
> to the previous OSGeo4W nightly and that doesn't fix the problem.
> Uninstalling and reinstalling doesn't work.
>
>
>
> In 1.7, if I open up this certain dataset of viewpoint locations, it
> opens with a scale of 1:53478. In 1.8 if I load the dataset it opens
> at a scale of 1:5325654358. If I use the pan tool and just click on
> the map the scale changes to 1:631588609, then 1:2918610855, then
> 1:2934133484 and so on. Distance measures seem unaffected. It seems to
> be being caused by the units of the project being set to degrees. I
> have saved a project and the units are set to degrees. If I open an
> old project up it opens at the correct scale. In my old project files
> it is set to metres. (see examples below). It seems I have to make
> sure Enable on the fly projection is unticked in the project
> properties, and then manually set the Layer units to metres in the
> general tab.
>
>
>
> I was also having problems a while ago with exporting to MapInfo but I
> have just tried this and it works. See links below for details. It is
> including the 79 not the 104 now.
>
>
>
>
http://gis.stackexchange.com/questions/14350/qgis-and-mapinfo-projection
s-epsg-27700-british-national-grid
>
> http://hub.qgis.org/issues/4271
>
>
>
> New project:
>
>
>
> 
>
> degrees
>
> 
>
> 384571.226869
>
> 78401.536498
>
> 408875.829430
>
> 92579.221325
>
> 
>
> 0
>
> 
>
> 
>
> +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717
> +x_0=40 +y_0=-10 +ellps=airy
> +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m
> +no_defs
>
> 2437
>
> 27700
>
> EPSG:27700
>
> OSGB 1936 / British National
> Grid
>
> tmerc
>
> airy
>
> false
>
> 
>
> 
>
> 
>
>
>
> Old project:
>
>
>
> 
>
> meters
>
> 
>
> 400790.090563
>
> 86512.592259
>
> 401731.465923
>
> 87217.568425
>
> 
>
> 0
>
> 
>
> 
>
> +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717
> +x_0=40 +y_0=-10 +ellps=airy
> +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m
> +no_defs
>
> 2437
>
> 27700
>
> EPSG:27700
>
> OSGB 1936 / British National
> Grid
>
> tmerc
>
> airy
>
> false
>
> 
>
> 
>
> 
>
>
>
>
>
>
>
>
> James Stott BSc (Hons) MSc | Senior Professional
> Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
> T: 01225 445548 | M: -
> www.npaconsult.co.uk 
>
>
>
> From: qgis-user-boun...@lists.osgeo.org
> [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of James Stott
> Sent: 01 November 2011 09:15
> To: qgis-user@lists.osgeo.org
> Subject: [Qgis-user] Scale seems strange in
>
>
>
>
> Hi all,
>
>
>
> I am having problems with scales on v1.8 (7297b23) from OSGeo4W.
>
>
>
> If I open an existing project everything 

Re: [Qgis-user] Scale seems strange in

[Brad Nesom]

I am thinking rather than that it is just the fact that when you use
degrees, moving in the map would give you a different scale.
Because every time you move north or south you have changed the length of
the x distance.
If you pan left and right (very carefully) do you see the scale not change?



On Wed, Nov 2, 2011 at 9:02 AM, James Stott wrote:

> Could this just be a windows thing then? I tried an older version of
> qgis-dev (1.8.0-78) on a different windows machine in the office and there
> are no problems. Metres should be the default setting for 27700 shouldn't
> it not degrees?
>
>
> James Stott BSc (Hons) MSc | Senior Professional
> Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
> T: 01225 445548 | M: -
> http://www.npaconsult.co.uk/
>
> -Original Message-
> From: Saber Razmjooei [mailto:razmjoo...@faunalia.co.uk]
> Sent: 02 November 2011 10:48
> To: James Stott
> Cc: qgis-user@lists.osgeo.org
> Subject: RE: [Qgis-user] Scale seems strange in
>
> James
>
> I am using QGIS-Trunk under ubuntu 10.04. The canvas projection is set
> to 27700 and Layer unit to metre.
>
> The scale seems to be fine and not affected by panning.
>
> Cheers
> Saber
>
> On Wed, 2011-11-02 at 10:43 +, James Stott wrote:
> > An update:
> >
> >
> >
> > This is also happening on a colleague’s machine. I have reverted back
> > to the previous OSGeo4W nightly and that doesn’t fix the problem.
> > Uninstalling and reinstalling doesn’t work.
> >
> >
> >
> > In 1.7, if I open up this certain dataset of viewpoint locations, it
> > opens with a scale of 1:53478. In 1.8 if I load the dataset it opens
> > at a scale of 1:5325654358. If I use the pan tool and just click on
> > the map the scale changes to 1:631588609, then 1:2918610855, then
> > 1:2934133484 and so on. Distance measures seem unaffected. It seems to
> > be being caused by the units of the project being set to degrees. I
> > have saved a project and the units are set to degrees. If I open an
> > old project up it opens at the correct scale. In my old project files
> > it is set to metres. (see examples below). It seems I have to make
> > sure Enable on the fly projection is unticked in the project
> > properties, and then manually set the Layer units to metres in the
> > general tab.
> >
> >
> >
> > I was also having problems a while ago with exporting to MapInfo but I
> > have just tried this and it works. See links below for details. It is
> > including the 79 not the 104 now.
> >
> >
> >
> >
> http://gis.stackexchange.com/questions/14350/qgis-and-mapinfo-projections-epsg-27700-british-national-grid
> >
> > http://hub.qgis.org/issues/4271
> >
> >
> >
> > New project:
> >
> >
> >
> > 
> >
> > degrees
> >
> > 
> >
> > 384571.226869
> >
> > 78401.536498
> >
> > 408875.829430
> >
> > 92579.221325
> >
> > 
> >
> > 0
> >
> > 
> >
> > 
> >
> > +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717
> > +x_0=40 +y_0=-10 +ellps=airy
> > +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m
> > +no_defs
> >
> > 2437
> >
> > 27700
> >
> > EPSG:27700
> >
> > OSGB 1936 / British National
> > Grid
> >
> > tmerc
> >
> > airy
> >
> > false
> >
> > 
> >
> > 
> >
> > 
> >
> >
> >
> > Old project:
> >
> >
> >
> > 
> >
> > meters
> >
> > 
> >
> > 400790.090563
> >
> > 86512.592259
> >
> > 401731.465923
> >
> > 87217.568425
> >
> > 
> >
> > 0
> >
> > 
> >
> > 
> >
> > +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717
> > +x_0=40 +y_0=-10 +ellps=airy
> > +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m
> > +no_defs
> >
> > 2437
> >
> > 27700
> >
> > EPSG:27700
> >
> > OSGB 1936 / British National
> > Grid
> >
> > tmerc
> >
> > airy
> >
> > false
> >
> > 
> >
> > 
> >
> > 
> >
> >
> >
> >
> >
> >
> >
> >
> > James Stott BSc (Hons) MSc | Senior Professional
> > Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
> > T: 01225 445548 | M: -
> > www.npaconsult.co.uk
> >
> >
> >
> > From: qgis-user-boun...@lists.osgeo.org
> > [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of James Stott
> > Sent: 01 November 2011 09:15
> > To: qgis-user@lists.osgeo.org
> > Subject: [Qgis-user] Scale seems strange in
> >
> >
> >
> >
> > Hi all,
> >
> >
> >
> > I am having problems with scales on v1.8 (7297b23) from OSGeo4W.
> >
> >
> >
> > If I open an existing project everything is fine.
> >
> >
> >
> > If I open data in a fresh QGIS session it is reporting strange scales.
> > It doesn’t matter what source the data is. For example, I open a

RE: [Qgis-user] Scale seems strange in

[James Stott]

Could this just be a windows thing then? I tried an older version of qgis-dev 
(1.8.0-78) on a different windows machine in the office and there are no 
problems. Metres should be the default setting for 27700 shouldn't it not 
degrees?


James Stott BSc (Hons) MSc | Senior Professional
Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
T: 01225 445548 | M: -
http://www.npaconsult.co.uk/

-Original Message-
From: Saber Razmjooei [mailto:razmjoo...@faunalia.co.uk]
Sent: 02 November 2011 10:48
To: James Stott
Cc: qgis-user@lists.osgeo.org
Subject: RE: [Qgis-user] Scale seems strange in

James

I am using QGIS-Trunk under ubuntu 10.04. The canvas projection is set
to 27700 and Layer unit to metre.

The scale seems to be fine and not affected by panning.

Cheers
Saber

On Wed, 2011-11-02 at 10:43 +, James Stott wrote:
> An update:
>
>
>
> This is also happening on a colleague’s machine. I have reverted back
> to the previous OSGeo4W nightly and that doesn’t fix the problem.
> Uninstalling and reinstalling doesn’t work.
>
>
>
> In 1.7, if I open up this certain dataset of viewpoint locations, it
> opens with a scale of 1:53478. In 1.8 if I load the dataset it opens
> at a scale of 1:5325654358. If I use the pan tool and just click on
> the map the scale changes to 1:631588609, then 1:2918610855, then
> 1:2934133484 and so on. Distance measures seem unaffected. It seems to
> be being caused by the units of the project being set to degrees. I
> have saved a project and the units are set to degrees. If I open an
> old project up it opens at the correct scale. In my old project files
> it is set to metres. (see examples below). It seems I have to make
> sure Enable on the fly projection is unticked in the project
> properties, and then manually set the Layer units to metres in the
> general tab.
>
>
>
> I was also having problems a while ago with exporting to MapInfo but I
> have just tried this and it works. See links below for details. It is
> including the 79 not the 104 now.
>
>
>
> http://gis.stackexchange.com/questions/14350/qgis-and-mapinfo-projections-epsg-27700-british-national-grid
>
> http://hub.qgis.org/issues/4271
>
>
>
> New project:
>
>
>
> 
>
> degrees
>
> 
>
> 384571.226869
>
> 78401.536498
>
> 408875.829430
>
> 92579.221325
>
> 
>
> 0
>
> 
>
> 
>
> +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717
> +x_0=40 +y_0=-10 +ellps=airy
> +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m
> +no_defs
>
> 2437
>
> 27700
>
> EPSG:27700
>
> OSGB 1936 / British National
> Grid
>
> tmerc
>
> airy
>
> false
>
> 
>
> 
>
> 
>
>
>
> Old project:
>
>
>
> 
>
> meters
>
> 
>
> 400790.090563
>
> 86512.592259
>
> 401731.465923
>
> 87217.568425
>
> 
>
> 0
>
> 
>
> 
>
> +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717
> +x_0=40 +y_0=-10 +ellps=airy
> +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m
> +no_defs
>
> 2437
>
> 27700
>
> EPSG:27700
>
> OSGB 1936 / British National
> Grid
>
> tmerc
>
> airy
>
> false
>
> 
>
> 
>
> 
>
>
>
>
>
>
>
>
> James Stott BSc (Hons) MSc | Senior Professional
> Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
> T: 01225 445548 | M: -
> www.npaconsult.co.uk
>
>
>
> From: qgis-user-boun...@lists.osgeo.org
> [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of James Stott
> Sent: 01 November 2011 09:15
> To: qgis-user@lists.osgeo.org
> Subject: [Qgis-user] Scale seems strange in
>
>
>
>
> Hi all,
>
>
>
> I am having problems with scales on v1.8 (7297b23) from OSGeo4W.
>
>
>
> If I open an existing project everything is fine.
>
>
>
> If I open data in a fresh QGIS session it is reporting strange scales.
> It doesn’t matter what source the data is. For example, I open a
> dataset and it reports 1:784735546. It seems to report correct
> distances. If I pan the scale changes.
>
>
>
> I am using EPSG 27700 (British National Grid).
>
>
>
> Does anyone have any idea what can be causing this?
>
>
>
> James
>
> James Stott BSc (Hons) MSc | Senior Professional
> Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
> T: 01225 445548 | M: -
> www.npaconsult.co.uk
>
> Nicholas Pearson Associates, LogoNicholas Pearson Associates, Latest
> News
>
>
>
> Information and Registered Address
>
> This Electronic Transmission is intended only for the attention of the
> addressee. It may contain privileged and confidential information. If
> you are not the person for whom it is intended, you must not copy,
> distribute or take

Re: [Qgis-user] Re: Swipe functionality

[maning sambale]

I don't think this is available already in QGIS but the Dockable
MirrorMap plugin can be an inspiration to develop such a feature.

On Wed, Nov 2, 2011 at 4:16 PM,   wrote:
> Yep, ArcGIS does the same thing under the same name too, so it's not an
> uncommon feature.
> Unfortunately I do need it to be a QGIS extension because we have a
> pre-deployed QGIS project that is interested in it. However, it's an "icing
> on the cake" feature, so not mandatory.
> Thanks though,
> Jonathan
>
>
> From:        Jukka Rahkonen 
> To:        qgis-user@lists.osgeo.org
> Date:        02/11/2011 07:07
> Subject:        [Qgis-user] Re: Swipe functionality
> Sent by:        qgis-user-boun...@lists.osgeo.org
> 
>
>
>   writes:
>
>>
>> Ah, these are multi-band images I'm using. The
>> problem with QGIS relying on plugins is that you're also relying on the
>> documentation for those plugins, and this one doesn't seem to have much
>> for instance.Swipe basically allows you to "swipe"
>> a raster layer off so you can compare it with what's below. Best described
>> with a video - http://www.youtube.com/watch?v=IBl0eKPE37I-see from ~55
> seconds.Cheers,Jonathan From:
>>  Giovanni Manghi To:
>
> Hi,
>
> Seems to be the same functionality and with the same name as in ERDAS
> Imagine.
> OSSIM can do it, see page 9 in this document
> http://download.osgeo.org/ossim/docs/pdfs/ImageLinker_Tutorial.pdf
> I am not sure how good OSSIM is with vector layers. OSSIM itself is getting
> better with vectors but Image Linker is quite old and not developed any
> more.
> However, it will not hurt to have a look at OSSIM if you want to do some
> serious
> raster processing.
>
> -Jukka Rahkonen-
>
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
>
>
>
> This transmission is intended for the named addressee(s) only and may
> contain sensitive or protectively marked material up to RESTRICTED and
> should be handled accordingly. Unless you are the named addressee (or
> authorised to receive it for the addressee) you may not copy or use it, or
> disclose it to anyone else. If you have received this transmission in error
> please notify the sender immediately. All email traffic sent to or from us,
> including without limitation all GCSX traffic, may be subject to recording
> and/or monitoring in accordance with relevant legislation.
>
> ___
> Qgis-user mailing list
> Qgis-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
>
>



-- 
cheers,
maning
--
"Freedom is still the most radical idea of all" -N.Branden
wiki: http://esambale.wikispaces.com/
blog: http://epsg4253.wordpress.com/
--
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user

RE: [Qgis-user] Scale seems strange in

[Saber Razmjooei]

James

I am using QGIS-Trunk under ubuntu 10.04. The canvas projection is set
to 27700 and Layer unit to metre.

The scale seems to be fine and not affected by panning.

Cheers
Saber

On Wed, 2011-11-02 at 10:43 +, James Stott wrote:
> An update:
> 
>  
> 
> This is also happening on a colleague’s machine. I have reverted back
> to the previous OSGeo4W nightly and that doesn’t fix the problem.
> Uninstalling and reinstalling doesn’t work.
> 
>  
> 
> In 1.7, if I open up this certain dataset of viewpoint locations, it
> opens with a scale of 1:53478. In 1.8 if I load the dataset it opens
> at a scale of 1:5325654358. If I use the pan tool and just click on
> the map the scale changes to 1:631588609, then 1:2918610855, then
> 1:2934133484 and so on. Distance measures seem unaffected. It seems to
> be being caused by the units of the project being set to degrees. I
> have saved a project and the units are set to degrees. If I open an
> old project up it opens at the correct scale. In my old project files
> it is set to metres. (see examples below). It seems I have to make
> sure Enable on the fly projection is unticked in the project
> properties, and then manually set the Layer units to metres in the
> general tab.
> 
>  
> 
> I was also having problems a while ago with exporting to MapInfo but I
> have just tried this and it works. See links below for details. It is
> including the 79 not the 104 now.
> 
>  
> 
> http://gis.stackexchange.com/questions/14350/qgis-and-mapinfo-projections-epsg-27700-british-national-grid
> 
> http://hub.qgis.org/issues/4271
> 
>  
> 
> New project:
> 
>  
> 
> 
> 
> degrees
> 
> 
> 
> 384571.226869
> 
> 78401.536498
> 
> 408875.829430
> 
> 92579.221325
> 
> 
> 
> 0
> 
> 
> 
> 
> 
> +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717
> +x_0=40 +y_0=-10 +ellps=airy
> +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m
> +no_defs
> 
> 2437
> 
> 27700
> 
> EPSG:27700
> 
> OSGB 1936 / British National
> Grid
> 
> tmerc
> 
> airy
> 
> false
> 
> 
> 
> 
> 
> 
> 
>  
> 
> Old project:
> 
>  
> 
> 
> 
> meters
> 
> 
> 
> 400790.090563
> 
> 86512.592259
> 
> 401731.465923
> 
> 87217.568425
> 
> 
> 
> 0
> 
> 
> 
> 
> 
> +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717
> +x_0=40 +y_0=-10 +ellps=airy
> +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m
> +no_defs
> 
> 2437
> 
> 27700
> 
> EPSG:27700
> 
> OSGB 1936 / British National
> Grid
> 
> tmerc
> 
> airy
> 
> false
> 
> 
> 
> 
> 
> 
> 
>  
> 
>  
> 
>  
> 
> 
> James Stott BSc (Hons) MSc | Senior Professional
> Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
> T: 01225 445548 | M: -
> www.npaconsult.co.uk 
> 
> 
> 
> From: qgis-user-boun...@lists.osgeo.org
> [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of James Stott
> Sent: 01 November 2011 09:15
> To: qgis-user@lists.osgeo.org
> Subject: [Qgis-user] Scale seems strange in
> 
> 
>  
> 
> Hi all,
> 
>  
> 
> I am having problems with scales on v1.8 (7297b23) from OSGeo4W.
> 
>  
> 
> If I open an existing project everything is fine.
> 
>  
> 
> If I open data in a fresh QGIS session it is reporting strange scales.
> It doesn’t matter what source the data is. For example, I open a
> dataset and it reports 1:784735546. It seems to report correct
> distances. If I pan the scale changes.
> 
>  
> 
> I am using EPSG 27700 (British National Grid). 
> 
>  
> 
> Does anyone have any idea what can be causing this?
> 
>  
> 
> James
> 
> James Stott BSc (Hons) MSc | Senior Professional
> Nicholas Pearson Associates | 30 Brock Street | Bath | BA1 2LN
> T: 01225 445548 | M: -
> www.npaconsult.co.uk 
> 
> Nicholas Pearson Associates, LogoNicholas Pearson Associates, Latest
> News
> 
> 
> 
> Information and Registered Address 
> 
> This Electronic Transmission is intended only for the attention of the
> addressee. It may contain privileged and confidential information. If
> you are not the person for whom it is intended, you must not copy,
> distribute or take any action in reliance on it. If you have received
> this electronic transmission in error please notify us immediately by
> telephone, delete the transmission and destroy any hard copies. 
> 
> Nicholas Pearson Associates has used all reasonable efforts to ensure
> that this message and any attachments are free from viruses.
> 
> Nicholas Pearson Associates, 30 Brock Street, Bath, BA1 2LN , Tel: +44
> (0) 01225 445548, Fax: +44 (0) 01225 312387, Website:
> http://www.npaconsult

Re: [Qgis-user] Re: Swipe functionality

[jonathanmoules]

Yep, ArcGIS does the same thing under the same name too, so it's not an 
uncommon feature.
Unfortunately I do need it to be a QGIS extension because we have a 
pre-deployed QGIS project that is interested in it. However, it's an 
"icing on the cake" feature, so not mandatory.
Thanks though,
Jonathan 


From:   Jukka Rahkonen 
To: qgis-user@lists.osgeo.org
Date:   02/11/2011 07:07
Subject:[Qgis-user] Re: Swipe functionality
Sent by:qgis-user-boun...@lists.osgeo.org



  writes:

> 
> Ah, these are multi-band images I'm using. The
> problem with QGIS relying on plugins is that you're also relying on the
> documentation for those plugins, and this one doesn't seem to have much
> for instance.Swipe basically allows you to "swipe"
> a raster layer off so you can compare it with what's below. Best 
described
> with a video - http://www.youtube.com/watch?v=IBl0eKPE37I- see from ~55
seconds.Cheers,Jonathan From:  
>  Giovanni Manghi To:
 
Hi,

Seems to be the same functionality and with the same name as in ERDAS 
Imagine.
OSSIM can do it, see page 9 in this document
http://download.osgeo.org/ossim/docs/pdfs/ImageLinker_Tutorial.pdf
I am not sure how good OSSIM is with vector layers. OSSIM itself is 
getting
better with vectors but Image Linker is quite old and not developed any 
more.
However, it will not hurt to have a look at OSSIM if you want to do some 
serious
raster processing.

-Jukka Rahkonen-

___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user




This transmission is intended for the named addressee(s) only and may contain 
sensitive or protectively marked material up to RESTRICTED and should be 
handled accordingly. Unless you are the named addressee (or authorised to 
receive it for the addressee) you may not copy or use it, or disclose it to 
anyone else. If you have received this transmission in error please notify the 
sender immediately. All email traffic sent to or from us,  including without 
limitation all GCSX traffic, may be subject to recording and/or monitoring in 
accordance with relevant legislation.
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user

Re: [Qgis-user] Topology Rule

[Paolo Cavallini]

Il 02/11/2011 04:50, mharrop1980 ha scritto:

> We are just looking at QGIS as a way of capturing new pipeline data for our
> water network data. I'm wondering if its possible in QGIS to set certain
> topology rules.

I think this is a good candidate for a plugin.
Most probably its development will cost less that a single licence of the 
software
you are going to replace.
All the best.
-- 
Paolo Cavallini - Faunalia
www.faunalia.eu
Full contact details at www.faunalia.eu/pc
___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user

[Qgis-user] Re: Swipe functionality

[Jukka Rahkonen]

  writes:

> 
> Ah, these are multi-band images I'm using. The
> problem with QGIS relying on plugins is that you're also relying on the
> documentation for those plugins, and this one doesn't seem to have much
> for instance.Swipe basically allows you to "swipe"
> a raster layer off so you can compare it with what's below. Best described
> with a video - http://www.youtube.com/watch?v=IBl0eKPE37I- see from ~55
seconds.Cheers,Jonathan From:      
>  Giovanni Manghi To:
     
Hi,

Seems to be the same functionality and with the same name as in ERDAS Imagine.
OSSIM can do it, see page 9 in this document
http://download.osgeo.org/ossim/docs/pdfs/ImageLinker_Tutorial.pdf
I am not sure how good OSSIM is with vector layers. OSSIM itself is getting
better with vectors but Image Linker is quite old and not developed any more.
However, it will not hurt to have a look at OSSIM if you want to do some serious
raster processing.

-Jukka Rahkonen-

___
Qgis-user mailing list
Qgis-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-user