Hi Olivier,
I have been playing with this and I think you should use the source on the
layer and not on the data provider.
Here is some code (which also modifies the style of the layer)
https://github.com/QGEP/customizer/blob/master/customizer.py#L129-L141
I was doing a layer.reload() after
On Wed, 26 Sep 2018 at 09:02, Olivier Dalang wrote:
>
> Dear List,
>
> As simple as it sounds, I'm struggling with changing the datasource of layers
> with python :
>
> layer1 = QgsVectorLayer('/path/to/a.shp')
> QgsProject.instance().addMapLayer(layer1)
>
Dear List,
As simple as it sounds, I'm struggling with changing the datasource of
layers with python :
layer1 = QgsVectorLayer('/path/to/a.shp')
QgsProject.instance().addMapLayer(layer1)
layer1.dataProvider().setDataSourceUri('/path/to/b.shp')
The layer successfully changes on map redraw.
On Tue, 25 Sep 2018 at 22:36, Raymond Nijssen wrote:
>
> 1. Can I open a layout window with a python command?
designer = iface.openLayoutDesigner( layout )
> 2. Can I turn on "atlas preview" with a python command?
You'd have to do some fragile code to do this. Basically:
- get designer window
Hi Harrissou,
thanks for reporting your ideas, probably nobody knows better than you
"black areas" of the docs.
What do other docs people think? I don't want to put too much wood in
the fire, but maybe if we all agree, we can think to add some priority
labels depending on the lack of documented
>[...]
>Caris LOTS: 14.737 km^2
>ArcMap: 14.727,446 km^2
>MapInfo:14.727,352 km^2
>GeoMedia: 14.726,443 km^2
>Planimeter: 14.722,522 km^2
>QGIS 3.2: 14.652,181 km^2
>QGIS 2.8: 14.652,181 km^2
>[...]
>My suspicion is that the geodesic algorithm used by QGIS (and apparently
GRASS) is
Hi,
The CAD import and export functions for QGIS 3x are already extremely
impressive and in several ways exceed the import/export capability of ArcGIS
desktop 10.5/6.
As mentioned in a previous post the only function that the QGIS import can't
handle yet is when the CAD file (dwg or dxf)
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Calvin,
I am quite sure that Charles Karney holds an undisputed claim of the Most
Accurate Geodesic Algorithm™. At least I haven’t come across any papers
offering better accuracy.
Google Earths figure of 14.672 km^2 is very similar to MapInfos spherical area
calculation of 14.670 km^2, so for
Kristian,
Thanks for those calculations. Before this discussion I was contemplating
doing a line and polygon measurement tool for Shape Tools by clicking on an
existing shape and using geographiclib calculate the measurements, but if
it is possible to replace the existing QGIS measuring functions
Right, here are the calculated areas as returned by a number of different GIS
applications and the planimeter app of GeographicLib for reference:
Caris LOTS: 14.737 km^2
ArcMap: 14.727,446 km^2
MapInfo:14.727,352 km^2
GeoMedia: 14.726,443 km^2
Planimeter: 14.722,522 km^2
QGIS 3.2:
1. Can I open a layout window with a python command?
2. Can I turn on "atlas preview" with a python command?
Hope anyone knows!
Kind regards,
Raymond
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Hi all (sorry for the cross-posting but it's because the call was made if
I'm not wrong on all the three channels)
Thanks to those that already applied and happy to see that Documentation
repo will likely be lively in upcoming weeks.
If that can help to attract more people, these are some of the
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>> We use a direct port from GRASS:
This may also be caused by:
/*
* From original rttopo documentation:
* Tested against:
* http://mascot.gdbc.gov.bc.ca/mascot/util1b.html
* and
* http://www.ga.gov.au/nmd/geodesy/datums/vincenty_direct.jsp
*/
QgsPointXY
It's not a small area, that's why I have been nitpicking ellipsoid area
calculation
algorithms!
I did end up doing the calculations with geographiblib to get a reference to
judge
various other calculations by. It's a pain in the butt to extract the data from
a
polygon shapefile (or whatever)
On Tue, 25 Sep 2018 at 16:59, Kristian Evers wrote:
>
> Hi Paolo,
>
> I have some rought notes that I can try to polish up a bit and share here.
> I'll see if I can find the time for that today. I didn't get to the bottom of
> the problem but I am leaning towards the issue being that QGIS uses an
On Tue, 25 Sep 2018 at 16:43, Otto Dassau wrote:
>
> thanks for the info Nyall!
Ok, PR opened. https://github.com/qgis/QGIS/pull/8016
But for reference -- I think what's going to be more useful for layout
use is the 3.4 @map_layers variable. As noted in the earlier reply,
some functions are
Hi Paolo,
I have some rought notes that I can try to polish up a bit and share here.
I'll see if I can find the time for that today. I didn't get to the bottom of
the problem but I am leaning towards the issue being that QGIS uses an
inferior algorithm to determine geodesics. Unfortunately I
thanks for the info Nyall!
Regards,
Otto
Am Tue, 25 Sep 2018 16:37:38 +1000
schrieb Nyall Dawson :
> On Mon, 24 Sep 2018 at 19:20, Otto Dassau wrote:
> >
> > Dear Devs,
> >
> > in QGIS 3 I found the expression "is_layer_active" within the copyright
> > decoration very useful. I would like to
On Mon, 24 Sep 2018 at 19:20, Otto Dassau wrote:
>
> Dear Devs,
>
> in QGIS 3 I found the expression "is_layer_active" within the copyright
> decoration very useful. I would like to use this expression also within the
> print composer, but it seems to be not available there.
Confirmed -- fix
Hi Kristian,
Il 09/25/2018 07:24 AM, Kristian Evers ha scritto:
>
>
> On a related note, I have been meaning to raise a similar issue based
> on QGIS’s not so accurate polygon-area-on-the-ellipsoid calculations.
> A colleague of mine came across some differences between QGIS and
> CARIS LOTS
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