[GIS] Defining layer CRS and avoiding CRS dialog in PyQGIS

coordinate systempyqgisvector

There is an existing Shapefile, which I want to add.

At the moment my code looks like:

self.iface.addVectorLayer(self.shpFilePath, "Track", "ogr")

It works fine, but i want to define the crs within the code. Is it possible?
I found some similar questions like this one: Programmatically Select a CRS in QGIS 2.4 using Python

But i don't get it work anyway.

Best Answer

I solve the similar problem this way:

from qgis.core import *
from qgis.gui import *

layer = QgsVectorLayer(self.shpFilePath, "Track", "ogr")
crs = layer.crs()
crs.createFromId(4326)
layer.setCrs(crs)
QgsMapLayerRegistry.instance().addMapLayer(layer)

Related Solutions

QGIS Python – Programmatically Selecting CRS in QGIS Using Python

In your case you can add the item to define the crs string to the URI like &crs=EPSG:4326.

Your code should look as follows:

uri = "file:///C:/data.csv?type=csv&xField=lng&yField=lat&spatialIndex=no&subsetIndex=no&watchFile=no&crs=EPSG:4326"
vlayer = QgsVectorLayer(uri, 'Points', "delimitedtext")

QgsMapLayerRegistry.instance().addMapLayer(vlayer)

As said above, you have an alternative by accesing to the settings of QGIS, the follow snippet does what I suggest before and uses the CRS defined in your project:

from PyQt4.QtCore import QSettings

s = QSettings()
## possible values are: prompt, useProject, useGlobal
s.setValue("/Projections/defaultBehaviour", "useProject")

## here your code ##

QGIS – Setting Project CRS to User Defined Coordinate System with PyQGIS

In QGIS 3.0 it is very easy. For instance our epsg is 2320:

QgsProject.instance().setCrs(QgsCoordinateReferenceSystem(2320))

Best Answer

Related Solutions

QGIS Python – Programmatically Selecting CRS in QGIS Using Python

QGIS – Setting Project CRS to User Defined Coordinate System with PyQGIS

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