12
votes
Accepted
Renaming GeoPackage layer to be the same as GeoPackage file
Try this. (You'll have to adjust it to match your exact
data/situation)
import os
geopackage_folder = r'/home/bera/Desktop'
for root, folder, files in os.walk(geopackage_folder):
for file in ...
- 72.6k
11
votes
Accepted
Adding multiple Additional options to QGIS Batch processing?
You use the pipe character "|" to separate your options, so for your options you would use:
COMPRESS=JPEG|JPEG_QUALITY=75|PHOTOMETRIC=YCBCR|TILED=YES
i.e
This is now documented:
For Batch ...
- 65.8k
10
votes
Accepted
Write output of QGIS Batch Processing to temporary layers
Yes it is. You must use the keyword
TEMPORARY_OUTPUT
in the field that sets the output location.
Don't forget to check Load layers on completion then!
- 288
10
votes
Refactoring several attribute fields at the same time
You can use pyqgis with a dictionary:
Change first four lines:
lyr = QgsProject.instance().mapLayersByName('ok_ak_riks')[0]
sourcefield = 'A'
destfield = 'abcd'
remap = {1:'foo', 2:'bar'}
...
- 72.6k
10
votes
Refactoring several attribute fields at the same time
You can use "Refactor Fields" tool.
Specify field Type as Text for the fields you need to change.
Copy the expression to the fields and change the field names in the expression. (I ...
- 76.8k
10
votes
Batch renaming of columns in attribute table for shapefiles using QGIS
Use this script. As a precaution, backup the shapefile first.
#generate monthyear
months = ["JAN","FEB","MAR","APR","MAY","JUN","JUL&...
- 76.8k
9
votes
Batch removing null geometries
Removing null geometries from just a few layers
Use the "select by expression" button to select features with null geometries. The "select by expression" button is found by clicking the arrow next to ...
- 24.8k
9
votes
Accepted
Creating several new fields at once with QGIS field calculator in batch mode in the same layer/file
You can do stuff close to that using refactor fields in batch mode or in graphical modeler. However, when not using this in combination with graphical modeler, I think it is way more convenient to use ...
- 34.4k
9
votes
Accepted
Batch processing of numerous shapefiles in common folder with PyQGIS
While using QGIS processing tool in a script, two parameters are mandatory: the tool name and dictionary-like tool parameters (must be in a dictionary). Therefore, you have to pass the second ...
- 76.8k
8
votes
Accepted
What's the batched Refactor Fields tool "field mapping" syntax in QGIS?
It is not very comfortable to do, but the following is the required syntax for that textbox (I write it in several lines only for the sake of clearness):
{'expression': u'type the expression here',
'...
- 16.2k
8
votes
Calculating sum of line length for hundred vector layers
Use PyQGIS:
#Create an empty table in memory and add fields
newtable = QgsVectorLayer("None", "Results", "memory")
provider = newtable.dataProvider()
provider....
- 72.6k
7
votes
Batch Clipping Single Raster with Multiple Shapefiles in ArcPy?
This uses multiple shape features in a single shapefile (based on your code snippet). If you have a single shape feature in multiple shapefiles I have added code for that further down.
The following ...
- 29.7k
7
votes
Accepted
Batch export from multiple QGS projects to image or PDF
First try.
Thanks to PyQGIS, we can call the Maps Printer plugin's functions to achieve what you want! So, having such plugin installed, adjust your own settings in Your settings section of the ...
- 36.3k
7
votes
Renaming Shapefiles in QGIS?
For R users, I wrote a quick R function that batch renames the .shp file and all files associated. It's pretty bare bones, and there is no error checking, etc., so if it fails you'll need to do a ...
- 828
7
votes
Accepted
Batch flip direction of selected lines in ArcGIS 10.3
The Editing toolbox in ArcToolbox has a tool called Flip Line, which will reverse the direction of every line (or selected lines if any are selected) in the chosen feature class or layer.
This can be ...
- 29.7k
7
votes
Accepted
Updating field with layer name on multiple layers with PyQGIS script?
Just happens that I created a script for a very similar thing recently (my script merges multiple layers into a new layer, while adding a new attribute to each feature describing where it stems from; ...
- 1,767
7
votes
Using Batch Raster Calculator in QGIS
This is actually fairly easy to do. I think others might have an easier solution but this is how I do it:
Go to the Processing tab -> Graphical Modeler
2. Under inputs, add raster layer two times. ...
- 832
7
votes
Exporting multiple point shapefiles from one file using QGIS
In QGIS, you can find a tool in Vector/Data Management Tools/Split Vector Layer.
There you can define the column containing the species information as Unique ID field and it will generate a new file ...
- 2,307
7
votes
Copying all visible layers to new group
Use the following script.
root = QgsProject.instance().layerTreeRoot()
group = root.addGroup("group")
for layer in root.children():
if layer.isVisible() and layer != group:
_layer ...
- 76.8k
7
votes
Accepted
QGIS 3 changing layer CRS for multiple layers simultaneously
You can group all layers you want to change, right click the group and then "Set group CRS" should do what you asked for.
- 3,002
7
votes
Accepted
QGIS 3 batch processing - INPUT value not correct when autofill
That weird string is not a memory address, but the layer's id. You can use the following expression to construct INPUTLAYERNAME_clipped string. And no need string_to_array(@INPUT,'_')[0].
...
- 76.8k
7
votes
Accepted
Joining multiple layers in QGIS
You can use a Virtual layer through Layer > Add Layer > Add/Edit Virtual Layer... for that.
Use this query:
select
*
from
layer1 as l1,
layer2 as l2,
layer3 as l3,
layer4 as ...
- 71.2k
7
votes
Accepted
Deleting the same column(s) from different shapefiles in QGIS
A PyQGIS solution. Tested on QGIS 3.24.1-Tisler.
Proceed with Plugins > Python Console > Show Editor and paste one of the scripts below.
The press Run script and get the output.
This approach ...
- 32.8k
7
votes
Exporting several layers as GeoPackages at the same time in QGIS
Another solution is to use the "Package layers" tool as a Batch Process.
- 32.8k
6
votes
Can I export all print composers at the same time?
You can use the "Maps Printer" plugin, or the "multiprint" plugin which has this functionality.
To take it even further, you can export multiple print composers from multiple .qgs files using the ...
- 10.4k
6
votes
Accepted
Programmatically naming outputs from the QGIS Modeler?
Hit the ... button, set output file name and save like with usual saving single file. This create a basis for the files names. After hittingSave the Autofill settings should appear.
There you can ...
- 6,895
6
votes
Accepted
Batch save multiple rasters in QGIS
With this code snipped you would get all layers in your current project:
layers = QgsMapLayerRegistry.instance().mapLayers()
# for testing
for name, layer in layers.iteritems():
print name, ...
- 4,176
6
votes
Batch saving of multiple shapefiles of different types
This is working if you manually change the layer group name by editing line 7:
import datetime, os
out_folder = r'/home/bera/Desktop/tempgis/shapes/'
yearmonth = datetime.datetime.today().strftime('%...
- 72.6k
6
votes
Convert/migrate QGIS 2 Project to QGIS 3 Project automatically
Within QGIS, you can open your qgs files and save them as qgz
# Here simple list of files but you can use:
# - `os.walk` from `os` module https://pymotw.com/3/os/,
# - `pathlib` module https://pymotw....
- 30.7k
6
votes
QGIS 3 changing layer CRS for multiple layers simultaneously
Be aware: you want to reproject your layer or change the CRS of the layer? That are two fundamentally different things and the linked post presents options for both: that could lead to confusion.
...
- 71.2k
Only top scored, non community-wiki answers of a minimum length are eligible