SmartRS

SmartRS

Series

Introduction to PyQGIS.

In this learning series, we explain basics of using of Python QGIS.

Articles in this series

1- Open Python console

Jun 25, 2021 1 min read 148 views

QGIS provides PyQGIS (Python API). It allows developers to built new tools and automates work. QGIS provides Python console for scripting. You can open it from the: Plugins ► Python Console menu.

2- Typing in Python console

Jun 25, 2021 1 min read 81 views

In the Python console use print() function to write. Print("Hello My Dear Learner!") Then click "Enter"

3- Writing script on "Script editor"

Jun 25, 2021 1 min read 54 views

For long scripts, you can use Script editor. To open it, click on 'Show Editor".

4- Loading a vector layer

Jun 25, 2021 1 min read 69 views

You can download the data that we are using. Then, get the path of the shapefile uri = "D:/Python_QGIS/data/Countries.shp" The format is: vlayer = iface.addVectorLayer(data_source, layer_name, provider_name) iface.addVectorLayer(uri, "countries",...

5- Loading raster files

Jun 25, 2021 1 min read 35 views

For loading raster files, GDAL library is used. Firstly, download the data. Then, get the path of the raster file: uri = "D:/Python_QGIS/data/dem_subset.tif" Now add the layer The format is: rlayer = iface.addRasterLayer(data_source, layer_name, pro...

6- Retrieving information of vector layer

Jun 25, 2021 1 min read 27 views

We use fields() on a QgsVectorLayer to retrieve information about the fields of a vector layer. uri = "D:/Python_QGIS/data/Countries.shp" vlayer = QgsVectorLayer(uri, "Countries", "ogr") for field in vlayer.fields(): print(field.name())