April 2018
Beginner to intermediate
440 pages
11h 36m
English
Content preview from Mastering Geospatial Analysis with Python
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Drawing points
Before you learn how to load the data from PostGIS, we will first cover how to draw multiple points, convert them to a feature, add them to a layer, then load the layer to the map. The following code will walk you through the process.
Start by creating a memory layer as shown in the code:
theLayer=QgsVectorLayer('Point?crs=epsg:4326','SomePoints','memory')
The previous code creates a vector layer and assigns it to the variable theLayer. The parameters are the type and coordinate reference system of the layer, the name for the layer panel, and we specified that it is a memory layer.
Next, you need to create the features:
from qgis.PyQt.QtCore import *theFeatures=theLayer.dataProvider()theFeatures.addAttributes([QgsField("ID", ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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