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Mastering Geospatial Analysis with Python
book

Mastering Geospatial Analysis with Python

by Silas Toms, Paul Crickard, Eric van Rees
April 2018
Beginner to intermediate content levelBeginner to intermediate
440 pages
11h 36m
English
Packt Publishing
Content preview from Mastering Geospatial Analysis with Python

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", ...
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Publisher Resources

ISBN: 9781788293334Supplemental Content