You're reading from QGIS Python Programming Cookbook, Second Edition Automating geospatial development

Product type Paperback

Published in Mar 2017

Publisher Packt

ISBN-13 9781787124837

Length 464 pages

Edition 2nd Edition

Languages

Python

Tools

Eclipse

Concepts

Geospatial Analysis

Author (1):

Joel Lawhead

View More author details

Table of Contents (10) Chapters

Preface

1. Automating QGIS FREE CHAPTER

2. Querying Vector Data

3. Editing Vector Data

4. Using Raster Data

5. Creating Dynamic Maps

6. Composing Static Maps

7. Interacting with the User

8. QGIS Workflows

9. Other Tips and Tricks

Adding a point feature to a vector layer

This recipe performs the simplest possible edit to a vector layer instantiated from a shapefile. We will add a point to an existing point layer.

Getting ready

For this recipe, download the following zipped shapefile:

https://github.com/GeospatialPython/Learn/raw/master/NYC_MUSEUMS_GEO.zip

Extract the .shp, .shx, and .dbf files to the directory /qgis_data/nyc.

How to do it...

We will load the vector layer from the shapefile, create a new geometry object as a point, create a new feature, set the geometry, and add it to the layer's data provider. Finally, we will update the extents of the layer to make sure the bounding box of the layer encapsulates the new point:

Start QGIS.
From the Plugins menu, select Python Console.

First, load the layer:

        vectorLyr = QgsVectorLayer('/qgis_data/nyc/NYC_MUSEUMS_GEO.shp',
                                   'Museums' , "ogr")

Now, we will access the layer's data provider:
```
  ...
```

The rest of the chapter is locked

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Authors (1)

Joel Lawhead

Joel Lawhead is a PMI-certified Project Management Professional (PMP), a certified GIS Professional (GISP), and vice president of NVision Solutions, Inc., an award-winning firm specializing in geospatial technology integration and sensor engineering for NASA, FEMA, NOAA, the US Navy, and many other commercial and non-profit organizations. Joel began using Python in 1997 and started combining it with geospatial software development in 2000. He has authored multiple editions of Learning Geospatial Analysis with Python and QGIS Python Programming Cookbook, both from Packt. He is also the developer of the open source Python Shapefile Library (PyShp) and maintains a geospatial technical blog.

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