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Mastering  QGIS

You're reading from   Mastering QGIS Go beyond the basics and unleash the full power of QGIS with practical, step-by-step examples

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Product type Paperback
Published in Sep 2016
Publisher Packt
ISBN-13 9781786460370
Length 486 pages
Edition 2nd Edition
Tools
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Authors (5):
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Kurt Menke, GISP Kurt Menke, GISP
Author Profile Icon Kurt Menke, GISP
Kurt Menke, GISP
 Corti Corti
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Corti
 Smith Jr., GISP Smith Jr., GISP
Author Profile Icon Smith Jr., GISP
Smith Jr., GISP
 Pirelli Pirelli
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Pirelli
 Van Hoesen, GISP Van Hoesen, GISP
Author Profile Icon Van Hoesen, GISP
Van Hoesen, GISP
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Table of Contents (19) Chapters Close

Mastering QGIS - Second Edition
Credits
Foreword
About the Authors
About the Reviewer
www.PacktPub.com
Preface
1. A Refreshing Look at QGIS FREE CHAPTER 2. Creating Spatial Databases 3. Styling Raster and Vector Data 4. Preparing Vector Data for Processing 5. Preparing Raster Data for Processing 6. Advanced Data Creation and Editing 7. Advanced Data Visualization 8. The Processing Toolbox 9. Automating Workflows with the Graphical Modeler 10. Creating QGIS Plugins with PyQGIS and Problem Solving 11. PyQGIS Scripting Index

Creating raster surfaces via interpolation


QGIS supports surface interpolation from vector points to a raster using the Interpolation plugin. The Interpolation tool supports Inverse Distance Weighted (IDW) and Triangular Interpolation (TIN). To enable the Interpolation plugin, click on Manage and Install Plugins under Plugins.

As an example of how to use the Interpolation tool, let's use the Pecos DEM Points.shp sample file to interpolate a surface using IDW:

  1. Add Pecos DEM Points.shp to the map canvas.

  2. Open the Interpolation plugin tool by navigating to Raster | Interpolation | Interpolation. The tool is shown in the following figure and uses the Pecos DEM Points.shp sample file as the input vector layer:

    The interface of the Interpolation tool is identical whether IDW or TIN is chosen as the Interpolation method. The only exceptions are the Interpolation method parameters, which can be set by clicking on the configure button (). For this example, we will only cover the IDW parameter (distance...

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