> Objective

• This section shows how to sample values from raster data.  

• The student will also learn how to convert raster cells to points. 

> Index / Table of Contents

• Introduction  

• Tutorial(s)  

• QGIS installation  

> Summary and Highlights

Introduction 

Raster cells can be converted into points. The points will get the raster cell values. The following tutorials explain how to do this. It is also possible to create polygons containing the average value of points that lies in a given area. This method is showed in the last tutorial.  

Tutorial(s) 

• Convert raster cells to points   Hans van der Kwast: “Convert Raster Cells to Points in QGIS”  Language(s): English  Time: 1min 48s    https://www.youtube.com/watch?v=tffY43_BOO4 

• Sample values from different raster layers   Hans van der Kwast: “Sample Raster Values with Points in QGIS”  Language(s): English  Time: 2min    https://www.youtube.com/watch?v=wKccOpfs968  

• Extract the temperature from a point layer for each urban area and calculate the average temperature for a polygon layer   Ujaval Gandhi: “Sampling Raster Data using Points and Polygons (QGIS3)”/”Monsters nemen van rastergegevens met behulp van punten of polygonen (QGIS3)”  Language(s): English, Dutch   Chapters: overview of the task, get the data, procedure   EN: https://www.qgistutorials.com/en/docs/3/sampling_raster_data.html   NL: https://www.qgistutorials.com/nl/docs/3/sampling_raster_data.html 

> QGIS Installation

Do you still need to install QGIS? The QGIS installation and update section explains how to install QGIS on Windows and macOS. 

Useful Links 

QGIS Training Manual

QGIS User Guide

GIS OpenCourseWare

Hans van der Kwast YouTube channel

Ujaval Gandhi (QGIS Tutorials and Tips website) 

#QGIS, #Raster cells to points conversion, #Sample points