Extracting Raster Values using Points, Polygons & Lines | QGIS

In this tutorial, you will learn how to extract raster values using points, polygons and lines with the aid of QGIS. QGIS can be used to inspect raster data, especially with the aid of 'Identify Features' where you would be able to obtain the pixel value by manually clocking over the raster pixel. However, if you had to perform this task for a massive point dataset, it can be rather challenging to perform this task manually. However using the Sample Raster Values tool of QGIS, you would be able to load in a points shapefile, and extract the raster pixel values that spatially intersects the locations of the points just in one go.

If you are interested in obtaining spatial statistics/ zonal statistics, you would be able use the Zonal Statistics tool to obtain information such as average, sum, min, max of the pixel values that are bounded by a user define polygon. Furthermore, if you want to extract raster values along a line to create a 2D profile graph, you would be able to do that using the Profiles from Lines (SAGA GIS) tool.

Here's the timeline:

00:00 - Introduction
02:05 - Extracting Raster Values using Points
06:45 - Extracting Raster Values using Polygons
12:08 - Extracting Raster Values using Lines

#raster #qgis #zonalstatistics