Earth Science - Vegetation

Extract Raster Values Using Vector Boundaries in R

This lesson reviews how to extract pixels from a raster dataset using a vector boundary. We can use the extracted pixels to calculate mean and max tree height for a study area (in this case a field site where we measured tree heights on the ground. Finally we will compare tree heights derived from lidar data compared to tree height measured by humans on the ground.

last updated: 19 Oct 2017

Clip Raster in R

You can clip a raster to polygon extent to save processing time and make images more manageable. Learn how to crop a raster dataset in R.

last updated: 23 Nov 2017

Classify a raster in R.

This lesson presents how to classify a raster dataset and export it as a new raster in R.

last updated: 19 Oct 2017

Plot histograms of raster values in R

This lesson introduces the raster geotiff file format - which is often used to store lidar raster data. We cover the 3 key spatial attributes of a raster dataset including Coordinate reference system, spatial extent and resolution.

last updated: 19 Oct 2017

Introduction to lidar raster data products

This lesson introduces the raster geotiff file format - which is often used to store lidar raster data. We cover the 3 key spatial attributes of a raster dataset including Coordinate reference system, spatial extent and resolution.

last updated: 19 Oct 2017

What is LIDAR Data

This lesson reviews what lidar remote sensing is, what the lidar instrument measures and discusses the core components of a lidar remote sensing system.

last updated: 23 Nov 2017