This tutorial, provided by Virginia Geospatial Extension, is part of a series of 30 videos that cover remotely sensed data in ArcMap 10.x versions. This tutorial is divided into two videos (20A and 20B) and covers "accuracy assessment of Landsat Imagery." Gathering data to complete an error matrix is demonstrated. This video runs 04:26 minutes in length. The other videos in the series are available to view separately.This video series can be used in conjunction with the Remote Sensing Analysis in an ArcMap Environment 2nd Edition e-book by Tammy Parece, James B. Campbell, and John McGee or used as a stand-alone learning resource