ABSTRACT
This chapter reviews the basic concepts of positional accuracy assessment. It describes historical positional accuracy assessment standards or guidelines and examines the compiled and widely accepted accuracy assessment standard, which incorporates concepts from earlier standards and guidelines. The chapter examines positional accuracy sample design and collection within the overall framework set forth in the American Society for Photogrammetry and Remote Sensing (ASPRS) 2014 standard. It considers basic statistical concepts and explains how to analyze the accuracy assessment sample data to estimate positional accuracy under the APSRS 2014 standards. Positional accuracy assesses the correctness of the coordinates of an image or a map. Several factors can affect the positional accuracy of a map or geo-referenced image. The ASPRS 2014 standard systematically incorporates the relevant concepts of the standards or guidelines that preceded it. It is an exhaustive document and rightfully has become the de facto standard worldwide for positional accuracy assessment.
