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ASSESSING ACCURACY OF NET CHANGE DERIVED FROM LAND COVER MAPS
Citation:
Stehman, S. V. AND J D. Wickham. ASSESSING ACCURACY OF NET CHANGE DERIVED FROM LAND COVER MAPS. PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING. American Society for Photogrammetry and Remote Sensing, Bethesda, MD, 72(2):175-186, (2006).
Impact/Purpose:
The objective of this task is to produce land-cover and related products that are needed to meet Annual Performance Goals (APG) under GPRA Goals Clean Air, Clean Water, and Healthy and Safe Communities, and to meet the critical needs of EPA Regional Offices.
Description:
Net change derived from land-cover maps provides important descriptive information for environmental monitoring and is often used as an input or explanatory variable in environmental models. The sampling design and analysis for assessing net change accuracy differ from traditional methods focusing on single date or gross change maps. Different metrics are needed to describe net change accuracy, and implementing stratified sampling is more complicated because of the many different estimates required. Mean absolute deviation estimated for user-defined reporting domains is used to characterize net change accuracy. If stratified sampling is implemented to improve precision for high priority reporting domains ( e.g., high net change), the number and identity of strata must be chosen with the recognition that improved precision for some estimates is achieved at the expense of poorer precision for other estimates. The accuracy assessment strategy and a design evaluation protocol are demonstrated using net change derived from the 1992 and preliminary 2001 National Land-Cover Data of the United States.