Geoscience Reference
In-Depth Information
9
CHAPTER
Assessing the Accuracy of Satellite-Derived
Land-Cover Classification Using Historical Aerial
Photography, Digital Orthophoto Quadrangles, and
Airborne Video Data
Susan M. Skirvin, William G. Kepner, Stuart E. Marsh, Samuel E. Drake, John K. Maingi,
Curtis M. Edmonds, Christopher J. Watts, and David R. Williams
CONTENTS
9.1
Introduction...........................................................................................................................116
9.2
Background...........................................................................................................................116
9.2.1
Upper San Pedro Watershed Study Area .................................................................116
9.2.2
Reference Data Sources for Accuracy Assessment .................................................117
9.2.3
Reporting Accuracy Assessment Results .................................................................118
9.3
Methods ................................................................................................................................118
9.3.1
Image Classification .................................................................................................118
9.3.2
Sampling Design ......................................................................................................119
9.3.3
Historical Aerial Photography ..................................................................................120
9.3.3.1
Image Collection, Preparation, and Site Selection...................................121
9.3.3.2
Photograph Interpretation and Assessment...............................................121
9.3.4
Digital Orthophoto Quadrangles ..............................................................................121
9.3.4.1
Interpreter Calibration...............................................................................121
9.3.4.2
Sample Point Selection .............................................................................122
9.3.5
Airborne Videography ..............................................................................................122
9.3.5.1
Video and GIS Data Preparation ..............................................................122
9.3.5.2
Video Sample Point Selection ..................................................................122
9.3.5.3
Random Frame Selection and Evaluation ................................................123
9.4
Results...................................................................................................................................123
9.4.1
Aerial Photography Method .....................................................................................123
9.4.2
Digital Orthophoto Quadrangle Method ..................................................................124
9.4.3
Airborne Videography Method.................................................................................124
9.5
Discussion.............................................................................................................................125
9.5.1
Map Accuracies ........................................................................................................125
9.5.2
Class Confusion........................................................................................................125
9.5.3
Future Research ........................................................................................................128
115
