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William F. Manley , Leanne R. Lestak, and Eric G. Parrish INSTAAR, University of Colorado

High-Resolution Orthorectified Imagery for Three Target Areas in Lake Clark National Park and Preserve (LACL), Southwest Alaska. William F. Manley , Leanne R. Lestak, and Eric G. Parrish INSTAAR, University of Colorado. Introduction.

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William F. Manley , Leanne R. Lestak, and Eric G. Parrish INSTAAR, University of Colorado

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  1. High-Resolution Orthorectified Imagery for Three Target Areas in Lake Clark National Park and Preserve (LACL), Southwest Alaska William F. Manley, Leanne R. Lestak, and Eric G. Parrish INSTAAR, University of Colorado

  2. Introduction This powerpoint presentation is a visual overview of high-resolution orthorectified imagery that is now available for the coastal and nearshore areas of three target areas within Lake Clark National Park and Preserve (LACL): Glacier Spit, Silver Salmon, and Tuxedni Bay. The imagery was completed as part of a pilot study by the University of Colorado in collaboration with the Southwest Alaska Network Inventory and Monitoring Program. Beyond analysis of coastal change, the imagery will be of interest to land managers, scientists, and others for observation and study of natural features and ecosystems.

  3. Orthorectified Aerial Photography ca. 1950 1978 1993 2004-2006 IKONOS (available separately)

  4. Goals The three, co-registered “timeslices” of imagery complement recent IKONOS acquisitions, and greatly improve the resolution, accuracy, and temporal extent of the previously georectified LACL coastal atlas. The imagery will be helpful for a broad range of studies, and to detect change in: • cultural resources and archeological sites • ecosystem components such as coastal zones, wetlands, geology, soils, lake & stream hydrology, and vegetation assemblages • marine, terrestrial, and freshwater habitats for a variety of animals The imagery assists the goals of the Southwest Alaska Network for inventory and monitoring of natural resources.

  5. Study Area • coastal LACL • three target areas with importance for resource management and other I&M studies

  6. 1954-1957 • 5 frames • Black and White • 1:43,000 • 60 cm resolution • 15.5 m accuracy

  7. 1978 • 3 frames • Color IR • 1:65,000 • 1.0 m resolution • 17.3 m accuracy

  8. 1993 • 8 frames • Black and White • 1:24,000 • 30 cm resolution • 7.2 m accuracy • low tide (~MLLW)

  9. Glacier Spit1957 tidal channel dynamics wetland changes forest expansion beach accretion

  10. Glacier Spit1978 tidal channel dynamics wetland changes forest expansion beach accretion

  11. Glacier Spit1993 tidal channel dynamics wetland changes forest expansion beach accretion

  12. Glacier Spit2004 (IKONOS) tidal channel dynamics wetland changes forest expansion beach accretion

  13. Silver Salmon1957 wetland changes tidal channel dynamics forest expansion coastal erosion

  14. Silver Salmon1978 wetland changes tidal channel dynamics forest expansion coastal erosion

  15. Silver Salmon1993 wetland changes tidal channel dynamics forest expansion coastal erosion

  16. Silver Salmon2004 (IKONOS) wetland changes tidal channel dynamics forest expansion coastal erosion

  17. Tuxedni Bay1954 intertidal flat

  18. Tuxedni Bay1978 expansion of wetland vegetation after uplift of 1964 earthquake

  19. Tuxedni Bay1993 wetland changes

  20. Tuxedni Bay2006 (IKONOS) wetland changes

  21. Tuxedni Bay1978(Perspective views are also possible)

  22. Methods • Each frame fully orthorectified to the IKONOS reference imagery. • Procedure after extensive testing: • ERDAS Imagine, with: • air photo camera models • IKONOS stereo Digital Terrain Model • available camera calibration information • image-to-image control points spread across frame • Horizontal accuracy for each frame then quantified with independent check points. • Errors can be reduced further for small areas.

  23. Comparison at Glacier Spit Previously Georectified Coastal Atlas This Data Release • 2 m resolution • 260 m accuracy • 30 cm resolution • 3.4 m accuracy

  24. Available to the Public: • readme file • orthoimagery for 1993, 1978, and ca. 1950 • index map layers • FGDC metadata • on 2 DVD’s Contact: Southwest Alaska Network Data Manager National Park Service Southwest Alaska Inventory and Monitoring Program 240 West 5th Avenue Anchorage, AK 99501 907-644-3684 Dorothy_Mortenson@nps.gov

  25. Questions?: Southwest Alaska Network Data Manager National Park Service Southwest Alaska Network Inventory and Monitoring Program 240 West 5th Avenue Anchorage, AK 99501 907-644-3684 Dorothy_Mortenson@nps.gov or William Manley, PhD Institute of Arctic and Alpine Research (INSTAAR) University of Colorado 1560 30th Street Boulder, CO 80309-0450 303-735-1300 William.Manley@colorado.edu

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