Download presentation
Presentation is loading. Please wait.
Published byMarilynn Wilkinson Modified over 9 years ago
1
GeoTools 2009 Conference A Process For Mapping Shorelines and Intertidal Zones With Multitemporal LANDSAT 7 Images Process input: a series of LANDSAT images; E.g., 20 images over a 2 year span Process output: Water cover map and shorelines with 15 m resolution. Water cover time is color coded as 5% (dark red) to 100% (dark blue).
2
Processing Algorithm Denoise Radiometric scaling (Pan band) Subpixel registration Multitemporal set of LANDSAT bands 4,5, & 8 Reference image Coarse resolution water cover based on NIR & SWIR Coarse shorelines Refined radiometric scaling for Pan band Max/min water cover based on MWIR Pan sharpened shorelines Water cover map and shorelines
3
Benefits of LANDSAT 7 relative to other satellites LANDSAT has the most revisits in archive. Worldwide 16- day revisits since 1999 *. This is essential to any sort of multitemporal analysis. LANDSAT’s eight spectral bands includes the three most suitable for mapping water bodies - SW, MW, and Thermal IR bands And since late 2008 the entire inventory of LANDSAT imagery has been made available free with electronic downloads. This makes multitemporal analysis affordable. * In archived data the revisit time is variable, average ~1/month; LANDSAT 5 images also available, going back to 1984.
4
Comparison of various satellites LANDSATSPOT 4QuickBird 2 Number of archived images 1999-2008 21221 IR bands for mapping water area NIR, SWIR, MWIR, and TIR NIR & SWIRNIR Resolution (with pan-sharpening) 15 m10 m0.5 m Imagery cost per km 2 $0>$1>$20 Total cost for 20 images $0>$8,000>$160,000 For a hypothetical project requiring 20 Pan+MSI images over 10-year span, 400 km 2 area centered on El Golfo De Santa Clara (31.98N,114.95W)
5
Mouth of the Colorado River at the North end of Gulf of California. Part time aquatic farm activity Bathymetry in the intertidal zone
6
Process runs on a dedicated server Access to the server is free. Instructions for logging on can be found at jOmegak.com/jCube/. Contact: Ron Abileah abileah@jOmegak.com User logs on the server j k server Images are downloaded directly from USGS portal to the j k server USGS LANDSAT portal Remote user
7
2 km wide intertidal zone, tidal rivers Part of the shoreline in North Gulf of California semi-dry lake
8
Vicinity of the San Mateo Bridge (San Francisco Bay) Protected wetlands covered with water approximately 30% of the time.
9
4 images from 2000 and 4 from 2008 were combined to show the 8-year change (green) in the Dead Sea shoreline
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.