Abstract
 Improving Polygon Shapes Created with Landsat 7 Gap Filled Imagery Track: Remote Sensing Imagery Author(s): Chris Curlis, David Hansen, Barbara Simpson The U.S. Bureau of Reclamation employs the Central Valley Habitat Monitoring (CVHM) program to monitor changes in habitat within various areas of California's central valley. Landsat 7 ETM+ imagery is the primary data used to generate spectral based polygons and conduct an image differencing based change detection. Unfortunately imagery from Landsat 7 is affected by the Scan Line Corrector (SLC) anomaly and has systematic data gaps. However, the CVHM project uses Landsat 7 SLC-off to SLC-off Gap filled imagery. This allows us to select imagery from nearby dates (± 2 months) to fill in the gaps and create improved resolution polygons to use for change detection and classification. Areas in the imagery which still suffer data gaps are improved using imagery from adjacent scenes along with ArcGIS Model Builder and overlay tools to reduce data loss and improve the geometry of the polygons. Chris Curlis U.S. Bureau of Reclamation Environmental Affairs 2800 Cottage Way Sacramento , CA 95825 US Phone: 916-978-5030 E-mail: ccurlis@mp.usbr.gov David Hansen U.S. Bureau of Reclamation 2800 Cottage Way Sacramento , CA 95825 US Phone: 916-978-5268 Fax: 916-978-5290 E-mail: dhansen@mp.usbr.gov Barbara Simpson U.S. Bureau of Reclamation Environmental Affairs 2800 Cottage Way Sacramento , CA 95825 US Phone: 916 978-5031 Fax: 916 978-5055 E-mail: bsimpson@mp.usbr.gov |
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