Skip common site navigation and headers
United States Environmental Protection Agency
Exposure Research
Begin Hierarchical Links EPA Home > Research & Development > Exposure Research > Publications/Presentations > End Hierarchical Links

 

Accounting for Error Propagation in the Development of a Leaf Area Index (Lai) Reference Map to Assess the Modis Lai Modi5a Lai Product

spacer
spacer
Abstract:The ability to effectively use remotely sensed data for environmental spatial analysis is dependent on understanding the underlying procedures and associated variances attributed to the data processing and image analysis technique. Equally important, also, is understanding the error associated with the given reference data used to assess the accuracy of the image product. This paper details measurement variance accumulated in the development of a leaf area index (LAI) reference map used to assess the accuracy of the Moderate Resolution Imaging Spectroradiometer (MODIS) MOD15A LAI 1000-m product in the southeastern United States.

MODIS LAI was compared with reference data derived from Landsat Enhanced Thematic Mapper (ETM+) during the 2002 field season in the Albemarle-Pamlico Basin in Virginia and North Carolina. Ground-based optical LAI estimates were correlated with various ETM+ derived vegetation indices (VI's) at a 30-m resolution pixel. These 30-m pixels were scaled up to the 1000-m MODIS LAI pixel resolution and averaged to give one LAI value. A detailed listing of error propagation for this reference data set includes uncertainty associated with: (1) two integrated optical LAI field estimating techniques (Tracing Radiation and Architecture of Canopies, TRAC instrument, and hemispherical photography), (2) choice of site-specific VI's, and (3) image-to-image registration.
spacer
Citation:Iiames, J., D. Pilant, T. E. Lewis, and R. O. Congalton. Accounting for Error Propagation in the Development of a Leaf Area Index (Lai) Reference Map to Assess the Modis Lai Modi5a Lai Product. Presented at TIES and the Spatial Accuracy Symposium, Portland, MN, June 28-July 1, 2004.
spacer
spacer
Contact: Chris Siebert - (702) 798-2234 or siebert.christopher@epa.gov
spacer
Division: Environmental Sciences Division
spacer
Branch: Landscape Characterization Branch (RTP)
spacer
Product Type: Abstrct/Oral
spacer
Presented: 06/28/2004
spacer
Related Entries:
spacer
Bullet Item Landscape Characterization and Change Detection Methods Development Research (2005-2007)
spacer Relationship Reason:   A Project of the Product
spacer
spacer
spacer

 

ORD Home | Search EPA | Search NERL | Search EIMS | Contacts | Help

 
Begin Site Footer

EPA Home | Privacy and Security Notice | Contact Us

Last Updated on Monday, October 22, 2007
URL: http://cfpub.epa.gov