Vegetation Mapping For Change Detection On An Arid-Zone River

Publisher:
Springer
Publication Type:
Journal Article
Citation:
Environmental Monitoring and Assessment, 2005, 109 (1-3), pp. 255 - 274
Issue Date:
2005-01
Full metadata record
Files in This Item:
Filename Description Size
Thumbnail2009001567OK.pdf733.46 kB
Adobe PDF
A vegetation mapping system for change detection was tested at the Havasu National Wildlife Refuge (HNWR) on the Lower Colorado River. A low-cost, aerial photomosaic of the 4200 ha, study area was constructed utilizing an automated digital camera system, supplemented with oblique photographs to aid in determining species composition and plant heights. Ground-truth plots showed high accuracy in distinguishing native cottonwood (Populus fremontii) and willow (Salix gooddingii) trees from other vegetation on aerial photos. Marsh vegetation (mainly cattails, Typha domengensis) was also easily identified. However, shrubby terrestrial vegetation, consisting of saltcedar (Tamarix ramosissima), arrowweed (Pluchea sericea), and mesquite trees (Prosopis spp.), could not be accurately distinguished from each other and were combined into a single shrub layer on the final vegetation map. The final map took the form of a base, shrub and marsh layer, which was displayed as a Normalized Difference Vegetation Index map from a Landsat Enhanced Thematic Mapper (ETM+) image to show vegetation intensity.
Please use this identifier to cite or link to this item: