Mapping saltcedar (tamarix ramosissima) and other riparian and agricultural vegetation in the lower colorado river region using multi-spectral landsat tm imagery

Balaji B.Maruthi Sridhar, Robert K. Vincenta, Wentworth B. Claphamb, Subramania I. Sritharanc, John Osterbergd, Christopher M.U. Nealee, Doyle R. Wattsf

Research output: Contribution to journalArticlepeer-review

Abstract

Saltcedar (Tamarix ramosissima), an invasive shrub species, has successfully invaded large extents of several riparian zones in the western United States and northern Mexico. Mapping the distribution and abundance of saltcedar over these large areas through a multi-seasonal, cost-effective monitoring approach using satellite remote sensing is very essential. Ground truth surveys were conducted at 79 locations where the spectral reflectance measurements of vegetation, type of plant species, plant heights, soil samples and GPS co-ordinates were recorded. All the sampling was designed to coincide with the satellite overpass period. The Landsat TM colour-composite spectral ratio image (normalized difference vegetative index (NDVI), R1,5 and R1,7 as green, blue and red) can clearly identify and map the areas infested with saltcedar. The Landsat image analysis shows that these spectral ratios can be applied to multiple satellite overpasses for monitoring the seasonal progression of the saltcedar growth over time.

Original languageEnglish (US)
Pages (from-to)649-662
Number of pages14
JournalGeocarto International
Volume25
Issue number8
DOIs
StatePublished - Dec 2010
Externally publishedYes

Keywords

  • Colorado river
  • Invasive plant
  • Landsat
  • Riparian
  • Saltcedar
  • Spectral reflectance

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Water Science and Technology

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