Discussion Questions (Week 9)

 

Levin, N; Bendor, E; Karnieli, A. 2004. Topographic Information of Sand Dunes as Extracted from Shading Effects Using Landsat Images. Remote Sensing of Environment 90(2): 190-209.

 

  1. What are examples of ways, prior to this study, that variation in reflection was used to extract information?

 

  1. What factors influence vegetation cover on sand dunes?

 

  1. What factors influence reflectance spectra of sand dunes?

 

  1. What are the three sources of illumination on a slope?

 

  1. What factors affect shading on dunes?

 

  1. Why is biogenic soil crust so problematic for determining sand dune height?

 

  1. Why does ASTER DEM data yield poor results for dune height compared to the authors’ method?

 

Sun G, Ranson K.J; Kharuk V.I. 2002. Radiometric Slope Correction for Forest Biomass Estimation from SAR Data in the Western Sayani Mountains, Siberia.  Remote Sensing of Environment 79(2-3): 279-287.

 

  1.  

 

Shepherd JD, Dymond JR 2003. Correcting satellite imagery for the varianace of reflectance and illumination with topography. INTERNATIONAL JOURNAL OF REMOTE SENSING 24 (17): 3503-3514.

 

  1. There are three terms in equation (1). Explain each term.

 

  1. Equation (5) can be simplified for a sensor like Landsat. How and why?