Habitat Fragmentation by Land-Use Change: One-Horned Rhinoceros in Nepal and Red-Cockaded Woodpecker in Texas Page: 30
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On the other hand, wetland, grassland and agriculture were classified with 75% and 50%
accuracy. The reason for low accuracy of grassland category may have resulted from confusion
of agriculture and grass pixels, a typical situation in such studies. The growth stage or the height
of the crops and the grass could have been similar when this image was taken.
The agricultural land contains some of the settlement and grassland pixels. Similarly,
wetland pixels could be confused with other water bodies. The largest wetland area is actually
the outlet of one of the major lake, Tamar Tal (Tamar Lake). It is located closer to the confluence
of the three rivers; and when the lake is inundated during monsoon season, water overflows to
this area. The purpose of the second visit to the field was to confirm vegetation and location of
this area. The fieldwork revealed a secondary succession of grassland in the outlet. While one
side of the outlet was covered with marshy vegetation, the other side flourished with grassland.
The marshy vegetation would eventually convert into grassland that would serve as additional
habitat for the greater one-horned rhinoceros. The area or the lake could have overflowed when
this image was taken in 2003. The spectral profiles of these pixels also exhibit the nature of
vegetation that is submerged in water. New classification routines are needed that can tease apart
detailed reflectance patterns that are essential to distinguish agriculture, grassland, and settlement
pixels. This increases need in field identification of these classes, and the use of higher-
resolution imagery is another promising alternative.
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Thapa, Vivek. Habitat Fragmentation by Land-Use Change: One-Horned Rhinoceros in Nepal and Red-Cockaded Woodpecker in Texas, dissertation, December 2010; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc33207/m1/42/: accessed October 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .