Comparison of IKONOS Derived Vegetation Index and LiDAR Derived Canopy Height Model for Grassland Management. Page: 20
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junipers along the edge of forests contribute to expansion into grasslands, and are more readily
managed, they were included into a separate class. The grassland class is very important in that
it allows a calculation of juniper biomass per hectare of grassland for comparison purposes
between management units. Juniper biomass, normalized by grassland within each unit was used
to suggest the order in which control measures should be implemented. The urban and water
classes were created to increase the area estimation accuracy. Another method would have been
to add these features to a "non-classified" category, but the urban and water classes added to the
overall quality and aesthetics of the image classification results.
It should be noted that although ancillary thematic layers can be used in eCognition to
supplement the process, in this study they were not used for several reasons. Following
information by Forest Service personnel and aerial photography, manual techniques were used to
classify the southern pine tree stands (originally planned for erosion control) on the imagery. In
addition, it was determined that although live oaks are typically found growing within specific
soils types, the soils data was not of high enough resolution to produce a correlation with the
live oak location. However, after field visits it was decided that live oak did not occur to the
extent that it would negatively affect the study. Although it is possible that some live oaks were
classified as juniper, particularly in fringe areas, local knowledge of the National Forest Service
(NFS) personnel could take this into account when using the results for management purposes.
Nevertheless, the potential for classification error should be noted.
The final stage within the classification was to import the classification into ArcGIS as a
shapefile and clip it to each management unit. The polygons within the eight classes where
dissolved so that total area could be calculated on a per management unit bases. These area
calculations were then used in conjunction with the biomass information to provide further20
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Parker, Gary. Comparison of IKONOS Derived Vegetation Index and LiDAR Derived Canopy Height Model for Grassland Management., thesis, December 2009; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc12179/m1/27/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .