News Column

Study Results from University of Idaho Update Understanding of Photogrammetric Engineering

February 19, 2014

By a News Reporter-Staff News Editor at Journal of Engineering -- A new study on Photogrammetric Engineering is now available. According to news reporting originating from Moscow, Idaho, by VerticalNews correspondents, research stated, "Land managers need to rapidly assess vegetation composition and bare ground to effectively evaluate and manage shrub steppe communities that have been encroached by pinyon and juniper trees. We used an object-based image analysis (OBIA) approach to estimate land cover classes found in pinyon-juniper woodlands, and evaluated the relationship between ground measurements and OBIA land cover measurements."

Our news editors obtained a quote from the research from the University of Idaho, "We acquired high-spatial resolution color-infrared imagery for five sites with a Vexcel UltraCamX digital camera in June 2009. We simultaneously collected ground-based cover measurements within 30 m x 33 m subplots. OBIA mean land cover class differences by site ranged from underestimating litter by 3 percent to overestimating live trees by 1 percent when compared to ground-based measurements. Overall accuracy for thematic maps was 84 percent with a Kappa statistic of 0.80."

According to the news editors, the research concluded: "Although OBIA cover estimates varied slightly from ground cover estimates, methods provide land managers with options for prioritizing management practices and enabling monitoring at an operational scale."

For more information on this research see: Assessing the Relationship between Ground Measurements and Object-Based Image Analysis of Land Cover Classes in Pinyon and Juniper Woodands. Photogrammetric Engineering and Remote Sensing, 2013;79(9):799-808. Photogrammetric Engineering and Remote Sensing can be contacted at: Amer Soc Photogrammetry, 5410 Grosvenor Lane Suite 210, Bethesda, MD 20814-2160, USA.

The news editors report that additional information may be obtained by contacting A. Hulet, University of Idaho, Dept. of Forest Rangeland & Fire Sci, Moscow, ID 83844, United States. Additional authors for this research include B.A. Roundy, S.L. Petersen, R.R. Jensen and S.C. Bunting.

Keywords for this news article include: Idaho, Moscow, United States, North and Central America, Photogrammetric Engineering

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Source: Journal of Engineering

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