نتایج جستجو برای: tree cover

تعداد نتایج: 275424  

Journal: Desert 2012
F. Mellati H. Arzani H. Azarnivand H.R. Keshtkar S.K. Alavipanah

Land cover is one of basic data layers in geographic information system for physical planning and environmentalmonitoring. Digital image classification is generally performed to produce land cover maps from remote sensing data,particularly for large areas. In the present study the multispectral image from IRS LISS-III image along with ancillary datasuch as vegetation indices, principal componen...

2015
Janne H. Korhonen Pekka Parviainen

Both learning and inference tasks on Bayesian networks are NP-hard in general. Bounded tree-width Bayesian networks have recently received a lot of attention as a way to circumvent this complexity issue; however, while inference on bounded tree-width networks is tractable, the learning problem remains NP-hard even for tree-width 2. In this paper, we propose bounded vertex cover number Bayesian ...

Journal: :Environmental management 2011
Matthew D Madsen Daniel L Zvirzdin Bracken D Davis Steven L Petersen Bruce A Roundy

Western North America is experiencing a dramatic expansion of piñon (Pinus spp.) and juniper (Juniperus spp.) (P-J) trees into shrub-steppe communities. Feature extracted data acquired from remotely sensed imagery can help managers rapidly and accurately assess this land cover change in order to manage rangeland ecosystems at a landscape-scale. The objectives of this study were to: (1) develop ...

Journal: :Journal of Graph Algorithms and Applications 2017

Journal: :Global Environmental Change 2014

Journal: :J. Discrete Algorithms 2005
Serge Dulucq Hélène Touzet

We study the behavior of dynamic programming methods for the tree edit distance problem, such as [5,13]. We show that those two algorithms may be described as decomposition strategies. We introduce the general framework of cover strategies, and we provide an exact characterization of the complexity of cover strategies. This analysis allows us to define a new tree edit distance algorithm, that i...

2008
Tim Whiteside Waqar Ahmad

Very high spatial resolution satellite imagery provides data that enables spatially detailed analysis of landscapes. The identification and extraction of information about tree crowns is one such use. Tree crown or canopy cover is one parameter of vegetation structural classification. The estimation of canopy cover has a wide range if uses related to management and policies. Tree crown extracti...

Journal: :Journal of Graph Algorithms and Applications 2011

Journal: :Proceedings of the Royal Society B: Biological Sciences 2017

2011
Paul A. Knapp

Interpretation of large-scale color infrared and color aerial photography can be a laborand cost-effective means to make inventory of and monitor rangelands while maintaining accuracy. Ground measurements of total vegetation cover, tree, shrub and cacti cover at Organ Pipe Cactus National Monument were taken in 1975 and 1984. Estimates of ground vegetation cover made using large scale (1:1200) ...

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