نتایج جستجو برای: forest vegetation

تعداد نتایج: 144457  

2008
Vishal K. Mehta Patrick J. Sullivan M. Todd Walter Jagdish Krishnaswamy Stephen D. DeGloria

Indian forests provide a multitude of services to vast populations. Common human activities including livestock grazing, fuelwood extraction and burning have the potential to impact forest ecosystem structure and function. The effects of these activities on vegetation, ecology and soil properties were investigated in Bandipur National Park (BNP) in southern India. Data were collected from 200 s...

Journal: :Remote Sensing 2017
Jake E. Simpson Thomas E. L. Smith Martin J. Wooster

Airborne Light Detection and Ranging (LiDAR) is a survey tool with many applications in forestry and forest research. It can capture the 3D structure of vegetation and topography quickly and accurately over thousands of hectares of forest. However, very few studies have assessed how accurately LiDAR can measure surface topography under forest canopies, which may be important, for example, in re...

2002
George Xian Zhiliang Zhu

Accurate, current, and cost-effective fire fuel data are required by management and fire science communities for use in reducing wildland fire hazards over large areas. In this paper we present results of applying decision-tree techniques to mapping vegetation parameters (such as vegetation types and canopy structure classification) required for fire fuel characterization. Specifically, we pres...

Journal: :caspian journal of environmental sciences 2011
h. pourbabaei r. abedi

the objective of this research was to identify and describe the different ecological species groups (vegetation types) present in the rural heritage museum of guilan. the study area was approximately 260 ha, which is located in the saravan forest park in guilan province, north of iran. sampling procedure was performed with a systematic random technique. a total of 89 plots were sampled. classif...

2017
Thuan Chu Xulin Guo Kazuo Takeda Warren B. Cohen

Post-fire forest regeneration is strongly influenced by abiotic and biotic heterogeneity in the preand post-fire environments, including fire regimes, species characteristics, landforms, hydrology, regional climate, and soil properties. Assessing these drivers is key to understanding the long-term effects of fire disturbances on forest succession. We evaluated multiple factors influencing patte...

2006
C. Simpson

Information on the structural complexity of forest stands is required to inform conservation priorities that guide the sustainable management of private native vegetation for multiple objectives of landowners. Whilst research into methods for the operational mapping of vegetation structure is expanding, the research is largely exploratory, and no methods have yet seen widespread acceptance. Thi...

2001
T. SCOTT RUPP ANTHONY M. STARFIELD

The response of terrestrial ecosystems to climate warming has important implications to potential feedbacks to climate. The interactions between topography, climate, and disturbance could alter recruitment patterns to reduce or offset current predicted positive feedbacks to warming at high latitudes. In northern Alaska the Brooks Range poses a complex environmental and ecological barrier to spe...

Journal: :Remote Sensing 2016
Qiang Wang Yong Pang Zengyuan Li Guoqing Sun Erxue Chen Wenge Ni-Meister

Multi-angle remote sensing can either be regarded as an added source of uncertainty for variable retrieval, or as a source of additional information, which enhances variable retrieval compared to traditional single-angle observation. However, the magnitude of these angular and band effects for forest structure parameters is difficult to quantify. We used the Discrete Anisotropic Radiative Trans...

2004
Jane R. Foster Philip A. Townsend

—Hyperspectral imagery from EO-1 Hyperion and AVIRIS were used in conjunction with continuous forest inventory (CFI) data to map detailed forest composition in the state forests of Western Maryland. We developed a hierarchical vegetation classification that conformed to the National Vegetation Classification Standard (NVCS) at the Alliance level and mapped these forest types as a function of hy...

2004
Jan KUÇERA Yoshifumi YASUOKA

This paper describes the creation of a forest fire history database for part of the Far East region of Asia using remotely sensed data, Advanced Very High Resolution Radiometer (AVHRR). The algorithm for burnt scar mapping utilizes an active fire detection technique together with detection of abrupt vegetation damage depicted by time series of the Normalized Difference Vegetation Index (NDVI). ...

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