نتایج جستجو برای: create general vegetation indices

تعداد نتایج: 961713  

ژورنال: مرتع و آبخیزداری 2012

Assessment process of vegetation cover by remote-sensing images should be based on understanding of the vegetation indices. Vegetation indices are widely used for assessing and monitoring ecological variables such as vegetation cover, above-ground biomass and leaf area index. The aim of the present research was to study of the ASTER data capabilities to estimate the vegetation cover percentage ...

ژورنال: مرتع 2022

Railway construction is one of the important activities in the development of any country and in developing countries, the need for roads is one of the main axes of development. Railway construction operations can effect on desert rangelands around railway. This study investigates the effects of Yazd-Eghlid railway construction on vegetation diversity and richness in  the rangelands of Kalmand-...

2011
Joshi Prem Chandra

Vegetation is one of the most important components of the ecosystems. Knowledge about variations in vegetation species and community distribution patterns, alternations in vegetation phonological (growth) cycles, and modifications in plant physiology and morphology provide a valuable insight in to the climate, geologic and physiographic, characteristics of an area, so mapping vegetation cover i...

To determine the suitable indices for vegetation cover and production assessment based on the remote sensing data, simultaneous digital data with field data belonging to the spring rangeland of the Semirom-Isfahan province were analyzed. During two years of monitoring the annual, grass, forb, and shrub vegetation cover and the total production data from 86 were collected. The Global Positioning...

2009
Adrian V. Rocha Gaius R. Shaver

A two band Enhanced Vegetation Index (EVI2) without the blue band reflectance has recently been developed as a proxy for the phenology, quantity, and activity of vegetation. We compared the ability of EVI2 and the more commonly used Normalized Difference Vegetation Index (NDVI) to resolve differences in surface greenness and Leaf Area Index (LAI) among three sites located along a burn severity ...

Journal: :Remote Sensing 2010
Jerry L. Hatfield John H. Prueger

The paper investigates the value of using distinct vegetation indices to quantify and characterize agricultural crop characteristics at different growth stages. Research was conducted on four crops (corn, soybean, wheat, and canola) over eight years grown under different tillage practices and nitrogen management practices that varied rate and timing. Six different vegetation indices were found ...

2017
Jicai NING Zhiqiang GAO Ran MENG Fuxiang XU Meng GAO

This study analyzed land use and land cover changes and their impact on land surface temperature using Landsat 5 Thematic Mapper and Landsat 8 Operational Land Imager and Thermal Infrared Sensor imagery of the Yellow River Delta. Six Landsat images comprising two time series were used to calculate the land surface temperature and correlated vegetation indices. The Yellow River Delta area has ex...

2014
Jeffrey J. Richardson L. Monika Moskal Jonathan D. Bakker

We developed new vegetation indices utilizing terrestrial laser scanning (TLS) to quantify the three-dimensional spatial configuration of plant communities. These indices leverage the novelty of TLS data and rely on the spatially biased arrangement of a TLS point cloud. We calculated these indices from TLS data acquired within an existing long term manipulation of forest structure in Central Or...

Journal: :journal of rangeland science 2013
habib yazdanshenas mohammad jafari hossein azarnivand hossein arzani malihe nasiri

understanding the plant species diversity could be used as an importantindicator applied for the natural areas management. the aim of this study was toinvestigate the relationships between soil characterizes with distribution and diversity ofplant in vegetation types in karvan district (located in west of isfahan province). for thispurpose, three vegetation types were selected as follows: scari...

Journal: :Remote Sensing 2015
Nasem Badreldin Arturo Sanchez-Azofeifa

Assessing biomass dynamics is highly critical for monitoring ecosystem balance and its response to climate change and anthropogenic activities. In this study, we introduced a direct link between Landsat vegetation spectral indices and ground/airborne LiDAR data; this integration was established to estimate the biomass dynamics over various years using multi-temporal Landsat satellite images. Ou...

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