نتایج جستجو برای: including vegetation indices

تعداد نتایج: 1085008  

2013
Kendra E. Kaiser Brian L. McGlynn Ryan E. Emanuel

Vegetation pattern and landscape structure intersect to exert strong control over ecohydrological dynamics at the watershed scale. The hydrologic implications of vegetation disturbance (e.g. fire, disease) depend on the spatial pattern and form of environmental change. Here, we investigate this intersection at Tenderfoot Creek Experimental Forest (TCEF), Montana, with a focus on the mountain pi...

Journal: :Remote Sensing 2015
Per Skougaard Kaspersen Rasmus Fensholt Martin Drews

Impervious surfaces (IS) are a key indicator of environmental quality, and mapping of urban IS is important for a wide range of applications including hydrological modelling, water management, urban and environmental planning and urban climate studies. This paper addresses the accuracy and applicability of vegetation indices (VI), from Landsat imagery, to estimate IS fractions for European citi...

2016
Margarita Huesca Mariano García Keely L. Roth Angeles Casas Susan L. Ustin

Article history: Received 23 July 2015 Received in revised form 15 April 2016 Accepted 28 April 2016 Available online xxxx There is awell-established needwithin the remote sensing community for improved estimation and understanding of canopy structure and its influence on the retrieval of leaf biochemical properties. The main goal of this research was to assess the potential of optical spectral...

2014
Jessica L. O’Connell Kristin B. Byrd Maggi Kelly

Coastal marshes depend on belowground biomass of roots and rhizomes to contribute to peat and soil organic carbon, accrete soil and alleviate flooding as sea level rises. For nutrient-limited plants, eutrophication has either reduced or stimulated belowground biomass depending on plant biomass allocation response to fertilization. Within a freshwater wetland impoundment receiving minimal sedime...

Journal: :Remote Sensing 2012
Hirofumi Hashimoto Weile Wang Cristina Milesi Michael A. White Sangram Ganguly Minoru Gamo Ryuichi Hirata Ranga B. Myneni Ramakrishna R. Nemani

Algorithms that use remotely-sensed vegetation indices to estimate gross primary production (GPP), a key component of the global carbon cycle, have gained a lot of popularity in the past decade. Yet despite the amount of research on the topic, the most appropriate approach is still under debate. As an attempt to address this question, we compared the performance of different vegetation indices ...

Journal: :The American journal of tropical medicine and hygiene 2006
Atiqur Rahman Felix Kogan Leonid Roytman

Epidemiologic data of malaria cases were correlated with satellite-based vegetation health (VH) indices to investigate if they can be used as proxy for monitoring malaria epidemics in Bangladesh. The VH indices were represented by the vegetation condition index (VCI) and the temperature condition index (TCI). The VCI and TCI estimate moisture and thermal conditions, respectively. Sensitivity of...

2016
Miloud Chikr El-Mezouar Nasreddine Taleb Kidiyo Kpalma Joseph Ronsin M. Chikr El-Mezouar N. Taleb K. Kpalma J. Ronsin

In monitoring vegetation change and urban planning, the measure and the mapping of the green vegetation over the Earth play an important role. The normalized difference vegetation index (NDVI) is the most popular approach to generate vegetation maps for remote sensing imagery. Unfortunately, the NDVI generates low-resolution vegetation maps. Highresolution imagery, such as IKONOS imagery, can b...

2011
Sarah Bodbyl-Roels A Townsend Peterson Xiangming Xiao

BACKGROUND Ecological niche modeling integrates known sites of occurrence of species or phenomena with data on environmental variation across landscapes to infer environmental spaces potentially inhabited (i.e., the ecological niche) to generate predictive maps of potential distributions in geographic space. Key inputs to this process include raster data layers characterizing spatial variation ...

2012
Allen Hope Ryan Bart

A flow duration curve (FDC) provides a valuable planning and management tool since it describes the entire flow regime of a river. Water resource planning in South Africa is often based on monthly river flow data and synthetic FDCs are required for applications in ungauged catchments. The objective of this study was to derive 11 monthly FDC percentile flows and the mean annual flow (MAQ) for ca...

Journal: :Remote Sensing 2016
Siheng Wang Changping Huang Lifu Zhang Yi Lin Yi Cen Taixia Wu

We examined the relationship between satellite measurements of solar-induced chlorophyll fluorescence (SIF) and several meteorological drought indices, including the multi-time-scale standard precipitation index (SPI) and the Palmer drought severity index (PDSI), to evaluate the potential of using SIF to monitor and assess drought. We found significant positive relationships between SIF and dro...

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