Spectral reflectance of hydrophytes

Best, Robert G.; Wehde, M. E.; Linder, Raymond L.

doi:10.1016/0034-4257(81)90004-3

Cited by 29 publications

(17 citation statements)

References 1 publication

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“…Vaiphasa et al 2005Vaiphasa et al , 2007 and field reflectance at canopy scale (e.g. Best et al 1981;Penuelas et al 1993b;Schmidt and Skidmore 2003;Rosso et al 2005).…”

Section: Improving the Accuracy Of Wetland Vegetation Classificationmentioning

confidence: 99%

Multispectral and hyperspectral remote sensing for identification and mapping of wetland vegetation: a review

Adam

Mutanga

Rugege

2009

Wetlands Ecol Manage

790

484

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Wetland vegetation plays a key role in the ecological functions of wetland environments. Remote sensing techniques offer timely, up-to-date, and relatively accurate information for sustainable and effective management of wetland vegetation. This article provides an overview on the status of remote sensing applications in discriminating and mapping wetland vegetation, and estimating some of the biochemical and biophysical parameters of wetland vegetation. Research needs for successful applications of remote sensing in wetland vegetation mapping and the major challenges are also discussed. The review focuses on providing fundamental information relating to the spectral characteristics of wetland vegetation, discriminating wetland vegetation using broad-and narrow-bands, as well as estimating water content, biomass, and leaf area index. It can be concluded that the remote sensing of wetland vegetation has some particular challenges that require careful consideration in order to obtain successful results. These include an in-depth understanding of the factors affecting the interaction between electromagnetic radiation and wetland vegetation in a particular environment, selecting appropriate spatial and spectral resolution as well as suitable processing techniques for extracting spectral information of wetland vegetation.

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“…Vaiphasa et al 2005Vaiphasa et al , 2007 and field reflectance at canopy scale (e.g. Best et al 1981;Penuelas et al 1993b;Schmidt and Skidmore 2003;Rosso et al 2005).…”

Section: Improving the Accuracy Of Wetland Vegetation Classificationmentioning

confidence: 99%

Multispectral and hyperspectral remote sensing for identification and mapping of wetland vegetation: a review

Adam

Mutanga

Rugege

2009

Wetlands Ecol Manage

790

484

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“…Leaves of young shoots contain 18% crude protein and are grazed by livestock (Best et al 1981). Reeds also provide habitat for wild fowl (Brix 1999).…”

Section: Economic Importancementioning

confidence: 99%

“…Infrared photography has been used to characterize vast stands of reeds. Color differences can not only be used to distinguish P. australis from emergent populations of other species, but also in differentiating the different subtypes within P. australis (Best et al 1981). The rate of increase in biomass differs on the basis of history of colonization by P. australis.…”

Section: Population Dynamicsmentioning

confidence: 99%

The biology of Canadian weeds. 129. Phragmites australis (Cav.) Trin. ex Steud.

Mal¹,

Narine²

2004

Can. J. Plant Sci.

100

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-common reed, is a perennial, emergent aquatic plant with annual cane-like stems developed from an extensive rhizome system. It grows in low-lying wet areas such as fresh and salt-water marshes, drainage ditches, shallow lake edges, sandy banks, roadsides, woodlands and rocky places. Stems can reach up to 6.0 m in height, vary in diameter from 4 to10 mm and have 10 to 25 cm long hollow internodes. Clones are extended by perennial rhizomes with extensive aerenchymatous tissue that supplies oxygen. Roots develop from rhizomes and other submerged parts of shoots. Leaves are smooth, alternate with narrow-lanceolate laminae, 20 to 70 cm long and 1 to 5 cm broad, and tapering to long slender points. The inflorescence is a terminal panicle, often 30 cm long, dull purple to yellow, with main branches bearing many spikelets. Seed production and germination are extremely variable and comparatively rare in many populations. Phragmites australis carries out photosynthesis through the C 3 pathway (or a variation thereof). Studies of genetic variation through isozyme and other molecular methods suggest that the populations are very closely related, and that variation in the metapopulation is small. Chloroplast DNA sequences of two non-coding regions indicate that non-native introduced genotypes of P. australis have displaced native genotypes in parts of North America. Phragmites australis often forms extensive monocultures in North America. As a consequence, habitat quality and species diversity have been documented to decline. However, in roadside populations it is effective in taking up many typical heavy metals that originate from nearby highways and buildings. Phragmites australis is found in all Canadian provinces and the Northwest Territories, but not in the Yukon Territory or Nunavut. The infestation of P. australis is most severe in the Great Lakes region and its migration is primarily mediated through rivers, canals and waterways but roadways are increasingly becoming important. Changes in the water regime have been linked to its success and could ultimately result in changes to the floristic composition of a habitat. Rodeo™, an aqueous solution of the isopropylamine salt of glyphosate, is most frequently used to control P. australis populations. Other methods of control include cutting, burning, and drainage of the species' habitat. As P. australis is considered to be invasive in North America, introduction of biological control agents is now being investigated. Can. J. Plant Sci. 84: 365-396. Le roseau commun Phragmites australis (Cav.) Trin. ex Steud. est une vivace aquatique dont le vaste système de rhizomes donne chaque année des tiges ressemblant à des cannes. L'espèce pousse dans les dépressions humides comme les marais d'eau douce et salants, les fossés de drainage, la rive des lacs peu profonds, les berges sablonneuses, le bord des routes, les boisés et les endroits rocailleux. Les tiges atteignent parfois jusqu'à 6,0 m de hauteur et leur diamètre varie de 4 à 10 mm, avec de longues sections creuses de 10 à ...

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“…Multispectral ground reflectance measurements have also been used to characterize and differentiate among wetland and aquatic plant species. Best et al (1981) studied the multispectral reflectance of 10 wetland and emergent plant species and concluded that there were significantly different visible and near-infrared (NIR) spectra among the species. Everitt et al (1999) reported that the 2 submersed species hydrilla (Hydrilla verticillata) and water stargrass (Heteranthera dubia) could be distinguished in the green (520 to 600 nm), red (630 to 690 nm), and NIR (750 to 900 nm) spectral bands.…”

Section: Remote Sensing and Gis For Aquatic Plant Studiesmentioning

confidence: 99%

Integration of multispectral satellite and hyperspectral field data for aquatic macrophyte studies

John

2014

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Aquatic macrophytes (AM) can serve as useful indicators of water pollution along the littoral zones. The spectral signatures of various AM were investigated to determine whether species could be discriminated by remote sensing. In this study the spectral readings of different AM communities identified were done using the ASD Fieldspec® Hand Held spectro-radiometer in the wavelength range of 325 -1075nm. The collected specific reflectance spectra were applied to space borne multi-spectral remote sensing data from Worldview-2, acquired on 26 th March 2011. The dimensionality reduction of the spectro-radiometric data was done using the technique principal components analysis (PCA). Out of the different PCA axes generated, 93.472 % variance of the spectra was explained by the first axis. The spectral derivative analysis was done to identify the wavelength where the greatest difference in reflectance is shown. The identified wavelengths are 510, 690, 720, 756, 806, 885, 907 and 923 nm. The output of PCA and derivative analysis were applied to Worldview-2 satellite data for spectral subsetting. The unsupervised classification was used to effectively classify the AM species using the different spectral subsets. The accuracy assessment of the results of the unsupervised classification and their comparison were done. The overall accuracy of the result of unsupervised classification using the band combinations Red-Edge, Green, Coastal blue & Red-edge, Yellow, Blue is 100%. The band combinations NIR-1, Green, Coastal blue & NIR-1, Yellow, Blue yielded an accuracy of 82.35%. The existing vegetation indices and new hyper-spectral indices for the different type of AM communities were computed. Overall, results of this study suggest that high spectral and spatial resolution images provide useful information for natural resource managers especially with regard to the location identification and distribution mapping of macrophyte species and their communities.

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Spectral reflectance of hydrophytes

Cited by 29 publications

References 1 publication

Multispectral and hyperspectral remote sensing for identification and mapping of wetland vegetation: a review

Multispectral and hyperspectral remote sensing for identification and mapping of wetland vegetation: a review

The biology of Canadian weeds. 129. Phragmites australis (Cav.) Trin. ex Steud.

Integration of multispectral satellite and hyperspectral field data for aquatic macrophyte studies

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